1

50cc EXTRA 300 ARF-QB 

(Quick Build) 

ASSEMBLY MANUAL

AEROWORKS 

4903 Nome Street, Denver, CO. 80239 - Phone 303-371-4222 - Fax 303-371-4320 

E-mail - info@aero-works.net 
2

TABLE OF CONTENTS 

 Page

Aeroworks Contact Information ......................................................................... 3 

Introduction ................................................................................................... 4 

Kit Contents................................................................................................... 5 

Items Needed To Complete ................................................................................. 8 

Tightening and Re-shrinking the Covering ........................................................... 9 

UltracoteTM Colors ......................................................................................... 10 

Check Seams and Overlaps for Good Seal ............................................................. 11 

Checking Hinges For Proper Throw ..................................................................... 12 

Wing Assembly................................................................................................ 13

Stab and Elevator Assembly............................................................................... 18 

Rudder and Pull-Pull Cable Assembly .................................................................. 22 

Tail Wheel Installation ...................................................................................... 29 

Main Landing Gear, Gear Cuffs, and Wheel Pants Assembly ...................................... 33 

Engine Installation ........................................................................................... 38 

Canister Installation.......................................................................................... 42 

Tuned Pipe Installation....................................................................................... 46 

Throttle/Choke Servo Installation........................................................................ 50 

Ignition Installation .......................................................................................... 55 

Fuel Tank Assembly and Installation..................................................................... 58 

Radio Installation ............................................................................................. 65 

Cowl Installation ............................................................................................. 68 

Preflight Preparation ........................................................................................ 73 

Decal installation .............................................................................................. 76 

Center of Gravity (C.G.) / Control Throws .............................................................. 80 

Control Throw Deflection Table ........................................................................... 83 
3

4903 Nome Street 

Denver, CO 80239 

Phone: (303) 371-4222 

Fax: (303) 371-4320 

Website: www.aero-works.net

E-mail: Info@aero-works.net

Thank you for choosing the Aeroworks 50cc EXTRA 300 ARF-QB. We put great effort 

into making this plane the best model you will ever build and fly. We have provided you 

with the highest quality kit and performance possible. We wish you great success in the 

assembly and flying of your new Aeroworks 50cc EXTRA 300 ARF-QB. 

!WARNING!

An R/C aircraft is not a toy! If misused, it can cause serious bodily harm and property 

damage. Fly only in open areas, and AMA (Academy of Model Aeronautics) approved 

flying sites. Follow all manufacturer instructions included with your plane, radio, 

servo’s, batteries and engine. 

Aeroworks manufacturing warranties this kit to be free from defects in both material 

and workmanship at the date of purchase. This warranty does not cover any component 

parts damaged by use or modification. In no case shall Aeroworks liability exceed the 

original cost of the purchased kit. Further, Aeroworks reserves the right to change or 

modify this warranty without notice. 

In that Aeroworks has no control over the final assembly or materials used for final assembly, No liability shall be assumed nor accepted for any damage resulting from the 

use by the user of the final user-assembled product. By the act of using the userassembled product, the user accepts all resulting liability. 

We, as the kit manufacturer, have provided you with a top quality, thoroughly tested kit 

and instructions, but ultimately the quality and fly ability of your finished model depends on how you build it; therefore, we cannot in any way guarantee the performance 

of your completed model, and no representations are expresses or implied as to the performance or safety of your completed model. 
4

INTRODUCTION

Your new 50cc EXTRA 300 ARF-QB is a highly aerobatic airplane. It is capable of both precision and 3-D maneuvers. The aircraft builds easily, quickly, and precisely due to its state 

of the art CAD design, LASER cut technology, and high quality included hardware. We hope 

you enjoy building and flying your 50cc EXTRA 300 ARF-QB. 

Great care has been taken in both the design and manufacturing of the 50cc EXTRA 300 

ARF-QB to allow for the strongest and lightest construction possible. Only the highest quality materials from the covering, paint, wood and hardware have been used in the construction 

of this model. 

The 50cc EXTRA 300 ARF-QB has been individually hand built, covered and painted by 

trained and experienced craftsmen with over 25 years of manufacturing experience. Using 

CAD design, laser cut technology and jig-built assures accuracy in all stages of production. 

The 50cc EXTRA 300 ARF-QB is designed for gas engines in the 50cc category. The Desert Aircraft 50cc engine is shown in the assembly instructions. The aircraft was tested with 

the Desert Aircraft 50cc and has outstanding performance. The final choice of engine is left 

up to the builder. A computer radio is recommended to allow the pilot to take advantage of 

the full capabilities of this aerobatic aircraft. 

IMPORTANT Please read through this manual carefully, before starting the assembly of 

your new 50cc EXTRA 300 ARF-QB . Inventory and inspect all parts and hardware for any 

imperfections or damage. Notify Aeroworks immediately if there are missing or damaged parts. 

INTENDED USE

This plane should not be regarded as a toy. This is an aerobatic plane and is recommended for pilots 

who are beyond the trainer-stage and are comfortable with flying an aerobatic sport plane. 

!READ! WARRANTY !READ!

It is important to notify Aeroworks of any damage or problems with the model within 30 

days of receiving your airplane to be covered under warranty. All returned parts must be 

shipped in their original shipping boxes and insured for full replacement value. If you wish to 

return this aircraft for any reason a 15% restock fee will be charged to the customer. In addition the customer is responsible for all return shipping cost and all prior shipping cost will 

not be refunded. Parts will be fixed or replaced once the original item is returned at the 

owner’s expense. It is the decision of Aeroworks if the item is to be replaced or repaired. 

Aeroworks cannot insure the skill of the modeler and can not influence the builder during the 

construction or use of this aircraft, and therefore, will not be accountable for any property 

damage, bodily injury or death caused by this aircraft. 

Aeroworks cannot insure the skill of the modeler and can not influence the builder during the 

construction or use of this aircraft, and therefore, 

The purchaser/operator accepts all responsibility of any and all structural or 

mechanical failures.
5

KIT CONTENTS

50cc Extra 300 ARF-QB

Materials List

Basic Aircraft Parts

Fuselage with pre-installed vertical fin – covered, fire

 wall fuel-proofed, pre-drilled three holes for the 

 tail wheel assembly: 

(4) 8-32 blind nuts installed for main landing gear 

(18) 4-40 blind nuts installed for the mounting of the 

stab(4),Cowling(2) and Belly Pan of fuse(12). 

(1) Engine box top hatch cover with AW logo in 

stalled by (4) T2.6x8mm PWA screws 

(1) Engine box bottom hatch cover with AW logo 

installed by (4) T2.6x8mm PWA screws 

(1) Bottom Long Pipe Hatch installed by (6) 4-

40x14mm hex style bolts and (6) #6 bonded washers 

(1) Bottom Canister Hatch installed by (6) 4-

40x14mm hex style bolts and (6) #6 bonded washers 

(1)Hatch cover for the landing gear installed by (2) 

T2.6x16mm PWA screws 

Canopy base—painted, with (4) 4-40 blind nuts installed 

(1) Tinted Canopy—glued on the canopy base and 

painted, installed on the fuselage by (4) 4-40x16mm 

hex style bolts 

(4) #6 bonded washers for the mounting of the canopy 

(4) 3mm split lock washers for the mounting of the 

canopy 

(1) 3.5(o.d.) x850mm Antenna tube installed 

(2) 3.5(o.d.) x70mm pull-pull exit tube installed 

 (2) Elevator servo string installed 

Left Wing with Aileron – covered: Pre-drilled for the 

mounting of the control horns 

(2)8-32 blind nuts installed for the wing mounting. 

(2)located pins installed pre-drilled hole for cotter 
6

pin 

(6) pin point hinges glued 

(1) Aileron servo string installed 

Right Wing with Aileron – covered: Pre-drilled for the 

mounting of the control horns 

(2) 8-32 blind nuts installed for the wing mounting. 

(2)located pins glued pre-drilled hole for cotter pin 

(6) pin point hinges installed 

(1) Aileron servo string installed 

Horizontal Stabilizer with elevator assembly with (8) 

 pin point hinges (glued)---covered 

 Elevators Pre-drilled for the mounting of the 

 control horns 

Rudder with (5) pin point hinges (not glued) – covered 

 Rudder Pre-drilled for the mounting of the con-

 trol horns 

SUB ASSEMBLIES:

#1: 

 (1) Fiberglass Cowling w/ inside ring glued—painted 

with (2) screws holes at bottom and (2) 6-32 blind nuts 

installed at top 

 (2) 4-40x16mm hex style bolts for mounting cowling 

 (2) #6 bonded washers for mounting cowling 

 (2) 3mm split lock washers for mounting cowling. 

 (2) 6-32x16mm hex head bolts for mounting cowling 

 (2) #6 bonded washers for mounting cowling 

#2: 

 (1) 4mm 7075Aluminum Main Landing Gear -- painted 

 (2) 5x40mm Axle Bolts 

 (2) M8 lock nuts 

 (4) 5mm i.d. Wheel Collars with set-screws 

 (2) 95mm Dia. Main Wheels (Lite Type) 

 (4) 4-40x14mm hex style bolts for mounting wheel 

pants 

 (4) 3mm flat washer for mounting wheel pants 

 (4) 3mm split ring lock washer for mounting wheel 

pants 

 (4) 8-32x20mm hex head bolts for mounting main landing gear 

 (4) 4mm flat washers for mounting main landing gear 

 (4) 4mm split ring lock washers for mounting main 

landing gear. 

 

#3:

 (2)Wheel Pants—1 Left and 1 Right---Painted 

 (4) 4-40 blind nuts installed on the wheel pants, 2 per 

side. 

 

#4:

 (2) Gear Cuffs – 1 Left and 1 Right - Painted 

 (4) 4-40x7mm hex style head bolts for cuffs mounting 

 (4) #6 bonded washers for cuffs mounting 

#5: 

 (1) AW Aluminum Tail Wheel Assembly – Medium 

#6:

 (1) 32mm o.d. Aluminum Tube for wing joint—

Anodized Black 

 (2) 12.5mm o.d. Aluminum Tube for stab joint – one 

front and one rear, Anodized Black 

 (4) 8-32x25mm Hex head bots for wing mounting

 (4) #8 bonded washer for wing mounting 

 (4) 4mm split ring lock washers for wing mounting 

 (4) 4-40x16mm Hex style head bolts for stab mounting 

(4) #6 bonded washer for stab mounting 

(4) 3mm split ring lock washers for stab mounting 

 (4) 1.8mm cotter pins 

#7:

 (2) 4-40 3” Left hand and Right hand threaded pushrods 

with nuts for ailerons 

 (2) 4-40 2-1/2” Left hand and Right hand threaded pushrods with nuts for elevators 

 (1) Wrench for the left hand and right threaded pushrod 

(2) 4-40x300mm Threaded pushrods 

 (2) 4-40 solder coupler with nuts 

 (2) 4-40 Metal clevises 

 (6) brass spacers – 2 for ailerons; 2 for elevators; 1 for 

throttle; 1 for choke 

 (10) 4-40 Ball Link – 4 for ailerons; 4 for elevators; 1 

for throttle; 1 for choke 

 (10) 4-40x16mm hex style bolts 

 (10) 4-40 lock nuts 

 (10) 3mm flat washers 

#8: 

 (2) 1x1100mm plastic coated pull-pull steel cable. 

 (4) 4-40 Metal R/C links with metal clevises and nuts 

 (4) 3.5x5mm brass pull-pull swaging tubes 

 (6) AW double control horns 

 (24) T2.6x16mm Phillips head mounting screws 

 (12) T2.6x12mm Phillips head mounting screws 

 (4) 4-40 Ball Links for rudder servo 

 (4) 4-40x16mm hex style head bolts 

 (4) 4-40 Lock nuts 

 (2) Brass Spacers 

 (4) 3 flat washers 

#9: 

(1)750cc Gas Fuel Tank Assembly –Gas 

 (1) 450cc Gas Fuel Tank Assembly-Smoke 

(1) 4ft. large gas fuel line 

(4) Brass Barbs for fuel line 

 (2) Fuel filler Dot – 1 male and 1 female 

#10:

 (2)Throttle servo mounting trays 

 (1) Canister mounting bracket with Silicon Tubes 

 (1) Long Pipe mounting bracket with Silicon Tubes 

 (3) Engine Mount Temp (DA50, 3W50 & Universal) 

 (2) 8x8x300mm Sponge for the receiver and battery 
7

 (2) 6x70x160mm Foam for the Fuel Tanks 

 (6) 8x450mm Nylon Ties for the fuel tank mounting 

 (10) 3x150mm Small Nylon Ties for the fuel line 

 (4) 356x12.5mm Velcro 

 (1) Card Stock (8”x11”) for making the template for 

cutting of cowling 

(1) Pre-cut (hot air exit) Template for cutting out the 

bottom of the cowl 

(1) Paper Degree Meter for the Rudder 

(1) 12mm Aluminum Insert 

(6) Rubber Grommets – each for 6mm, 8mm 10mm – 

Fuel line and wire guide 

#11:

(24) 6.35mm Aluminum Engine Stand offs. 

#12: 

(1) 300x300mm White Covering 

(1) 300x300mm Cub Yellow Covering 

(1) 300x300mm Pearl Blue Covering 

OR 

(1) 300x300mm White Covering 

(1) 300x300 True Red Covering 

(1) 300x300 Black Covering 

 

 (1) 20x1800mm transparent covering 

#13:

 (1) Custom throw meter 

#14: 

 (1) Manual CD 

#15: 

 (1) Vinyl Decal Set 
8

Hardware:

ITEMS NEEDED TO COMPLETE

• 50cc Gas engine and ignition 

• Standard or Pitts style muffler (Pitts Recommended)

• Engine mount, mounting bolts, lock nuts, and 

flat washers. 

• 3.5” Spinner and propeller of choice 

• 2 x aileron servos (min 180 in./oz. Torque @ 6 

volt, Digital, Metal Geared) 

• 1 x rudder servo (min 180 in./oz. Torque @ 6 

volt, Digital, Metal Geared) 

• 2 x elevator servos (min 180 in./oz. Torque @ 6 

volt, Digital, Metal Geared) 

• 1 x throttle servo (Fast / Reliable) 

• 1 x choke servo (Fast / Reliable) optional

• Servo extensions 4 x 6,” 1 x 12”, 2 x 24” 

• 1 x 6 channel receiver (PCM recommended) 

• 1 x receiver battery (min 6.0 volt / 1700ma) 

• 1 x ignition battery (min 4.8 volt / 1700ma) 

• 2 x switches with charge jacks 

Tools:

• Allen wrenches US and Metric.

• Dremel cutting disc and sanding drum tool

• Electric drill and selection of bits

• Razor saw

• Flat head screwdriver

• Hobby heat gun

• Hobby iron and covering sock

• Masking tape

• Modeling knife

• Needle nose pliers or crimping tool

• Paper towels

• Pen, pencil or felt tipped marker

• Phillips screwdriver

• Rubbing alcohol

• Ruler and tape measure

• Scissors

• T pins

• Waxed paper

• Wire Cutters

Adhesives:

• 15-30 Minute epoxy

• Blue Loctite

• Epoxy mixing cups, mixing sticks, brushes

• CA kicker (optional)

• Thick, Thin and Medium CA 

• Rubbing alcohol 

• Wipes 

WARNING 

Some rubbing alcohols 

may attack painted parts. 
9

1. Open your kit slowly and take care not to damage any parts of the kit. Remove all parts from 

their plastic protective covers for inspection. 

Before doing any assembly or installation of any 

decals it is very important to re-shrink or retighten the already applied covering. Due to the 

shipping process, heat and humidity changes 

from different climates, the covering may become lose and wrinkle in the sun. If you take the 

time to re-tighten the covering, you will be rewarded with a long lasting beautifully covered 

model. 

TIGHTENING AND RE-SHRINKING THE COVERING

2. Using your covering iron with a soft sock, gently 

apply pressure and rub in the covering. If any 

bubbles occur, your iron may be to hot. Reduce 

heat and work slowly. 

3. If bubbles persist, use a small pin to punch holes 

in the bubble to relieve trapped air and reheat. 

4. Use your heat gun with extreme caution. Take 

care not to apply too much heat to one area for 

long periods of time. This may cause the trim 

colors to over shrink and pull away leaving unsightly gaps on the color lines. The trim stripes 

are especially vulnerable to over shrinking. 
10

1. Your model is covered with UltracoteTM covering. 

In case of repairs, the colors are: 

 Yellow/Silver/Blue Scheme 

Pearl Blue #845 

Silver #881 

Cub Yellow #884 

White #870 

UltracoteTM Colors 

2. Red/White/Black Scheme 

Black #866 

Silver #881 

True Red #866 

White #870 
11

1. Go over all seams and color overlaps with your 

sealing iron. 

Note: Even if your models covering has no wrinkles out of the box it is still very important to go 

over all seams and overlaps to make certain they are 

sealed securely. This is especially important at the 

leading edges of the wings and stabs. We recommend checking the covering after each flying session. 

CHECKING SEAMS AND COLOR OVERLAPS FOR GOOD SEAL

2. Use your covering iron to ensure all edges, 

seams, and color overlaps are securely sealed. 

3. This is an optional step but is recommended. 

 

 Cut strips of clear covering to fit the hinge 

gaps. Use covering iron to seal the clear 

covering snugly into the bottom of the 

hinge lines as shown for air tight hinge 

seals. 

Note: Remove clear pro- 

 tective backing 

 from film.

IMPORTANT: 

It is the responsibility of the purchaser /

operator to check the covering seams and 

overlaps for security and a good seal. 

Aeroworks is not responsible for failure of 

covering seams or overlaps during flight. 

Note: If covering continues to lift apply a small 

amount of thin CA underneath the covering. 

Then using a clean rag apply pressure to secure. 

One of the most important tools in your 

flight box is a roll of clear tape. This can be 

used at the field for fast and easy repairs of 

the covering. Then once you have finished 

flying the covering can be permanently 

repaired.
12

CHECKING HINGES FOR PROPER THROW 

2. Evenly heat each hinge along the entire length of 

the wing. This will allow the hinge glue to soften 

and the hinge to move into it proper position. 

Hold the surface at full deflection until the 

hinges have cooled down and the glue has rehardened. 

3. If the elevator hinges are tight follow the 

same process as described for the wings.

Note: Once these steps have been completed 

 the hinges will throw to their full deflect-

 tion. 

IMPORTANT

1. If control surfaces will not throw to full deflection it may be necessary using a heat gun to 

apply heat to the knuckle of each hinge. This 

will allow the hinges to move freely. 
13

Aileron Servo Installation

1. The ailerons have been pre-hinged and glued to 

the wing panels and are ready for flight. No 

other steps are necessary for hinging. 

Gather (1) wing panel, (1) aileron servo, (4) servo 

mounting screws, (1) 1 1/4” servo arm , (1) safety 

clip and (1) 6” servo extension as shown below 

for preparation of the servo installation. 

WING ASSEMBLY

2. Layout the servo on the wing to test fit the installation and ensure servo lead is the correct 

length. 

Note: 180 in. oz. digital, metal geared servos are 

recommended. Servo selection can be the difference 

between a great flying model and a model that will 

crash. Always use brand name high quality servos. 

3. Attach the 6” extension to the servo lead and 

secure with Aeroworks Safety Clip. Ensure the 

connectors will not come apart from vibration or 

light tension. 

4. Fasten the pull string from the servo hole to the 

male plug of the servo extension. 

Safety Clips 

Available 

from 

Aeroworks 
14

5. Draw the servo extension through the wing and 

pull through the wing root rib. 

Note: Taping servo lead to the inside of the wing 

panel will help to prevent lead from dropping back 

inside of wing panel 

during transportation 

6. Install servo in servo well with the output arm 

toward the leading edge of the wing. Mark and 

drill location of servo mounting holes. 

7. Install servo with servo mounting screws. 

Pushrod / Control Horn Installation

1. Gather the aileron control linkage parts as shown 

below. (1) 3” pushrod, (2) 4-40 ball link assemblies, (1) brass spacer, (1) flat washer, (1) left 

and (1) right side control horn, and (6) wood 

screws for each wing panel. 

Wing

Leading Edge
15

2. Assemble the pushrod and control horn assembly as shown. The ball link goes between the 

left and right sides of the control horn sides and 

is secured with a nylon lock nut. Start with the 

center hole in the control horn. The ball link 

may be moved up or down for more or less control throw. Brass spacer goes between servo arm 

and ball link 

3. Correct installation of ball link to servo arm 

shown below. 

Note: Flat washer will prevent ball link from 

 coming loose from brass ball. 

4. Place the control horns over the predrilled 

mounting holes. 

5. Use a drop of thick CA glue on each screw to 

prevent screws from loosening due to vibration 

as shown. 

Pushrods have both left and right hand threads. 

This allows for easier fine adjustments during final 

setup. Be sure to thread ball link correctly onto 

pushrod. Ball links are self taping and can be used 

on either ends of the pushrod. Once ball link has 

been threaded only rethread it onto the same direction threads. 
16

6. Securely fasten the control horn to the aileron 

with six wood screws. 

7. Plug servo and battery into the receiver and turn 

radio on. Ensure the servo trim and sub trim is 

centered. Adjust the length of the pushrod so 

that the servo arm is parallel to the aileron hinge 

line and the trailing edge of the aileron is even 

with the trailing edge of the wing in the neutral 

position. 

Note: Control horns have been set at a slight offset 

 to provide full power at full deflection. 

9. Use the opposite end of the adjustment wrench 

to tighten the pushrod jam nuts against the ball 

links. This will prevent the pushrod from turning 

in flight. 

8. Use the supplied adjustment wrench to adjust the 

pushrod as shown below. 
17

10. Ensure the servo does not bind at either end 

point at full deflection. A 1” servo arm is recommended for best results. A 1 1/4” servo arm 

is required for full deflection of the aileron 

bevel. 

 

11. Repeat all the above steps for the other wing. 
18

Elevator Servo Installation 

1. The elevators have been pre-hinged and glued to 

the stabs and are ready for flight. No other steps 

are necessary for hinging. Clear covering has 

been provided for sealing of the hinge gaps if 

desired. 

Gather the stab/elevator assembly, (2) elevator servos, and (2) 24” servo extension.

Note: 24” servo extension will be used to 

 connect servos to receiver during a later 

 step. 

STAB AND ELEVATOR ASSEMBLY

2. Install servo in servo well with the output shaft 

toward the leading edge of the stab. Fish the 

servo lead through the stab and out of the stab 

root rib. 

3. Mark locations of servo mounting holes. Use a 

1/16 bit to drill servo mounting holes. 

4. Install servo with servo mounting screws. 

1. Gather the elevator control linkage parts as 

shown below. There are: 

• (2) 4-40 pushrods 2 1/2” 

• (4) 4-40 ball link assemblies 

• (2) Flat washers

• (2) brass spacer 

• (2) left side control horns 

• (2) right side control horns 

• (1) Adjustment wrench 

• (12) wood screws 

Elevator Control Linkage Installation 
19

2. Assemble the pushrod and control horn assembly as shown. The ball link goes between the 

left and right sides of the control horn sides and 

is secured with a nylon lock nut. Start with the 

center hole in the control horn. The ball link 

may be moved up or down for more or less control throw. Brass spacer goes between servo arm 

and ball link 

3. Correct installation of ball link to servo arm 

shown below. 

Note: Flat washer will prevent ball link from 

 coming loose from brass ball. 

Pushrods have both left and right hand threads. This 

allows for easier fine adjustments during final setup. 

Be sure to thread ball link correctly onto pushrod. 

Ball links are self taping and can be used on either 

ends of the pushrod. Once ball link has been 

threaded only rethread it onto the same direction 

threads. 

4-40 

BOLT 

FLAT 

WASHER 

LOCK NUT 

BRASS 

SPACER 

4. Place the control horns over the predrilled 

mounting holes. 

Note: Control horns have been set at a slight 

 offset to allow for maximum torque at full 

 deflection 

5. Use a drop of thick CA glue on each screw to 

prevent screws from loosening due to vibration 

as shown. 

Note: CA glues have a fast drying time. 

 Remember to work quickly. 
20

6. Mount the control horn using six wood screws. 

7. Plug servo and battery into the receiver and turn 

radio on. Ensure the servo trim and sub trim is 

centered. Adjust the length of the pushrod so 

that the servo arm is parallel to the elevator 

hinge line and the counter balance of the elevator is even with the leading edge of the stab in 

the neutral position. 

8. Use the supplied adjustment wrench to adjust the 

pushrod as shown below. 

9. Use the opposite end of the adjustment wrench 

to tighten the pushrod jam nuts against the ball 

links. This will prevent the pushrod from turning 

in flight. 
21

10. Finished elevator servo installation shown below. 

Repeat steps for other stab/elevator assembly 
22

Rudder Installation

1. Gather the rudder, five hinges, rubbing alcohol, 

petroleum jelly and epoxy materials as shown. 

Use 15-30 minute epoxy to ensure adequate 

working and cleanup time. 

RUDDER AND PULL – PULL CABLE ASSEMBLY

2. Prep all hinges for installation by applying Vaseline petroleum jelly or light oil to the hinge joint. 

This ensures no epoxy gets into the hinge during 

assembly. 

3. Mix epoxy in mixing cup and use a tapered stick 

to apply the epoxy inside the pre-drilled holes in 

the trailing edge of the fin. Apply epoxy to one 

side of each hinge and insert the hinge completely into the hole. Ensure the hinge axis is 

vertical and parallel to the trailing edge of the fin 

before epoxy cures. Wipe away excess epoxy 

with alcohol wetted wipes. 

4. Epoxy the hinges into the fin first and allow epoxy to fully cure. 
23

5. Mix epoxy in mixing cup and use a tapered stick 

to apply the epoxy inside the pre-drilled holes in 

the leading edge of the rudder. Apply epoxy to 

trailing edge of each hinge. 

6. Carefully slide the rudder onto each hinge and 

against the trailing edge of the fin. Wipe away 

excess epoxy with alcohol wetted wipes. 

7. Ensure there is no gap between fin and rudder. 

Allow epoxy to fully cure. Check you have full 

rudder deflection before epoxy fully cures. 

Note: Use clear covering for sealing the hinge 

 gaps. This is an optional step but is 

 recommended 

Rudder Horn, Pull-Pull Cable and 

Servo Installation

1. Gather the rudder control linkage parts shown 

below. (2) rudder cables, (4) ball link assemblies, (2) flat washers, (4) threaded couplers with 

lock nut, (4) brass swaging tubes, (2) left and 

(2) right side control horns, and (12) wood 

screws. 
24

2. Gather the rudder control horn parts as shown 

below. (2) ball link assemblies, (2) left and (2) 

right side control horns. Assemble the ball links 

between the control horns as shown. Secure 

with nylon lock nut. Start with the center hole in 

the control horn. The ball link may be moved up 

or down for more or less control throw. 

3. Thread brass coupler half way into ball link. 

Note: There are two types of 4-40 couplers supplied, 

 (2) are for the throttle and chock pushrods and 

 (4) are for the pull pull system. The ones with 

the hole in the base are for 

the throttle and choke. 

4. Place the control horns over the predrilled 

mounting holes. 

5. Use a drop of thick CA glue on each screw as 

shown. 
25

6. Mount rudder control horns using six wood 

screws. 

7. Repeat the above steps for mounting the other 

side rudder control horn. 

8. Gather (1) rudder servo, (4) mounting screws 

and (1) 2 3/4” double output arm as shown below. 

Note: 180 in. oz. digital, metal geared servo is 

 recommended. Servo selection can be the 

 difference between a great flying model and a 

 model that will crash. Always use brand name 

9. Install the rudder servo in the servo cutout with 

the output shaft to the front. 

Note: Remove balsa stick holding the elevator pull 

 strings at this time. Secure the pull strings with 

 tape until the elevator extensions are installed. FRONT 

10. Feed one rudder cable through the pre installed 

cable exit tube in the rear of the fuse toward the 

front of the fuse. Repeat for other side. 

Note: Loop or tape cable to fuse to prevent cable 

from being pulled into 

fuse 
26

11. Pull the rudder cables from rear of fuse to the 

rudder servo tray. 

Note: Cables run parallel down fuse and do not 

 cross each other. 

12. Using an X-ACTO knife clean away any burrs 

from brass swags. This will allow the rudder 

cable to pass through brass swage easily. 

13. Thread cable through brass swage tube. 

14. Thread cable through the threaded coupler hole, 

and back through the brass swage tube as shown. 
27

15. Loop the cable back through the brass swage 

tube and pull tight. 

16. Crimp the brass swage tube with a crimping tool 

or pliers. 

17. Cut off excess cable as shown 

18. A drop of thin CA may be applied to the swage 

tube to help secure the cable. 
28

19. Attach ball links to the rudder servo arm and 

then attach the servo arm to the rudder servo as 

shown. 

Note: Use flat washers to prevent link from 

 coming loose from the brass ball 

20. Plug the rudder servo into the rudder channel of 

the receiver and power up. Turn on transmitter 

to center rudder servo. Ensure servo trim and 

sub trims are centered. 

Note: On metal geared servos use blue Loctite for 

 all Servo arm mounting screws. 

21. Tape the rudder balance tab to the top leading 

edge of the vertical fin in the neutral position as 

shown. This ensures the rudder is straight when 

the cables are attached. 

22. Attach the ball link to the rudder control horn as 

shown below. Follow the same steps as shown in 

the previous pages to install the ball link to the 

pull pull cable. 
29

23. Follow the same steps for the opposite side of 

the rudder as shown below. Rudder pull pull assembly is now complete. 

Tail Wheel Installation

1. Gather the tail wheel parts shown below. (1) Tail 

wheel strut, (1) leaf spring, (3) tail wheel 

mounting screws, (1) steering tiller, (2) tiller 

mounting screws, and (2) steering springs. 

2. Align rudder tiller steering arm with pre drilled 

mounting holes at bottom of rudder. 

3. Apply a drop of thick CA to the tiller arm 

mounting screws before inserting in the predrilled holes. 
30

4. Mount the tail wheel steering tiller using two 

wood screws. 

5. Place the tail wheel leaf spring on top of the tail 

wheel strut. Align the tail wheel with pre drilled 

mounting holes on the bottom of the fuse 

6. Place a drop of thick CA on tail wheel strut 

mounting screws before inserting in the predrilled mounting holes on the bottom rear of the 

fuse. 

7. Mount the tail wheel struts using three wood 

screws. 
31

8. Attach the steering spring to the rudder tiller. 

Center the spring between both tail wheel and 

steering tillers. 

9. Use pliers to twist spring end closed around the 

rudder steering tiller. 

10. With spring centered between tiller arms and tail 

wheel centered, bend spring wire through tail 

wheel steering tiller. 

11. Twist spring end tight with pliers. 
32

12. Repeat spring installation for other side. 

13. Bottom view of completed tail wheel installation. 
33

Main Landing Gear Installation

1. Gather the landing gear parts as shown below: 

• (1) Landing Gear Strut 

• (4) 8-32 mounting bolts 

• (4) 4mm flat washers 

• (4) 4mm lock washers 

• (2) Gear Cuffs 

• (4) 4-40 mounting bolts 

• (4) #6 bonded washers 

• (2) Wheel Pants 

• (4) 4-40 mounting bolts 

• (4) 3mm flat washer 

• (4) 3mm lock washer 

• (2) wheels 

• (2) axles assemblies 

• (4) wheel collars 

MAIN LANDING GEAR - GEAR CUFF 

AND WHEEL PANT ASSEMBLY

2. Remove the Phillips head screws holding the 

landing gear cover in place. 

3. Align mounting holes of main landing gear with 

pre drilled mounting holes in fuselage mounting 

plate. 

Note: Mounting holes have been offset to ensure 

 proper installation of main gear. 

4. Assemble the landing gear bolts with lock 

washer and flat washer. Use a drop of blue Loctite on landing gear bolts before attaching the 

landing gear. 

Mounting holes 

have been offset 

to ensure correct 

installation 
34

5. Bolt landing gear strut to fuse with (4) 8-32 bolts 

and washers. Ensure tapered edge of the gear 

strut is facing toward the rear. 

6. Reinstall the landing gear hatch cover. 

7. Gather the landing gear cuffs, mounting bolts 

and bonded washers. 

Note: There is a right and left gear cuff. 

8. Slide the gear cuff onto the proper gear strut. 
35

9. Use the (2) 4-40 mounting bolts and (2) bonded 

washers to secure the gear cuffs to the landing 

gear. 

10. Repeat process for opposite side gear cuff. 

11. Using lock nut install axle to gear. 

Note: Do not tighten securely yet. 

12. Align the flat sides of the axle bolt vertical and 

snug the lock nut against the landing gear strut. 

Note: Do not tighten securely yet. 

13. Align the wheel pant slot over the axle bolt as 

shown. Slide the wheel pant slot over the flat 

sides of the axle bolt and align blind nuts in 

wheel pants with mounting holes in landing 

gear. 

Align axle bolt with 

front of gear 
36

14. Tighten the lock nut against the landing gear 

strut to secure axle. 

15. Install the inner wheel collar on the axle. Use a 

drop of blue Loctite on the wheel collar set 

screw and tighten the wheel collar in place. 

16. Install the wheel and outer wheel collar. Use 

blue Loctite on the wheel collar set screw before 

final tightening. 

17. Final installation of wheel pant with two mounting bolts. 

Note: Make sure wheel turns freely without 

 binding or rubbing against the wheel pant. 

 Adjust wheel collars in or out until wheel turns 

 freely. 
37

18. Repeat above steps for other wheel and wheel 

pant. 

19. Final landing gear installation shown below. 
38

Engine Installation

1. The 50cc Extra 300 will accept a wide range of 

engine types. The DA-50 rear carburetor engine 

with Pitts style muffler, was mounted and used 

for the test flights. 

2. DA 50 with 2 1/2” Stand offs, Pitts style muffler 

and mounting hardware shown below. 

Note: Mounting hardware is Not Supplied. 

 2 1/2” stand offs available through Desert 

 Aircraft. 

Mounting distance from front of firewall to 

front of engine prop hub: 6 5/8” 

ENGINE INSTALLATION

3. Locate the laser cut engine mounting template 

for either the DA-50 or 3W-50. If other engines 

are used the Universal template may be modified 

for any mounting pattern 

4. To modify the universal mounting template to 

accommodate your engine of choice. Line up the 

laser etched thrust lines on the template with the 

engine thrust lines. 
39

5. Mark the location of the engine mounting holes 

on template. 

6. Use a 1/4 drill bit to drill the engine mounting 

holes. Template is now ready for use. 

7. Remove engine box top hatch cover. 

8. Align mounting template with firewall and tape 

in place. 

Note: Use following steps for all types of engine 

 installations.
40

10. Use blue loctite to secure the engine mounting 

bolts in place. This will insure that the mounting 

bolts stay in place over time. 

11. Using mounting bolts and flat fender washers 

mount engine to firewall. Tighten the bolts 

evenly to prevent crushing of the firewall. 

12. Distance from front of firewall to front of 

engine prop hub is 6 5/8”. 

Note: Use aluminum spacers (supplied) and washers 

 (not supplied) to achieve correct distance. 

9. Use a 1/4 bit to drill the engine mounting holes in 

firewall. 

6 5/8” 
41

13. Attach the muffler to the motor at this time. 

Note: Muffler will be removed during cowl installa-

 tion. It may be left off at this time in order to 

 aid in cowl installation. 
42

1. Using a covering iron seal the covering around 

 the air exit holes at fuse bottom as shown be-

 low. 

2. Use a hobby knife to remove the covering 

around the hot air exit holes. 

Note: Take care not to remove the covering from the 

 tuned pipe hatch cover. 

3. Remove the (6) Phillips head screws holding the 

canister hatch in place. 

CANISTER INSTALLATION

Canister Installation 

 Gather the canister muffler parts as shown: 

Shown: (1) KS 86 Canister (Rear Exit) 

 (1) 25mm Drop Double Bend flex header 

 (1) Teflon Coupler 

 (2) Mounting Clamps 

 (1) Canister Mounting Bracket-Supplied 
43

4. Canister mounting bracket location shown below. 

5. Test fit canister mount in the fuse. If necessary 

sand canister mount to achieve proper fit. 

6. Use 30 Minute epoxy to secure the canister 

mount as shown. 

7. Reinstall the canister mount in the fuse. Allow 

epoxy to fully cure before moving on to the next 

step. 
44

8. Canister mount viewed from front as shown below. 

9. Assemble the canister to the header with the Teflon coupler and clamps in accordance with 

manufactures instructions. 

10. Slide the canister into the canister tunnel as 

shown below. 

11. Secure the header in place using the mounting 

bolts and gasket provided with your engine. Use 

blue Loctite to secure the bolts. 
45

12. Finished canister installation shown below. 

13. Reinstall canister hatch as shown below. Canister installation is now complete. 
46

1. Using a covering iron seal the covering around 

 the air exit holes as shown below. 

2. Use a hobby knife to remove the covering 

around the hot air exit holes as shown. 

3. Remove the (6) Phillips head screws holding the 

pipe hatch in place. 

Tuned Pipe Installation 

Tuned Pipe Installation 

 Gather the tuned pipe parts as shown: 

 Shown: (1) MTW RE2 Tuned Pipe 

 (1) 25mm Drop Double Bend Flex 

 Header 

(1) Teflon Coupler 

(2) Mounting Clamps 

(1) Pipe Mounting Bracket – 

 Supplied

Do not remove covering 

from canister stinger exit 

holes as shown below 
47

4. Tuned pipe mounting bracket location shown 

below. 

5. Test fit pipe mount in the fuse. If necessary sand 

pipe mount to achieve proper fit. 

6. Use 30 Minute epoxy to secure the pipe mount 

as shown. 

7. Reinstall the pipe mount in the fuse. Allow epoxy to fully cure before moving on to the next 

step. 
48

8. Pipe mount viewed from front as shown below. 

9. Remove engine to allow easier tuned pipe installation. 11. Slide the tuned pipe into the pipe tunnel as 

shown below. 

10. Assemble the tuned pipe to the header with the 

Teflon coupler and clamps in accordance with 

manufactures instructions. 
49

12. Reinstall engine as shown below. 

13. Secure the header in place using the mounting 

bolts and gasket provided with your engine. Use 

blue Loctite to secure the bolts. 

16. Finished tuned pipe and hatch assembly shown 

below. 

15. Reinstall pipe hatch as shown below. Pipe installation is now complete. 

14. Finished tuned pipe installation shown below. 
50

Throttle Servo and Choke Installation

1. Gather the left and right plywood throttle and 

choke servo mounting trays, the throttle and 

choke servos, servo arms and pushrod parts as 

shown below. 

 (2) x 4-40 metal rods threaded at one end 

 (4) x 4-40 ball links and hardware 

 (4) x brass spacers 

 (2) x 4-40 threaded solder couplers 

 (2) x 4-40 threaded quick links 

2. Use a 1/4” bit to drill a pushrod exit hole in the 

firewall in line with the engine carburetor throttle arm. 

3. Assemble ball link to threaded end of pushrod. 

Note: Thread ball link half way onto pushrod to 

 allow for proper adjustment during final 

 installation. 

4. Attach throttle pushrod to the carburetor throttle 

arm with the 4/40 ball link 
51

5. Assemble brass threaded coupler to 4-40 ball 

link and ball link and brass spacer to the servo 

arm as shown below. 

6. Install throttle servo into servo mounting tray. 

7. Assemble servo arm to servo at 90 degrees to 

servo. Align throttle servo with throttle pushrod 

and mark servo mounting location. Ensure the 

throttle pushrod will line up with the servo output arm with no binding. 

8. Check that mounting position of servo tray will 

not interfere with fuel tank installation. 
52

9. Apply 5 minute epoxy to the side of the servo 

mount that will be in contact with the engine box 

side. 

10. Install the servo mount to the inside of the engine box as shown. Use tape or clamps to ensure the servo mount does not move until the 

epoxy sets. 

11. With servo arm still 90 degrees to servo and 

throttle arm of carburetor in the center or half 

throttle position. Mark the cut location for the 

throttle push rod. 

12. Remove pushrod from throttle arm on carburetor 

and cut throttle pushrod to length. 
53

13. Gather the soldering tools as shown below. 

Note: For best results we recommend a high 

 quality Silver Solder like “Sta-Brite” silver 

 solder. 

14. Lightly sand end of pushrod for best bond. 

15. Solder the threaded brass coupler to the end of 

the throttle pushrod. 

16. Attach the throttle pushrod with the 4/40 ball 

links and secure. Power up the receiver and 

throttle servo and adjust pushrod for proper operation. Ensure the servo or rod does not bind or 

jam at closed or full open positions. 
54

17. If installing a choke servo use the provided 

mounting tray and hardware shown below. Following same installation steps used for installing 

throttle servo install choke servo. 

18. If a manual choke will be installed gather the 

choke pushrod, ball link, wheel collar and nylon 

ties as shown. Wheel collar and ties are Not 

Supplied. 

19. We recommend installing the carburetor choke 

pushrod as shown. Use nylon ties to provide 

support and holding friction for the choke pushrod. Place silicon fuel tubing over the wire 

pushrod to prevent damage from vibration and 

provide holding friction. Place a wheel collar on 

the end of the pushrod to provide a finger grip. 

20. Location of manual choke pushrod shown below. 
55

1. Gather the ignition module, battery, switch, 

regulator and installation parts as shown below. 

IGNITION INSTALLATION

2. Position the ignition module on the side of the 

engine mounting box and mark the location of 

the nylon tie holes as shown. 

3. Use a 1/8” bit to drill the ignition module 

mounting holes. 

4. Thread nylon tie through mounting holes. 
56

5. Roll the supplied foam rubber to make a 4 layer 

pad as shown. Make the pad slightly larger than 

the ignition module. 

6. Mount the engine ignition module using nylon 

tie and foam rubber as shown. 

7. Connect ignition module to pickup line of engine. Secure with Safety Clip, safety wire, tape 

or other method. Ensure the plugs will not come 

apart from vibration or light tension. 

8. Secure ignition wire with nylon ties as necessary. 
57

9. Mount ignition battery on opposite engine box 

side with nylon tie and foam padding. 

10. Switch mounting location is at builders discretion. Mark the location for the ignition switch 

using the switch mounting plate for a template. 

Using a modeling knife cut out the switch hole. 

Note: Ensure switch location does not interfere with 

 the mounting of the wing. 

11. Mount switch in accordance with the switch 

manufacturers instructions and hardware. 

12. Mount ignition regulator as desired. Secure all 

connectors with tape, safety clip or similar. 
58

Fuel Tank Assembly 

1. Gather the fuel tank parts as shown below. 

• Fuel tank 

• Hardware 

• Brass barbs 

• Fuel tubing 

FUEL TANK ASSEMBLY AND INSTALLATION

2. Locate the (2) supplied brass fuel barbs. Solder a 

brass fuel barb to the fuel line pick up tube. This 

will keep the weight of the fuel clunk from pulling the fuel line off the brass tube. 

Note: No brass barbs are required for the air vent 

lines. 

3. Assemble the fuel pick up line, rubber stopper 

and metal end caps. As shown below. 

4. Solder a brass fuel barb to the other end of the 

fuel pick up line. 
59

5. Final assembly of rubber fuel stopper with fuel 

pick up tube shown below. 

6. Install air vent tube into rubber stopper and bend 

upward. 

Note: No brass barbs are required for the air vent 

 tube. 

7. Install the fuel tubing and clunk. Secure the fuel 

tubing with nylon ties to the pick-up tube and 

clunk. 

8. Insert the rubber stopper assembly into the tank 

with the vent tube at the top of the tank. 
60

9. Secure the rubber stopper with set screw. Take 

care not to strip threads by over tightening set 

screw. 

Fuel Tank Installation 

1. Gather the fuel tank parts as shown below. Fuel 

tank, fuel tubing, foam rubber, fuel “T”, fuel 

filler dot, fuel filter and nylon ties. 

Note: The fuel “T”, and fuel filter are not supplied, 

but are available through Aeroworks. 

2. Install a short piece of fuel line and the fuel “T” 

to the fuel pick up tube. 

 

Note: Using a heat gun to soften the fuel line will 

help with the installation of the fuel “T”. 

3. Install the fuel filter, fuel pick up and fuel filler 

lines to the fuel tank. 

Note: It is recommended you always use a fuel 

 filter in the fuel line to the carburetor. 

T Filter 

Fill 

Line 

 Carb 
61

4. Use small nylon ties to secure fuel line. 

Note: Gasoline will cause the fuel line to expand 

 over time. Always secure fuel lines with nylon 

 ties to prevent them from pulling off during 

 flight. 

5. If using both a fuel and smoke tank position the 

tanks on their sides as shown below. 

Note: It will be necessary to drill the hold down lo-

 cations as shown if using both the fuel and 

 smoke tanks. 

 

6. Thread nylon ties under tank mounting plate and 

center in position. 

7. Install foam rubber pad for fuel tank to rest on. 

Foam rubber will help prevent fuel from foaming or getting air bubbles from engine vibration 
62

8. Install the tank. Run the fuel pick up line to the 

engine. Secure the tank with the two long nylon 

ties trim away any excess nylon tie as shown. 

9. Gather the fuel filler dot and drill bits as shown 

below. 

Note: We recommend you start with a smaller size 

 drill bit then increase the bit size to the 

 correct size to fit your filler dot. This will 

 help prevent the fuse side from splitting 

 or cracking. 

10. Mark location of fuel filler dot. 

11. Drill hole to accommodate fuel filler dot. 
63

12. Use thick CA to secure fuel dot in fuse. 

13. Feed filler line through dot and plug line into 

filler plug as shown. 

14. Secure fuel pick up line to engine carburetor 

with small nylon tie. 

15. Route the vent line on top of the fuel tank and 

secure with small nylon ties as shown. This will 

stop excess fuel from draining out the vent line 

during an extended down line or when lifting the 

tail. 
64

16. Feed vent line tubing through bottom of fuse. 

Cut off excess fuel line. 

Note: Place a zip tie around the vent line as shown. 

 Be careful not to tighten the zip tie to the 

 point of closing the vent line. This will pre-

 vent the vent line from falling back inside 

 the fuse and flooding the airplane with gas 

 during fueling. 
65

1. Gather the radio components as shown below. 

Battery, Switch, Regulator if used, receiver, 

foam rubber and Velcro one wrap straps. 

RADIO INSTALLATION

2. Mount radio switch in accordance with the 

switch manufacturers instructions and hardware. 

Note: Ensure switch does not interfere with wings 

 or cowl installation. 

3. Install regulator in accordance with manufacturers recommended installations. 

4. Install battery using foam padding and Velcro 

one wrap straps. 
66

5. Install receiver using foam padding and Velcro 

one wrap strap as shown. 

6. Install the receiver antenna in the pre-mounted 

antenna tube. Push the antenna into the antenna 

tube, be sure that the antenna is all the way into 

the tube. 

Note: Placing baby powder on the antenna will aid 

 in sliding it through the tube. 

7. Place tape on the antenna and tube, this will 

keep the antenna from backing out of the tube. 

8. Finished antenna installation shown below. 

Tape antenna to fuse floor if desired. 
67

9. Typical radio installation shown for heavier engine selections. 

Note: If models CG is tail heavy move batteries 

 forward. If models CG is nose heavy move 

 batteries to the rear. 

10. Reinstall engine box top hatch cover. 
68

1. Remove muffler as shown below. 

COWL INSTALLATION

2. Gather the materials as shown below. Template 

material, hobby knife, ruler, tape, marker and 

pencil. 

3. Tape the provided template material to the bottom of the fuse as shown below. 

4. Use a T-Pin to mark the location of the bottom 

cowl mounting bolts onto the template. 
69

5. Enlarge mounting holes using a hobby knife as 

shown. 

6. Use the bottom mounting bolts to keep the template secure. This will provide a consistent point 

of reference when marking and cutting the cowl. 

7. Mark “Cowl Side” on the top side of the template. It is very important that the template does 

not change position when attached to the cowl. 

8. Trace around the head of the engine being careful to keep the template in the same location. 
70

9. Use a hobby knife to cut out the engine cylinder 

exit opening as shown. 

10. Check the fit of the template at this time. It may 

be necessary to make small adjustments to the 

cutout to get it to fit properly. 

11. Using cowl mounting bolts align template with 

bottom of cowl. Use a felt tip marker to transfer 

the template cutout pattern to the cowl and mark 

cut location. 

Note: Pay close attention to the marker you 

 choose. Some permanent markers may not 

 be easily removed. Also, When using 

 rubbing alcohols or other paint removers, 

 always test on painted parts before using!

12. Remove the template and use a rotary cutting 

tool and sanding drum to cut out the openings in 

the cowl. 

Note: Take care not to cut or scratch the 

 cowl. 
71

13. Install the cowl and check that everything fits 

correctly and nothing rubs against cowl. If 

needed enlarge the cutouts and test fit again until 

everything fits correctly. 

14. If using canister or tuned pipe locate the pre-cut 

template and cut the hot air exits as shown. If 

using a pitts style muffler move on to the following steps. 

Cutting Cowl For Muffler Installation 

1. Gather the pitts style muffler as shown below. 

2. Enlarge the template that was made in an earlier 

step to create the muffler template as shown below. 

3. Follow the same marking and cutting method as 

described for the engine cylinder. 
72

4. It will be necessary to turn the cowling as shown 

in order to clear the muffler for installation. 

5. Mount cowl to the fuse using 

 (4) 4-40x16mm button style hex head bolts 

 (4)#6 bonded washers 
73

1. Gather (4) 8-32 wing mounting bolts, (4) #8 rubber backed washers and (4) hairpins for preparation of mounting the wings. 

PRE-FLIGHT PREPARATION

2. Slide the wing tube in the fuse wing tube sleeve. 

Slide the wings on the wing tube and plug in the 

aileron servo connectors. Slide the rubber 

backed washers on the wing mounting bolts and 

insert bolts through the fuse side and into the 

wing root blind nuts. Tighten snugly but do not 

over tighten and crack the fuse or wing root 

wood. 

3. Attach the 6” extension to the servo lead and 

secure with Aeroworks Safety Clip. Ensure the 

connectors will not come apart from vibration or 

light tension. 

4. Install hairpins into both front and rear 

 aluminum anti-rotation wing dowels to provide 

additional security. 
74

7. Gather (2) 4-40, (2) 6-32 cowl mounting bolts 

and (4) #6 small rubber backed washers. 

8. Mount the cowl using the cowl mounting bolts 

and rubber backed washers. The rubber backed 

washers are to prevent the fiberglass cowl from 

cracking and to prevent mounting bolts from 

loosing from normal engine vibration. 

6. Slide the stab tubes in the fuse stab tube sleeves. 

(Long Back / Short Front) Slide the stabs on the 

stab tubes and connect pushrod to servo arm. 

Slide the rubber backed washers on the stab 

mounting bolts and insert bolts through the stab 

mounting tabs and into the fuse blind nuts. 

Tighten snugly but do not over tighten and crack 

the stab mounting tabs or the fuse sides. 

5. Gather (4) 4-40 stab mounting bolts and (4) #6 

small rubber backed washers. 
75

10. Slide the rubber backed washers on the hatch 

mounting bolts and insert bolts through the hatch 

mounting holes and into the fuse blind nuts. 

Tighten snugly but do not over tighten and crush 

the hatch or the fuse sides. 

9. Gather the (4) 4-40 hatch mounting bolts and (4) 

#6 small rubber backed washers. 

Note: It is highly recommended you apply thin CA 

glue to the front hold down dowels. This is a High 

vibration area and can loosen the front dowels. 

Always check the front dowels are secure before 

each flying session 

Us thin CA to 

secure front 

hatch hold 

down dowels 
76

Decal installation

1. Decals supplied with the kit may vary from the 

photos below. Decal installation instructions are 

for reference purposes only. 

 Gather supplied decals, transfer tape, ruler, scissors, hobby knife, plastic squeegee or credit 

card, Windex or Application fluid like Rapid 

Tac. Also, a solution of 1 drop of dish detergent 

to a cup of water sprayed on the model will assist in proper positioning. 

Note: Clean surface and tighten all covering before 

 any decals are applied. 

DECAL INSTALLATION

2. Placement of optional decal package shown, included decals will differ. 

3. Placement of optional decal package shown, included decals will differ. 
77

4. Using rubbing alcohol or glass cleaner. Clean all 

areas before any decal installation. 

Note: Decals and model shown in following steps 

 may very from your model. 

 Decal installation will be similar 

5. Tighten all covering prior to any decal installation. 

6. Remove backing from decal sheet. 

7. Spray model surface with application fluid, 

Windex or soapy water solution. 
78

8. Spray back side of decal with application fluid, 

Windex or soapy water solution. 

9. Position decal in proper location. Application fluid 

will allow decal to be moved slightly. 

10. Using a plastic squeegee or credit card. Spread 

decal smooth and remove all excess application 

fluid. Let decal set until dry enough to be able to 

remove transfer tape with out removing decal. 

Do not leave until completely dry or transfer 

tape will be difficult to remove. 

11. Pull transfer tape from top of decal. Take care 

not to pull away or damage decal. 
79

12. Finished decal installation. Work slowly and 

carefully and you will be rewarded with a 

beautifully finished model. 
80

Center of Gravity (C.G.)

4” 

Back from the wing Leading Edge 

measured at the wing tip 

Warning

 Do not skip this step! 

CENTER OF GRAVITY - CONTROL THROWS

2. Balance the 50cc EXTRA 300 ARF-QB without 

fuel in the tank with the batteries installed and 

ready to fly. The engine, radio, servos, and battery you use will determine the final weight and 

locations of equipment. Try to balance the 

model by moving the battery and receiver before 

adding any ballast. 

Note: Model should sit level when lifted from the 

 wing tips

3. Start at recommended CG until you are comfortable with the flight characteristics of the aircraft. 

You may find this a bit nose heavy at first but 

that is fine to start with. After you are comfortable adjust the CG to suit your flying style in 

small steps, especially when shifting the CG toward the tail. Move the battery or add small 

stick on weights to the nose or tail as necessary. 

4. For aerobatic flying a more aft balance point is 

better. For smooth sport flying a more forward 

CG is better. An aircraft that is too nose heavy 

does not fly well and is difficult to land. A tail 

heavy aircraft is uncontrollable and will likely 

crash. 

5. We have test flown the model at 3 3/4” to 4 1/4” 

C.G. locations and found the model to fly well at 

all locations. However, best flight performance 

was achieved at the 4” location. 

Control Throws 

1. The amount of control throw should be adjusted 

using mechanical means as much as possible and 

then electronically with the radio. The control 

throws are shown in degrees and inches of deflection measured at the widest point of the control surface for both low and high rates. 

2. Use the widest part of the aileron as shown to 

measure the aileron throw in inches. 
81

3. Use the widest part of the elevator as shown to 

measure the elevator throw in inches. 

4. Gather the Rudder Throw Meter (Supplied) and 

scotch tape. 

5. Slide the throw meter under the rudder boost tab. 

6. Center the throw meter on the rudder using the 

centering marks on the meter to aid with alignment. Bend the precut positioning tabs down 

around the fin. 
82

7. Secure the tabs to the fin using scotch tape. 

8. Degrees are measured at the tip of the boost tab 

as shown below. 

9. Use the supplied flight control deflection meter 

to measure the throws in degrees. Prop up the 

tail of the aircraft until the fuselage is parallel to the table top. 

10. Use the widest part of the aileron to measure the 

aileron throw in degrees. 

11. Use the widest part of the elevator to measure 

the elevator throw in degrees.. 
83

Control Throw Deflection Table

 Low Rate High Rate

Aileron 1 3/4” or 18 ̊ up 2 1/2” or 25 ̊ up 

 1 3/4” or 18 ̊ down 2 1/2” or 25 ̊ down 

Rudder N/A” or 25 ̊ left N/A” or 35 ̊ left 

 N/A” or 25 ̊ right N/A” or 35 ̊ right 

Elevator 1 1/4” or 12 ̊ up 2” or 20 ̊ up 

 1 1/4” or 12 ̊ down 2” or 20 ̊ down 

For 3D flying use the following throws:

 3D Rate

Aileron 3 1/2” or 40 ̊ up

 3 1/2” or 40 ̊ down

Rudder N/A” or 45 ̊ left 

 N/A” or 45 ̊ right 

Elevator 4 1/2” or 45 ̊ up

 4 1/2” or 45 ̊ down

 We recommend 15% Expo on low rates, 30% 

expo on high rates, and 60% expo on 3D rates as 

a starting point. You a can adjust from there to 

suit your own flying style. 

Preflight Checks

Center of Gravity: Check CG is set properly. 

Engine: The engine should run smoothly at all 

throttle settings with smooth transition from 

idle to full throttle without stalling or hesitation. Do not fly an unreliable engine. Read 

engine instructions including break in and tuning completely. 

Prop balancing: Ensure prop is properly balanced 

prior to mounting on engine. 

Flight Controls: Ensure all flight controls are 

free from binding and are centered. Check 

that all hinges are tight and will not pull out. 

Control linkages must be rigid and tight and 

have no slop. Confirm proper direction of ailerons, rudder, and elevator. Experienced flyers have lost airplanes due to reversed ailerons. Right roll is right up, left down. Left roll 

is left up, right down. 

Batteries: Transmitter, ignition and receiver batteries are fully charged. 

Fasteners: Check all engine bolts, wing bolts, 

hatch bolts, servo screws, control horn bolts, 

wheel collars, and clevis keepers are tight and 

secure. 

Covering: Check all covering and seams are 

sealed and secure. 

Radio: Check trims set to neutral and controls 

centered. Check rate and condition switches 

set properly. Check the receiver antenna is 

fully extended and not reversed on it self. 

Range check: Do a range check with and without 

the engine running in accordance with the radio manufacturer instructions. If there is insufficient range or a large reduction with the 

engine running, do not fly until it is resolved! 

Fuel: Fill the fuel tank before each flight. 
84

Aerobatics

The 50cc EXTRA 300 ARF-QB is capable of any 

aerobatic maneuver. After you gain some confidence and little experience flying the airplane you 

can cut loose and perform any maneuver you can 

think of. Here is a list of some of the more popular 

aerobatic and 3D maneuvers you can try: 

• Loops and rolls 

• Knife edge flight 

• Stall turns 

• Snap rolls 

• 2, 4, and 8 point rolls 

• Slow rolls 

• Spins upright and inverted 

• Flat Spins upright and inverted 

• Harriers upright and inverted 

• Water falls 

• Torque Rolls 

• Rolling circles 

The sky and your imagination are you only limits. 

FLY and ENJOY! 

AEROWORKS 
85

50 cc EXTRA 300 ARF-QB NOTES

___________________________________________________________________________ 

___________________________________________________________________________ 

___________________________________________________________________________ 

___________________________________________________________________________ 

___________________________________________________________________________ 

___________________________________________________________________________ 

___________________________________________________________________________ 

___________________________________________________________________________ 

___________________________________________________________________________ 

___________________________________________________________________________ 

___________________________________________________________________________ 

___________________________________________________________________________ 

___________________________________________________________________________ 

___________________________________________________________________________ 

___________________________________________________________________________ 

___________________________________________________________________________ 

___________________________________________________________________________ 

___________________________________________________________________________ 

___________________________________________________________________________ 

___________________________________________________________________________ 

__________________________________________________________________________