INSTRUCTION MANUAL

®
EN 2

• Always keep a safe distance in all directions around your model to avoid collisions or injury. This model is controlled by a radio signal subject to interference 

from many sources outside your control. Interference can cause momentary 

loss of control.

• Always operate your model in open spaces away from full-size vehicles, traffi c 

and people.

• Always carefully follow the directions and warnings for this and any optional 

support equipment (chargers, rechargeable battery packs, etc.).

• Always keep all chemicals, small parts and anything electrical out of the reach 

of children.

• Always avoid water exposure to all equipment not specifi cally designed and 

protected for this purpose. Moisture causes damage to electronics.

• Never place any portion of the model in your mouth as it could cause serious 

injury or even death.

• Never operate your model with low transmitter batteries.

• Always keep aircraft in sight and under control.

• Always move the throttle fully down at rotor strike.

• Always use fully charged batteries.

• Always keep transmitter powered on while aircraft is powered.

• Always remove batteries before disassembly

• Always keep moving parts clean.

• Always keep parts dry.

• Always let parts cool after use before touching.

• Always remove batteries after use.

• Never operate aircraft with damaged wiring.

• Never touch moving parts.

Age Recommendation: Not for children under 14 years. This is not a toy.

CAUTION: The ESCs for the 350 QX3 are not compatible with any other product, and the 350 QX3 is not compatible with any other ESCs. Use of any other 

ESCs on the 350 QX3 will cause a crash, which may result in property damage and/or personal injury.

WARNING AGAINST COUNTERFEIT PRODUCTS: If you ever need to replace a Spektrum component found in a Horizon Hobby product, always purchase 

from Horizon Hobby, LLC or a Horizon Hobby authorized dealer to ensure authentic high-quality Spektrum product. Horizon Hobby, LLC disclaims all support and warranty with regards, but not limited to, compatibility and performance of counterfeit products or products claiming compatibility with DSM or Spektrum.

WARNING: Read the ENTIRE instruction manual to become familiar with the features of the product before operating. Failure to operate the product 

correctly can result in damage to the product, personal property and cause serious injury. 

This is a sophisticated hobby product. It must be operated with caution and common sense and requires some basic mechanical ability. Failure to operate this 

Product in a safe and responsible manner could result in injury or damage to the product or other property. This product is not intended for use by children without 

direct adult supervision. Do not use with incompatible components or alter this product in any way outside of the instructions provided by Horizon Hobby, LLC. 

This manual contains instructions for safety, operation and maintenance. It is essential to read and follow all the instructions and warnings in the manual, prior to 

assembly, setup or use, in order to operate correctly and avoid damage or serious injury.

The following terms are used throughout the product literature to indicate various levels of potential harm when operating this product:

NOTICE: Procedures, which if not properly followed, create a possibility of physical property damage AND a little or no possibility of injury.

CAUTION: Procedures, which if not properly followed, create the probability of physical property damage AND a possibility of serious injury.

WARNING: Procedures, which if not properly followed, create the probability of property damage, collateral damage, and serious injury OR create a high probability of superfi cial injury.

NOTICE

All instructions, warranties and other collateral documents are subject to change at the sole discretion of Horizon Hobby, LLC. For up-to-date product literature, 

visit horizonhobby.com and click on the support tab for this product. 

Meaning of Special Language

General Safety Precautions and Warnings 

Before operating this product, consult all applicable local and national regulations, as well as any accredited modeling associations in your area. In the US, airspace 

regulations are governed by the Federal Aviation Administration (FAA) and applied in part by the Academy of Model Aeronautics (AMA). You are responsible for both 

how and where you fl y your aircraft.

FAA Website: http://www.faa.gov/

AMA Website: http://www.modelaircraft.org/
3 EN

Table of Contents

Components

Airframe Blade® 350 QX3 Quadcopter

Motors 4x Brushless Outrunner Motor, 1100Kv

ESCs 4x 10-Amp Brushless ESC

Battery 3000mAh 3S 11.1V 20C Li-Po Battery

Charger 3S DC Li-Po Balancing Charger with 5A AC Power Supply

Transmitter SpektrumTM DX4 DSMX® 4-Channel Transmitter (RTF, AP Combo)

Camera/Gimbal CGO2 GB 1080p HD (AP Combo)

Specifi cations

Length 18.30 in (465mm)

Height 7.48 in (190mm)

Rotor Diameter 22.80 in (580mm)

Flying Weight 33.7 oz (955 g)

To register your product online, visit www.bladehelis.com

Box Contents ......................................................................................................4

Charging Warnings..............................................................................................4

Low Voltage Cutoff (LVC) .....................................................................................4

Charging the Flight Battery .................................................................................5

Install the Gimbal (AP Combo) .............................................................................5

Install the Transmitter Batteries (RTF, AP Combo) .................................................5

Transmitter Control Layout (RTF, AP Combo) ........................................................6

Extend the GPS Mast ..........................................................................................6

Install the Flight Battery ......................................................................................6

Transmitter Setup and Binding (BNF) ...................................................................7

Binding ...............................................................................................................8

Flight Mode Switch (RTF, AP Combo) ...................................................................9

Flight Modes Explained .......................................................................................9

LED Codes ........................................................................................................10

GPS Functionality ..............................................................................................10

Flight Guidelines and Warnings .........................................................................11

Preparing the 350 QX3 For Flight ......................................................................11

Flying the 350 QX3 ...........................................................................................11

Calibration Procedures ......................................................................................13

Graphic User Interface ......................................................................................14

Troubleshooting ................................................................................................14

Parts of the 350 QX3 .........................................................................................15

INSTRUCTION MANUAL
EN 4

Box Contents

Charging Warnings

WARNING: Failure to exercise caution while using this product and comply 

with the following warnings could result in product malfunction, electrical 

issues, excessive heat, FIRE, and ultimately injury and property damage.

• NEVER LEAVE THE POWER SUPPLY, CHARGER AND BATTERY UNATTENDED 

DURING USE.

• NEVER CHARGE BATTERIES OVERNIGHT.

• Never attempt to charge dead, damaged or wet battery packs.

• Never attempt to charge a battery pack containing different types of batteries.

• Never allow children under 14 years of age to charge battery packs.

• Never charge batteries in extremely hot or cold places or place in direct 

sunlight.

• Never charge a battery if the cable has been pinched or shorted.

• Never connect the charger if the power cable has been pinched or shorted.

• Never attempt to dismantle the charger or use a damaged charger.

• Never drop charger or batteries.

• Always use only rechargeable Li-Po batteries designed for use with this type 

of charger.

• Always inspect the battery before charging.

• Always keep the battery away from any material that could be affected by 

heat.

• Always monitor the charging area and have a fi re extinguisher available at all 

times.

• Always end the charging process if the battery becomes hot to the touch or 

starts to change form (swell) during the charge process.

• Always connect the charge cable to the charger fi rst, then connect the battery 

to avoid short circuit between the charge leads. Reverse the sequence when 

disconnecting.

• Always connect the positive red leads (+) and negative black leads (–) correctly.

• Always disconnect the battery after charging, and let the charger cool between 

charges.

• Always charge in a well-ventilated area.

• Always terminate all processes and contact Horizon Hobby if the product 

malfunctions.

Low Voltage Cutoff (LVC)

Low voltage cutoff (LVC) protects the Li-Po battery from over-discharge in fl ight 

and activates when the battery reaches a preset value. When the battery is 

discharged to the cutoff point, the aircraft will display rapidly fl ashing red, green 

and blue LEDs to warn you it’s time to land. When you see this LED code, land 

immediately to prevent over-discharge and damage to the battery.

When the LVC is activated, you have approximately 2 minutes until the battery is 

depleted and can no longer maintain a hover. Repeated fl ying to LVC will damage 

the battery.

NOTICE: Crash damage and battery damage are not covered under warranty. 

IMPORTANT: Always disconnect and remove the Li-Po battery from the aircraft 

after each fl ight. Charge your Li-Po battery to about half capacity before storage. 

During storage, make sure the battery charge does not fall below 3V per cell. 

A connected battery will result in trickle discharge.

• Blade 350 QX3

• CGO2 3-Axis Camera/Gimbal (AP Combo)

• 3000mAh 3S 11.1V 20C Li-Po Battery

• 3S DC Li-Po Balancing Charger with 5A AC Power Supply

• Spektrum DX4 DSMX

4-Channel Transmitter (RTF, AP Combo)

• 4 AA Batteries (RTF, AP Combo)

• Cell Phone Mount
5 EN

Charging the Flight Battery

Charger Specifi cations

• Input Voltage: 10.5–15V DC

• Charge Current: 3.5A

Charger LED Codes

Green Blinking: Power connected

Red Blinking: Charging

Red & Green Blinking: Cells balancing

Green Solid: Charging complete

Red Solid: Error

CAUTION: All instructions and warnings must 

be followed exactly. Mishandling of Li-Po 

batteries can result in a fi re, personal injury and/or 

property damage.

NOTICE: If using a battery other than the included 

Li-Po battery, refer to your battery manufacturer’s 

instructions for charging.

1a 1b

2 3

Install the Gimbal (AP Combo)

Install the Transmitter Batteries (RTF, AP Combo)

The Battery Charging Process

1. Connect the AC power supply to the charger.

2. Connect the AC power supply to an AC power source. 

The green LED blinks.

3. Connect the battery to the charger. The red LED 

blinks, indicating charging. When the battery nears 

full charge, the red and green LEDs blink, indicating 

cell balancing.

4. Disconnect the battery when the green LED glows 

solid.

• Slide the gimbal on the mount rails until it locks.

• Connect the wiring harness to the plug on the bottom 

of the 350 QX3.

• To remove the gimbal, press the tab at the front of 

the mount and slide the gimbal forward.

• Install 4 AA batteries in the transmitter as shown.

b

a

AP C b )
EN 6

Install the Flight Battery

Transmitter Control Layout (RTF, AP Combo)

Mode Switch

0 - Smart Mode

1 - AP Mode

2 - Return Home

Gimbal 

control 

switch

Aileron/Roll

Motor Stop/Bind Button

Elevator/Pitch

Rudder/Yaw

Throttle/Altitude

Power Switch

Extend the GPS Mast

a

b d

c
7 EN

Transmitter Setup (BNF)

Transmitter Model 

Type

Switch Select Reversing Throttle Cut Model Setup Switch Position

DX6i

acro n/a gear - R

All others - N

act Travel Adj: Flap ↑ 120 ↓ 100 

Throttle Subtrim: ↑ 10

Fl aps: FLAP

Norm ↑ 100

land ↓ 100 

Mi x 1:

gear → gear act

rate: D –60%, U 0%

SW: ele d/r

Smart Mode = F Mode ( POS. 0)

Return Home = F Mode (POS. 1)

AP MODE = ELE D/R (POS 1)

GI MBAL control = FLAP (POS 1),

Throttle controls gimbal angle

Ac celerometer calibration = Set FLAP to POS 0 and cycle 

Flight Mode switch 4 times

Co mpass calibration = Set FLAP to POS 10 and cycle 

Flight Mode switch 4 times

DX6

airplane Ch annel Assign:

Channel Input 

Confi g (2nd page):

Gear: B

AUX1: A

S ervo setup:

AUX1 - R

All others - N

Th rottle cut:

Position: 

–130%

Switch: Switch i

Se rvo setup:

Travel:

120%

140%

AX1

Smart Mode = Switch B ( POS. 0)

AP MODE = Switch B (POS 1)

Return Home = Switch B (POS. 2)

GI MBAL Control = Switch A (POS 1),

Throttle controls gimbal angle

Co mpass calibration = Switch A (POS 1) and

cycle B switch 4 times 

Ac celerometer calibration = Switch A (POS 0) and

cycle B switch 4 times

DX7s

airplane Knob: AUX2

Gear: AUX1

Flap: Gear

Se rvo setup:

All NORM

Th rottle cut:

0% Trainer

Se rvo setup:

Travel:

Aux1 120% 140%

Smart Mode = Flap switch ( POS. 0)

AP MODE = FLap switch (POS 1)

Return Home = Flap switch (POS. 2)

GI MBAL Control = Gear switch (POS 0),

Knob controls gimbal angle

Co mpass calibration = Gear switch (POS 0) and

cycle FLAP switch 4 times

Ac celerometer calibration = Gear switch (POS 1) and 

cycle FLAP switch 4 times

DX8

airplane Gear: AUX1

Knob: AUX2

F Mode: Gear 

Se rvo setup:

All NORM

Th rottle cut:

0% Trainer

Se rvo setup:

Travel:

Aux1 120% 140%

Smart Mode = F Mode switch ( POS. 0)

AP MODE = F Mode switch (POS 1)

Return Home = F Mode switch (POS. 2)

GI MBAL Control = Gear switch (POS 0),

Knob controls gimbal angle

Co mpass calibration = Gear switch (POS 0) and

cycle FLAP switch 4 times 

Ac celerometer calibration = Gear switch (POS 1) and 

cycle FLAP switch 4 times 

DX9/DX18

airplane Ch annel Assign:

Channel Input

Co nfi g (2nd page):

Gear: B

AUX1: A

AUX2: R Knob

Se rvo setup:

All NORM

Th rottle cut:

Position: 

–130%

Switch: Switch i

Se rvo setup:

Tr avel:

140%

120%

AX1

Smart Mode = Switch B ( POS. 0)

AP MODE = Switch B (POS 1)

Return Home = Switch B (POS. 2)

GI MBAL Control = A switch (POS 0),

Knob controls gimbal angle

Co mpass calibration = A switch (POS 0) and

cycle B switch 4 times 

Ac celerometer calibration = Gear switch (POS 1) and 

cycle B switch 4 times 
EN 8

Binding

The RTF/AP combo transmitter is bound to the model 

at the factory. If for any reason the model needs to be 

re-bound, follow the directions below.

Normal Bind

Roll left

Roll right

Bind with GPS enabled

Bind with GPS disabled

Bind button

Transmitter Bind Codes

Entering Bind Mode

Binding the 350 QX3 To Your Transmitter

1. With the transmitter and quadcopter powered OFF, 

connect the battery to the 350 QX3.

2. Place the 350 QX3 on a fl at level surface.

3. Power the 350 QX3 ON and let it initialize. The 

status LED will remain off.

4. Hold the 350 QX3 upside down until the status LED 

fl ashes blue, indicating it has entered bind mode.

5. Set the quadcopter back upright.

6. On your transmitter, ensure the throttle is in the low 

position and the throttle trim is at neutral.

7. Power ON your transmitter in bind mode according 

to the instructions included with your transmitter.

8. When the binding process is successful, the

350 QX3 will emit a quick, 3-beep tone and the LED 

will fl ash either green, purple or red, depending on 

which fl ight mode is selected.

If the LED is fl ashing red, the 350 QX3 is in Return 

Home mode. Switch to Smart or AP Mode (green 

or purple fl ashing) before attempting to start the 

motors.

9. Place the quadcopter outdoors in the desired

starting position in preparation for fl ight.
9 EN

Flight Modes Explained

Smart Mode

This fl ight mode is intended for 

the beginner pilot. For best results while using Smart Mode,

it is recommended the pilot 

always turn to face the

350 QX3 while fl ying. 

• Stick Relativity– While in 

Smart Mode, the path of the aircraft will always 

follow the control stick input direction relative to the 

pilot location, regardless of the direction the nose of 

the aircraft is pointing. 

• SAFE CircleTM feature– In most scenarios, the quad 

will not enter the SAFE Circle. 

• Position Hold– The aircraft will hold its position when 

elevator and aileron inputs are at neutral.

• Self-Leveling– Brings the 350 QX3 to a level attitude 

when the elevator and aileron inputs are at neutral.

• 100 m geo-fence– The 350 QX3 uses GPS information to create a virtual barrier and will not travel

farther than 100 meters from the home position.

AP Mode

This fl ight mode keeps the

350 QX3 in a steady hover

and locked into position while 

the controls are held at neutral, 

making it deal for image/video 

capture. 

• Control Input– While in AP Mode, the 350 QX3

follows the control stick input direction relative to the 

position and orientation of the aircraft rather than the 

position of the pilot.

• Position Hold– The aircraft will hold its position when 

elevator and aileron inputs are at neutral.

• Self-Leveling– Brings the 350 QX2 AP to a level 

attitude when the elevator and aileron inputs are at 

neutral.

• 100 m geo-fence– The 350 QX3 uses GPS information to create a virtual barrier and will not travel

farther than 100 meters from the home position.

Smart Mode Stick Relativity Control Inputs

Flight Mode Switch (RTF, AP Combo)

Smart Mode

(Solid Green LED on the 350 QX3)

AP Mode

(Solid Purple LED on the 350 QX3)

Return Home

(Red fl ashing LED on the 350 QX3)

AP Mode Control Inputs

NOTICE: If the 350 QX3 loses GPS signal while fl ying in either Smart or AP Mode, the LED will fl ash either green or purple, depending on which fl ight mode you are 

currently using, and the 350 QX3 will default to a stable fl ight mode with similar control response as AP Mode without the availability of position hold. Return Home 

will not function. Please familiarize yourself with the controls in AP Mode to ensure a safe return of the 350 QX3 in the event of GPS signal loss.

Pilot location

Right transmitter stick

Right transmitter stick

Stick commands move the 350 QX3 

relative to the pilot location

Stick commands move the 350 QX3 

relative to the quadcopter’s orientation

Front

=

=

Away from the pilot

Toward 

the pilot

Solid Green LED

Solid Purple LED
EN 10

LED Codes

Startup Codes

Flying Codes

Radio off or not bound to the quad .......................................

Initialization failed ................................................................

IMU initialization ..................................................................

Fully charged battery ...........................................................

Fully discharged battery .......................................................

Emergency mode (cycle power to reinitialize) .......................

Bind mode ...........................................................................

GPS Disabled .......................................................................

Smart Mode, waiting for GPS ...............................................

Smart Mode, GPS lock .........................................................

AP Mode, waiting for GPS.....................................................

AP Mode, GPS lock ...............................................................

Return to home mode activated ...........................................

GPS lost while in Smart mode (in fl ight)................................

GPS lost while in AP mode or return to home (in fl ight) .........

Battery voltage below 10.9V ................................................

Battery voltage below 10.6V ................................................

Compass calibration needed ................................................

CAUTION: If you see the LED signal for low 

battery (10.6V), immediately land your aircraft 

and recharge the battery.

CAUTION: Do not attempt to use Return Home 

with a low battery.

No LED

GPS Functionality

To acquire a reliable GPS signal, it is important the 350 QX3 has a clear view of 

the sky. Obstructions that can affect the aircraft’s ability to acquire an acceptable 

signal include:

• Flying close to or around tall/big buildings

• Flying under dense vegetation

• Flying indoors or under a structure

If you cannot acquire a GPS lock at startup, the motors cannot be started in either 

Smart Mode or AP Mode. You will have to re-bind the quadcopter with the GPS 

functions turned off to allow you to start the motors for fl ight (see the Binding 

section). It is not possible to use Smart Mode without having GPS enabled. If the 

350 QX3 is initialized with GPS disabled, it will default to AP Mode without position 

hold, but will still be capable of altitude hold. 

If you lose the GPS signal while fl ying, the aircraft will not have Stick Relativity, the 

SAFE CircleTM feature, Position Hold or Return Home functions available. We recommend maneuvering the 350 QX3 by steering with forward elevator and rudder only 

if GPS signal is lost.

CAUTION: Do not attempt to fl y the 350 QX3 with GPS enabled while 

indoors or in a location where the GPS signal is known to be poor, as loss 

of signal could result in a crash.

GPS Functions

(see the Binding section for turning GPS functions ON and OFF )

With GPS ON

• If the 350 QX3 took off with GPS lock and a home position set, when Return 

Home mode is activated the quadcopter will fl y back to the start position 

(maintaining altitude along the way), then reduce altitude to land.

• If the 350 QX3 loses GPS lock while fl ying in Smart, AP or Return Home

mode, the LED will fl ash green, purple or red, depending on which fl ight mode 

you are currently using. The 350 QX3 will default to a stable fl ight mode with 

similar control response to AP Mode without the availability of position hold.

• If the 350 QX3 deviates too far from its intended GPS path when in Return 

Home mode, it will descend using the barometric pressure sensor to maintain 

the descent rate.

• Once the 350 QX3 has landed in Return Home mode, it will stop the motors.

With GPS OFF

• The LED will show solid white.

• The fl ight mode available will be similar in control response to AP Mode

without the availability of position hold.

• Altitude hold will function normally.

Loss of GPS Signal

If the 350 QX3 loses GPS signal in fl ight, it will respond according to the

following conditions:

Smart Mode: (Green fl ashing LED)

If the 350 QX3 loses GPS signal in fl ight while in Smart Mode the LED will 

fl ash green. The stick relativity feature of Smart Mode will not function. The 

350 QX3 will follow the control stick input direction relative to the position and 

orientation of the aircraft rather than the position of the pilot, similar to the 

control response in AP Mode. Return home will not function. The aircraft will 

still use the pressure sensor to maintain altitude and control rate of descent.

If GPS signal is reacquired, after receiving 5–10 seconds of reliable GPS 

signal, the Smart Mode functions return.

AP Mode: (Purple fl ashing LED)

If the 350 QX3 loses GPS signal in fl ight while in AP Mode the LED will fl ash 

purple. The quadcopter will not enter GPS position hold when the right stick is 

returned to center. Return home will not function. If GPS signal is reacquired 

after receiving 5-10 seconds of reliable signal, AP Mode functions return.

Loss of Transmitter Signal

If the transmitter signal is lost for any reason, the 350 QX3 will respond

according to the following conditions:

• If the motors are stopped, the 350 QX3 will disarm.

• If the motors are turning but the 350 QX3 is not fl ying, it will stop the motors 

and disarm. 

• If the 350 QX3 is fl ying and has a good GPS lock with a home position set, it 

will activate the Return Home function (rapid red fl ashing LED) upon the loss 

of the transmitter signal. 

• If the compass is faulty, not connected or if there is no GPS lock,

the 350 QX3 descends slowly when the transmitter signal is lost.

• If the pressure sensor is not working, the 350 QX3 reduces power to

control the decent when the transmitter signal is lost.
11 EN

Flight Guidelines and Warnings

• Always inspect the model before fl ight. 

• Always keep aircraft in sight and under control.

• Always keep people and pets at least 35 feet (10 meters) away when the 

battery is connected.

• Keep children out of the vicinity of this product at all times.

• Always use fully charged batteries.

• Always keep transmitter powered on while aircraft is powered. 

• Always remove batteries before disassembly.

• Always keep moving parts clean.

• Always keep parts dry.

• Always let parts cool after use before touching.

• Always remove batteries after use.

• Never operate aircraft with damaged wiring.

• Never touch moving parts.

• Always follow the most up to date AMA National Model Aircraft Safety Code. Preparing the 350 QX3 For Flight

CAUTION: When the home location is set (step 6), the 350 QX3 must be approximately 16 feet (5 meters) from where the pilot will stand during fl ight, pointing away from the pilot. If the aircraft is pointed in any other direction, the SAFE Circle feature will not function as expected and may result in personal injury 

or damage to property. Once the aircraft’s motors are started, do not change your position.

1. Power on the transmitter with the fl ight mode set to 

Smart Mode.

2. Remove the battery hatch. Install a fully charged

battery pack, connect the blue EC3TM battery connector 

and reinstall the hatch.

3. With the quad on a level surface, turn on the power 

switch and allow the 350 QX3 to initialize.

If the GPS is enabled, wait for the GPS signal to be

acquired (solid green LED).

IMPORTANT: While in Smart Mode, the motors will not 

start if a GPS signal has not been acquired.

4. Move the aircraft to the desired home location and

orient the aircraft pointed away from the pilot.

5. Step back approximately 16 feet (5 meters) from the 

home location.

6. To start the motors, move both sticks into the bottom 

inside corners, then back to center.

7. The props will begin to spin. The home position for GPS 

functions is set and your aircraft is ready to fl y. 

Lower the throttle stick fully and hold the bind button to 

stop the motors after fl ight.

16 feet (5 meters)

350 QX3 home location

Pilot location

Smart Mode Flying Front

LED

Flying the 350 QX3

Takeoff

The throttle control for the 350 QX3 changes the altitude 

of the quadcopter by moving the throttle stick above or 

below half throttle. As you move the throttle stick above 

half, the quadcopter will climb. As you move the throttle 

stick below half, the quadcopter will descend. The farther 

away from half you move the throttle stick, the faster the 

quadcopter will climb or descend.

To takeoff, slowly advance the throttle to slightly above 

half. The 350 QX3 will slowly climb. When the quadcopter 

reaches the desired height, ease the throttle back to half 

to hold that altitude.

Explore the fl ight envelope of the 350 QX2 AP in 

Smart Mode without fear of losing orientation. See 

the diagrams in the Flight Modes Explained section for 

more details on the aircraft’s function in Smart Mode.

In Smart Mode, the direction the aircraft is pointing 

does not affect the control, and the aircraft’s response 

relative to you (the pilot location) does not change with 

orientation. AP Mode operates more like a conventional 

RC helicopter or multicopter.

Throttle stick

Climb

Descend

NOTICE: If you begin to lose control, release the control 

sticks and the model will self-level.

Pay close attention to the LED while fl ying. If at any time 

the LED indicates the fl ight battery voltage is low (below 

10.6V), as shown In the LED code section, land the 350 

QX3 immediately and charge the fl ight battery.

SAFE CircleTM
EN 12

Return Home

NOTICE: Return home will only function if the

350 QX3 has GPS lock.

• When this feature is activated, the LED will rapidly 

fl ash red.

• The 350 QX3 will fl y back to its assigned home location and land. After landing, the motors may take up 

to 5 seconds to stop.

• The return home function may be cancelled by 

switching back to Smart or AP Mode using the fl ight 

mode switch.

• To restart the props after landing in Return Home, 

move both transmitter sticks to the bottom inside 

corners and then back to center.

CAUTION: The 350 QX3 will not recognize the 

SAFE Circle feature when Return Home is used. 

Activating Return Home may cause the 350 QX3 to 

fl y directly over the pilot if the aircraft was fl own to a 

position behind where the pilot was standing when the 

home position was established.

Activating Return Home Landing

To land the 350 QX2 AP there are two options: 

• Guide the aircraft to where you wish to land. Slowly 

reduce the throttle below half to descend and land. 

When the quadcopter has landed, lower the throttle 

completely and press the bind button to stop the 

motors.

• Activate the Return Home function to return the

350 QX3 to the assigned home location and land 

automatically.

CAUTION: Do not activate the Return Home

function if the 350 QX3 is showing the low

battery indication. Manually land the aircraft

immediately.

After Your Flight

1. Turn off the power switch on the 350 QX3.

2. Turn off the power to your transmitter.

3. Unplug and remove the battery from the 350 QX3. 

Recharge your battery following the charging

warnings and instructions.

CAUTION: Always disconnect the Li-Po battery from the aircraft when not fl ying to avoid 

over-discharging the battery. Batteries discharged to a 

voltage below the lowest approved voltage may become 

damaged, resulting in loss of performance and potential 

fi re when batteries are charged.

Location alert

The motors will beep under the following conditions:

• At any time the props stop spinning after they have 

been initialized. 

• After 30 seconds of no throttle input (waiting armed 

on the ground).

This will alert the pilot to the location of the aircraft if it 

lands in a location with low visibility. 

Beeping will continue until the battery can no longer 

supply enough power to the motors.

If the quadcopter crash lands and one or more motors 

are stopped by an impact, the quadcopter enters 

emergency mode. The LED will fl ash white and the 

motors will beep loudly.

b

a

Motor Stop
13 EN

North

4X

4X

a b c d

Calibration Procedures

Compass calibration procedure:

NOTICE: The following procedure has to be

completed within 30 seconds after entering compass 

calibration mode.

1. Power the transmitter.

2. Power on the 350 QX3 and face the

quadcopter pointing North.

3. Cycle the top left transmitter switch completely

4 times as shown at the left.

4. The 350 QX3 indicates it has entered compass

calibration mode by slowly fl ashing the LED orange.

5. When the LED begins to fl ash rapidly, complete

all 4 rotations of the 350 QX3 as shown in the

illustration at left within 30 seconds, rotating the 

quad 45° counterclockwise between each rotation.

6. Hold the quad level, facing North and check the LED.

Green = Ready

Red = Repeat Compass Calibration

Accelerometer calibration procedure:

1. Power on the transmitter and 350 QX3 and

place the quad on a fl at, level surface.

2. While holding the bind switch on the transmitter, 

cycle the top left switch 4 times as shown at the left.

3. The 350 QX3 will emit a series of slow tones

followed by a series of rapid tones, indicating the 

calibration has started.

4. Do not move the 350 QX3 while it performs the

accelerometer calibration procedure.

5. When the procedure has completed, the 350 QX3 will 

emit a “happy” tone and the LED will display green 

indicating the calibration was successful. If it emits a 

“sad” tone and the LED displays solid red, repeat the 

calibration procedure. 

Pressure Sensor Calibration 

The pressure sensor is calibrated at the factory on the 

350 QX3. Recalibration should only be necessary if you 

replace the sensor. 

1. Place the 350 QX3 in a cold area. Allow it to remain 

in the cold for 30 minutes or more. 

2. Bring the 350 QX3 out of the cold and into a warm 

area. The greater the difference in temperature 

between the cold and warm areas, the more accurate 

the calibration will be.

3. Ensure your transmitter is off and then connect a 

fl ight battery to the 350 QX3Power the 350 QX3 ON 

and let it initialize. The status LED will remain off.

4. Hold the 350 QX3 upside down until the status LED 

fl ashes blue, indicating it has entered bind mode.

5. Set the quadcopter back upright.

6. Bind your transmitter to the 350QX3 with the rudder 

stick fully to the right. The LED will blink red and blue 

rapidly. Leave the aircraft and transmitter powered 

on and allow the aircraft to warm up for 10 minutes. 

Do not move the aircraft during this time.

7. After 10 minutes the motors on the aircraft will beep 

to indicate the calibration is complete. Power off the 

aircraft and then your transmitter. 

If the 350 QX3 displays the failed calibration code, power 

off the aircraft and then begin the pressure calibration 

procedure again. 

Rudder right

Bind in pressure calibration mode
EN 14

Graphic User Interface

Troubleshooting

Problem Possible Cause Solution

350 QX3 will not initialize The quadcopter was moved during initialization Re-arm the aircraft, being cautious to avoid any movement during

initialization

GPS will not lock

Heavy overcast Wait for lighter cloud cover and re-lock or disable GPS

Solar fl ares Wait for disturbance to subside or disable GPS

Aircraft is indoors Disable GPS

Objects blocking clear access to the sky

(under a metal cover, inside a car, tall buildings, etc...) Move aircraft to a clear area

Video transmitter nearby Re-position or remove video transmitter

GPS has reduced resolution

Raised threat level by the U.S. government Wait for threat level to be reduced or disable GPS

The GPS antenna coaxial cable is nicked, cut,

or otherwise damaged Replace the GPS antenna

GPS functions not operating 

properly

The compass has been exposed to a magnet Move the aircraft away from the magnetic source. In worst case

scenario, the compass may need to be replaced

The GPS antenna coaxial cable is nicked, cut, or otherwise 

damaged Replace the GPS antenna

The aircraft is behaving erratically Rebind the aircraft with the GPS function off

Aggressive fl ight Fly level for a few seconds before using other modes

Motors won’t start

GPS lock has not been acquired Ensure GPS antenna has clear view of sky and GPS lock has been 

acquired

‘Compass error’ is indicated by the LED See below for troubleshooting ‘compass error’

Incorrect start up procedure Review start up procedure in manual

Blinking yellow led

‘compass error’ indication

Model is too close to a metal object or metal surface Move model away from large metal objects or surfaces

Compass needs calibration Calibrate compass

(see calibration reference)

Steady beeping,

motors won’t start Throttle trim is not centered

Calibrate DX4 transmitter

(AP or RTF version)

Center throttle trim (BNF version)

Won’t hold position in hover

Weak GPS signal Check GPS antenna mast is extended

Compass needs calibration Calibrate compass

(see calibration guide)

Accelerometers need calibration Calibrate accelerometers

(see calibration guide)

Motors take a long period of

time to shut off after completing 

return to home

Pressure calibration is needed Refer to the Pressure Sensor Calibration section of this manual

If you need to update the fi rmware in your quadcopter, download the PC user

interface* at http://www.bladehelis.com/ProdInfo/Files/350_QX_PC_Interface.zip

Follow the on-screen instructions for installation and operation.

This graphic user interface allows you to monitor systems, adjust system settings 

and calibrate sensors.

Sensor Information Screen

• See status of all sensors and speed controls at a glance

• Check battery voltage and accelerometer operation

Calibration Screen

• Calibrate accelerometers and camera gimbal

• Review instructions for compass sensor and DX4 transmitter calibration

• Adjust geo-referenced fl ight boundaries

GPS Screen

• See number of available satellites and signal strength

• Verify latitude, longitude and altitude indications

• Verify GPS accuracy

Device Information Screen

• See programming software version

• See quad fi rmware version and vehicle ID

• Update fi rmware

*Requires USB Interface (BLH7840) sold separately.
15 EN

Parts of the 350 QX3

LED Indicator

LED Indicator

Flight Battery Door

Power Switch

Power Switch

CGO2

Camera/Gimbal

(AP Combo)

Camera LED

Camera Lens

Wi-Fi Antenna

GPS Antenna Mast

Front

Back

Bottom
©2015 Horizon Hobby, LLC.

Blade, SAFE Circle, the SAFE logo, the BNF logo, E-fl ite, Celectra, DSM, DSMX, EC3

and the Horizon Hobby logo are trademarks or registered trademarks of Horizon Hobby, LLC.

The Spektrum trademark is used with permission of Bachmann Industries, Inc.

US 7,391,320. Other patents pending. 

Created 11/14 46736.1 EN