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 QX2 are not compatible with any other product, and the 350 QX2 is not compatible with any other ESCs. Use of any other 

ESCs on the 350 QX2 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 

The Blade 350 QX2 has many more features than other Blade quadcopters. Please take the time to read this manual and understand the functions this aircraft 

contains before fl ying.
3 EN

®

Table of Contents

Components

Airframe Blade 350 QX2 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

Specifi cations

Length 18.30 in (465mm)

Height 7.48 in (190mm)

Main Rotor Diameter 22.80 in (580mm)

Flying Weight 35.5 oz (760 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

Transmitter Setup (BNF) ......................................................................................5

Mounting a Camera ............................................................................................6

Connecting the Flight Battery ..............................................................................7

Transmitter Control Layout (RTF) .........................................................................7

Power On ............................................................................................................7

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

Flight Mode Switches (RTF) .................................................................................9

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

Audible Alerts and LED Codes ...........................................................................10

GPS Functionality of the 350 QX2 ......................................................................12

Flight Guidelines and Warnings .........................................................................13

Preparing the 350 QX2 for Flight .......................................................................13

Flying the 350 QX2 ...........................................................................................14

Airframe Maintenance.......................................................................................15

Compass Calibration .........................................................................................16

Pressure Sensor Calibration ..............................................................................16

Accelerometer Calibration .................................................................................16

ESC and Motor Assignment Procedure ..............................................................17

Troubleshooting ................................................................................................17
EN 4

Box Contents

• Blade® 350 QX2 

• 3000mAh 3S 11.1V 20C Li-Po Battery

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

• SpektrumTM DX4 DSMX® 4-Channel Transmitter (RTF)

• 4 AA Batteries (RTF)

• Camera Mount

Charging Warnings

The Battery Charger (EFLC3016) included with your quadcopter has been

designed to safely charge the Li-Po battery.

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.

• By handling, charging or using the included Li-Po battery, you assume all risks 

associated with lithium batteries.

• If at any time the battery begins to balloon or swell, discontinue use immediately. If charging or discharging, discontinue and disconnect. Continuing to 

use, charge or discharge a battery that is ballooning or swelling can result in 

fi re.

• Always store the battery at room temperature in a dry area for best results.

• Always transport or temporarily store the battery in a temperature range of 

40–120o F (5–49° C). Do not store battery or model in a car or direct sunlight. 

If stored in a hot car, the battery can be damaged or even catch fi re.

• Always charge batteries away from fl ammable materials.

• Always inspect the battery before charging.

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

charges.

• Always constantly monitor the temperature of the battery pack while charging.

• ONLY USE A CHARGER SPECIFICALLY DESIGNED TO CHARGE LI-PO BATTERIES. Failure to charge the battery with a compatible charger may cause a fi re 

resulting in personal injury and/or property damage.

• Never discharge Li-Po cells to below 3V under load.

• Never cover warning labels with hook and loop strips.

• Never leave charging batteries unattended.

• Never charge batteries outside recommended levels.

• Never charge damaged batteries.

• Never attempt to dismantle or alter the charger.

• Never allow minors to charge battery packs.

• Never charge batteries in extremely hot or cold places

(recommended between 40–120° F) or (5–49° C) or place in direct sunlight.

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.
5 EN

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.

Charging the Flight Battery

Charger Specifi cations

• Input Voltage: 10.5–15V DC

• Charge Current: 3.5A

LED Indications

Green Blinking: Ready to Charge

Red Blinking: Charging

Red & Green Blinking: Cell Balancing

Green Solid: Charging Complete

Red Solid: Error

CAUTION: Overcharging a battery can cause 

a fi re.

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

* Old versions of the DX4e and DX5e (with 2-position channel 5 switches) are not recommended for the 350 QX2. Only Smart Mode and Stability Mode will be available with GPS On.

Transmitter Setup

CAUTION: When using a Futaba transmitter with a Spektrum DSM module, you must reverse the throttle channel and rebind. Refer to your Spektrum module manual for binding 

and failsafe instructions. Refer to your Futaba transmitter manual for instructions on reversing the throttle channel.

Transmitter Model 

Type

Reverse 

Setup

Throttle Cut 

Setup

Mode Setup Switch Positions Throttle Cut Return Home

DX4e (New)*

w/3-position 

switch

N/A N/A N/A N/A

Position 0 = SMART Mode Lower throttle trim 

until motors stop 

turning

Press and Hold TRAINER/

BIND Release to EXIT Position 1 = AP Mode

Position 2 = Stability Mode

DX5e (New)*

w/3-position 

switch

N/A N/A N/A N/A

Position 0 = SMART Mode Lower throttle trim 

until motors stop 

turning

Press and Hold TRAINER/

BIND Release to EXIT Position 1 = AP Mode

Position 2 = Stability Mode

DX6i Acro

THRO-N

ELEV-N

GEAR-R

AILE-N

RUDD-N

FLAP-N

ACT

Travel Adj: GEAR POS (0) GEAR: ↑100%;

GEAR/F MODE POS (1) GEAR: ↓40%

FLAPS: Norm ←↑100; LAND ↓100

MIX 1: ACT; GEAR → GEAR ACT

 RATE D 0%; U + 100%

 SW MIX TRIM INH

SUB TRIM THRO ↑ 15-20%

GEAR 0; Mix 0 = SMART Mode

Press throttle cut

FLAP Position 0 = OFF

FLAP Position 2 = Return 

Home

GEAR 1; Mix 0 = AP Mode

GEAR 1; Mix 1 = Stability Mode

DX7/7SE Acro FLAP-R (6)

Others-N N/A

Travel Adj: GEAR (0)↑100%;

GEAR (1) ↓40%

MIX 1: FLAP → Gear OFF/ON

 RATE → -50%

 0%

 SW: MIX OFFSET: 0

GEAR (0); Mix (0) = SMART Mode

Lower throttle trim 

until motors stop 

turning

FLAP Pos 0

= OFF

FLAP Pos 1

= Return Home

GEAR (1); Mix (0) = AP Mode

GEAR (1); Mix (1) = Stability Mode

DX7S Acro AUX1-R

Others-N

Set To: 

Trainer

Switch Select:

Move Gear to F MODE (F MODE:GEAR)

Leave FLAPS as AUX1

Set All Others to INH

MIX 1: GER > GER

RATE: 0%

 -100%

OFFSET: 0%; TRIM: INH; SW: Mix0

F MODE (0) = SMART Mode

Press

Trainer

FLAP Pos 0 = OFF

FLAP Pos 2 = Return 

Home

F MODE (1) = AP Mode

F MODE (1); HOLD (1) = Stability Mode

DX8 Acro AUX1-R

Others-N

Set To: 

Trainer

Switch Select: F-Mode to Gear;

 Flap to Aux 1

 All Others to INH

F MODE (0) = SMART Mode

Press Trainer/Bind

FLAP Pos 0

= OFF

FLAP Pos 2

= Return Home

F MODE (1) = AP Mode

F MODE (2) = Stability Mode

DX6/DX9/DX18 Acro AUX1-R

Others-N

Set To:

I (BIND)

Channel Assign: NEXT

1-4: N/A 5 Gear: B

6 AUX1: H 7-10: INH

B (0) = SMART Mode

Press I (BIND)

D (FLAP) Pos 0 = OFF

D (FLAP) Pos 2 = Return 

Home

B (1) = AP Mode

B (2) = Stability Mode
EN 6

IMPORTANT: Consult local laws and ordinances before installing and operating any type of photograph-capable or video recording device in this product.

Mounting a Camera

1 2

Installing the Included Camera Frame to the Isolation Mount

* Camera not included

Copper Foil Sheilding Instructions

Assembling the Isolation Mount

*

The Blade® 350 QX2 includes two adhesive-backed,

metal-foil sheets to provide GoPro® users with an 

extra measure of RF-shielding.

A B

B 2 3 4

1. Fold the inner “T” sheet (A) around the

camera with the metallic side facing away 

from the camera so it covers the top, sides 

and back. DO NOT peel off the backing.

2. Peel the backing off the rectangular sheet (B).

3. Wrap sheet B around the back of sheet A,

sealing all the rear edges and holding

everything together.

4. The shield is removable and is held in place 

by the 350 QX2 camera mount.

The front and bottom of the camera are left 

unshielded to allow any RF noise to radiate out 

and away from the 350 QX2.

A

1 A

B

DO NOT peel off 

the backing

WARNING: Always disable Wi-Fi before fl ying the Blade 350 QX2 with a GoPro camera. If Wi-Fi is not disabled, interference may cause loss of control,

which could result in a crash.
7 EN

Connecting the Flight Battery

1

4

2

3

1

2

3

Transmitter Control Layout

Mode Switch

0 - Smart Mode

1 - AP Mode

2 - Stability Mode

Return Home Switch

Aileron/Roll

(Modes 2 and 1)

Bind Button/

Motor Stop

Elevator/Pitch

(Mode 2)

Throttle/Altitude

(Mode 1)

Rudder/Yaw

(Modes 2 and 1)

Throttle/Altitude

(Mode 2)

Elevator/Pitch

(Mode 1)

Power Switch

4

Power On

1

2

3

Transmitter

(Mode 2) 350 QX2

RTF

Throttle
EN 8

Binding

The transmitter is bound to the model at the factory. If 

for any reason the model needs to be re-bound, follow 

the directions below.

The Binding Process

1. With the transmitter and quadcopter powered off, 

connect the battery to the 350 QX2.

2. With the 350 QX2 on a level surface, turn on the 

power switch and allow the quadcopter to initialize.

3. Wait until the blue LED on the quadcopter fl ashes 

rapidly, signaling the quadcopter is initialized and 

ready to bind.

4. Ensure the throttle is in the low position. Hold the 

control sticks in the desired bind position

(see illustrations) and press and hold the bind button, then power on the transmitter.

5. Refer to the Flying LED Codes table to ensure the 

aircraft is bound correctly.

Normal Bind

Yaw left Roll left

Yaw right Roll right

Bind in compass calibration mode Bind with GPS enabled

Bind in pressure calibration mode Bind with GPS disabled

Bind button

IMPORTANT: Do not attempt to bind with more than 

one bind code. Binding with more than one bind code 

will only allow the aircraft to bind normally.

Unless binding with a bind code, the elevator and 

aileron inputs must be neutral during binding. If you 

are attempting a normal bind with any input other than 

neutral, the aircraft will emit a constant, rapid beeping 

sound.

Transmitter Bind Codes (Mode 2 shown)

Entering Bind Mode
9 EN

Flight Mode 1– AP Mode

(Solid Purple Indicator LED)

• Position Hold– The aircraft will hold its position when elevator and aileron inputs are at neutral.

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

when the elevator and aileron inputs are at neutral.

• Altitude Command– Altitude is relative to throttle 

stick position.

Flight Mode 2– Stability Mode

(Solid Blue Indicator LED)

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

attitude when the elevator and aileron inputs are at 

neutral.

• Position Hold– The 350 QX2 uses GPS to hold a 

given location when this function is activated. If GPS 

is enabled and has a solid lock, the aircraft will hold 

its position when elevator or aileron inputs are at 

neutral.

• Throttle provides proportional thrust– The throttle 

responds directly to the throttle input, giving the pilot 

direct control over hovering as well as ascent and 

descent rates.

Flight Modes Explained

Flight Mode 0– Smart Mode (Default)

(Solid Green Indicator LED)

• Stick Relativity– While in Smart Mode, the 

path of the aircraft will always follow the control stick 

input direction relative to the SAFE Circle, regardless 

of the direction the nose of the aircraft is pointing. 

• SAFE CircleTM– 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 QX2 to a level attitude 

when the elevator and aileron inputs are at neutral.

• Altitude Command– Altitude is relative to throttle 

stick position.

Stick Relativity

SAFE CircleTM

Aircraft response 

relative to the 

pilot location

Elevator input Aileron input

Forward

Left Right 

Back

NOTICE: Do not attempt to fl y your 350 QX2 in Stability Mode or AP Mode until you have familiarized yourself with the operation of the aircraft in Smart Mode

and read and understand the descriptions of the other fl ight modes. 

Left aileron Right aileron

Forward elevator

Back elevator

The Blade 350 QX2 fl ies very differently in the different fl ight modes. Beginners 

should use Smart Mode to start and progress slowly into Stability Mode. When 

fl ying in Smart Mode, the quadcopter follows stick input based on the set pilot location. When fl ying in Stability Mode, the quadcopter follows stick inputs based on the 

orientation of the aircraft. The transition from Smart Mode to Stability Mode can be 

a challenge for new fl yers because the pilot will need to learn how to interpret the 

aircraft’s orientation.

For pilots new to quadcopters and helicopters, familiarize yourself with the

Blade 350 QX2 in Smart Mode.

Flight Mode Switches

Smart Mode

(Solid Green LED on the 350 QX2) Return Home

(Rapid Red fl ashing LED

on the 350 QX2)

AP Mode

(Solid Purple LED on the 350 QX2)

Stability Mode

(Solid Blue LED on the 350 QX2)

GPS Enabled Functions

AP and Stability Mode Control Inputs
EN 10

Startup LED Codes

1 second 1 second

Sequence

Initialization failed Pulsing red

IMU initialization Red, green and blue fl ash once

Fully charged battery Green (~2 second duration)

Fully discharged battery Red (~2 second duration)

Return to home mode activated Rapid red fl ashing

The quadcopter is in Bind mode Rapid blue fl ashing

Emergency mode

(cycle power to reinitialize) White fl ashing

Partial battery charge Color indicates level of battery charge

(~2 second duration)

1 second

The motors will beep under the following conditions:

• Any time the props stop spinning after they have 

been initialized. 

• After 30 seconds of no throttle input

(waiting armed on the ground).

Audible Alerts and LED Codes

Audible Alerts

Initialization Audible Alerts

Event Audible Alert

ESC power on one short beep

Successful initialization many continuous tones with increasing frequency

RC signal detected after start one long tone

Bind detected one long tone

Bind accepted (3 seconds after detected) one long tone

Throttle stick in correct position for motor start low, med, high (happy tone)

Cannot start motors because of low voltage high, med, low (sad tone)

Cannot start motors because vehicle is tilted high, med, low (sad tone)

Enter ESC ID assignment mode loud high, low — high, low

GPS Lock Acquired/Lost 3 short beeps, pause, then 3 short beeps

Event Audible Alert

Gyro, accelerometer sensor error High, low, 1 short tone

Compass initialization error High, low, 2 short tones

Pressure sensor initialization error High, low, 3 short tones

GPS initialization error High, low, 4 short tones

ESCs not detected High, low, 6 short tones

Settings saved (i.e. when changed GPS on/off, etc) Rapid low, med, high — low, med, high

Low-battery warning Medium frequency, loud tone (every 3 seconds)

Emergency state warning

(also after ESC ID assignment)

Once per second loud medium tone
11 EN

CAUTION: If you see the LED signal for low battery, immediately land your aircraft and recharge the battery.

CAUTION: Do not attempt to use Return Home with a low battery.

Flight battery voltage below 10.9V

Compass calibration needed*

Red, green and blue fl ash (~3 second cycle)

Flight battery voltage below 10.6V Red, green and blue fl ash (~1 second cycle)

Flying LED Codes

Calibration LED Codes

Smart Mode, with GPS lock

Gyro temperature calibration*

Smart Mode, no GPS lock

No calibration

3 green fl ashes, pause

Green pulsing

Stability Mode, with pressure

Compass calibration entered

Slow green fl ash

Slow red and green fl ashing

AP Mode, with GPS lock

Compass calibration started

Solid purple

Rapid red and green fl ashing

AP Mode, no GPS lock

Pressure sensor temperature calibration

3 purple fl ashes, pause

Rapid red and blue fl ashing

AP Mode, GPS disabled

Pressure and gyro calibration*

Slow purple fl ash

Rapid red, green and blue fl ashing

Stability Mode, with GPS lock

Accelerometer offset calibration entered

(in fl ight only)

Accelerometer offset calibration started

(in fl ight only)

Calibration failed

* These items are performed by the manufacturer.

*The LED may randomly fl ash orange. Unless it is repeated in the pattern 

above, compass calibration is not needed.

Solid blue

Slow red, green and blue fl ashing

Stability Mode, no GPS lock 3 blue fl ashes, pause

Rapid red, green and blue fl ashing

Solid white

Stability Mode, GPS disabled Slow blue fl ash

Slow orange fl ash

Flight mode set to Smart Mode

Flight mode set to AP Mode Shows fl ight mode position on motor startup

Flight mode set to Stability Mode

Solid green

Rapid green and blue fl ashing

1 second

1 second

1 second

1 second

Sequence

Sequence

1 second

1 second
EN 12

GPS Functionality of the 350 QX2

To acquire a reliable GPS signal, it is important the 350 QX2 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 lose or cannot acquire a GPS lock and home position, the aircraft will not 

have Stick Relativity, SAFE Circle, Position Hold or Return Home functions available.

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

350 QX2 is initialized without GPS enabled, it will default to Stability Mode. The 

aircraft will still be capable of altitude command. 

If you do not have a GPS signal, try maneuvering the 350 QX2 by steering with 

forward elevator and rudder only.

CAUTION: Do not attempt to fl y the 350 QX2 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 QX2 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 QX2 should lose GPS when Return Home mode is activated, it will 

land quickly using the barometric pressure sensor to maintain the descent 

rate.

• If the 350 QX2 took off without GPS lock, but acquires a GPS signal in fl ight, 

it will land slowly using GPS to hold its position and barometric pressure 

sensor to maintain the descent rate when Return Home mode is activated.

• If the 350 QX2 loses GPS during landing in Return Home mode, it will 

increase the rate of descent and land quickly to avoid drift.

• If the 350 QX2 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. This could happen if the fl ight control system loses its 

orientation because of aggressive fl ight in 3 axis mode.

• Once the 350 QX2 has landed in Return Home mode, it will disarm the 

motors.

With GPS OFF

• If Return Home mode is activated, the 350 QX2 will level off and land 

quickly using the barometric pressure sensor to maintain the descent rate.

• Once the 350 QX2 has landed in Return Home mode, it will disarm the 

motors.

GPS Failure

Upon GPS failure, the 350 QX2 will respond according to the following conditions:

Smart Mode: (rapid Green fl ashing LED)

If the 350 QX2 is in this mode and the GPS fails, the quad will default to 

Stability Mode. The aircraft will still use the pressure sensor to maintain

altitude and control rate of descent. If GPS is reacquired, after 5–10 seconds 

of reliable GPS signal the Smart Mode functions are returned to normal 

AP Mode: (long Purple, two short Green fl ashing LED)

If the 350 QX2 is in this mode and the GPS fails, it will not switch

to Smart Mode and will not enter GPS hold, but will otherwise function 

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

the AP Mode functions are returned to normal.

Stability Mode: (long Blue, two short Green fl ashing LED)

If the 350 QX2 is in this mode and the GPS fails, it will not switch to Smart 

Mode and will not enter GPS hold, but will otherwise function normally. If 

GPS is reacquired, after 5–10 seconds of reliable GPS signal the Stability 

Mode functions are returned to normal.

Loss of Transmitter Signal

If the transmitter signal is lost for any reason, the 350 QX2 will respond according to the following conditions:

• If the motors are not turning, the 350 QX2 will disarm.

• If the motors are turning but the 350 QX2 is not fl ying, it will turn off the 

motors and disarm. 

• If the 350 QX2 is fl ying and has a good GPS lock with a home position set, 

it will activate the Return Home function upon the loss of the transmitter 

signal. 

• If the compass is not connected or faulty, or if there is no GPS lock, the 350 

QX2 will descend slowly upon the loss of the transmitter signal.

• If the pressure sensor is not working, the 350 QX2 will reduce power to initiate a controlled descent upon the loss of the transmitter signal. 
13 EN

Flight Guidelines and Warnings

• 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.

Preparing the 350 QX2 For Flight

CAUTION: When the home location is set (step 6), the 350 QX2 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 and the throttle stick down.

2. Install a charged battery, plug it in and close the hatch.

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

switch and allow the 350 QX2 to initialize.

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

acquired, which is indicated by a solid green LED. It 

may take from 30–90 seconds to acquire a GPS signal.

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. When you are prepared to fl y, you have two options to 

start the motors:

• Move the rudder stick full left, then full right, then 

back to center.

• 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 and hold the bind button for

1 second to power off the props after fl ight.

16 feet (5 meters)

350 QX2 home location

Pilot location

SAFE CircleTM

Smart Mode Flying Front

LED
EN 14

Flying the 350 QX2

Takeoff

Increase the throttle slightly above low stick (10–15%). 

The 350 QX2 altitude in Smart Mode corresponds 

to the throttle position. Low throttle is on the ground, 

slightly raising the throttle will produce a low hover, 

and the higher the throttle position, the higher the 350 

QX2 will ascend until it reaches its maximum altitude 

(approximately 45 meters).

Explore the fl ight envelope of the 350 QX2 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 and Stability Mode operate more 

like a conventional RC helicopter or multicopter.

Maximum altitude

(approximately 45 meters)

Intermediate altitude

On the ground

Full throttle

Half throttle

Low throttle

Mode 2 shown

Smart Mode Altitude Control

Return Home

• When this feature is activated, the 350 QX2 

will fl y back to its assigned home location 

and land. After landing, the motors may take 

up to 5 seconds to disarm. If the motors take 

more than 20+ seconds to disarm, perform 

the Pressure Sensor Calibration.

• To restart the props after landing in Return Home, 

fully lower the throttle, then quickly move the rudder 

stick fully left and then fully right.

CAUTION: The 350 QX2 will not recognize the 

SAFE Circle feature when Return Home is used. 

Activating Return Home may cause the 350 QX2 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.

Switch to position 1.

Returning the switch to position 0 

will stop the Return Home program.

Landing

To land the 350 QX2 there are two options: 

• Guide the aircraft to where you wish to land and reduce the throttle. Hold the bind button for 1 second 

after landing to disarm the motors.

• Activate the Return Home function to return the

350 QX2 to the assigned home location and land 

automatically.

CAUTION: Do not activate the Return Home

function if the 350 QX2 is showing the low

battery indication. Manually land the aircraft

immediately.

After Your Flight

1. Turn off the power switch on the 350 QX2.

2. Turn off the power to your transmitter.

3. Unplug and remove the battery from the 350 QX2.

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.

RTF Activating Return Home 
15 EN

Airframe Maintenance

Replacing the body

Disassembly of the old airframe

1. Ensure the battery is disconnected from the

quadcopter. 

2. Remove the 2 machine screws from each propeller 

and remove the propellers. 

3. Remove the 32 1.5mm hex screws from the bottom 

of the frame to separate the upper and lower body 

pieces.

4. Unplug the compass sensor from the fl ight control 

board. Remove the landing gear with compass sensor and place it in a safe area away from magnets. 

NOTICE: Do not allow the compass sensor to

get near a magnet. Any magnet, including those in 

the 350 QX2 motors, can damage the compass and 

cause it to work incorrectly. If the 350 QX2 is fl own 

with a faulty compass, all GPS functions will be 

compromised. 

5. Unplug the GPS receiver from the fl ight control 

board and remove the battery tray assembly.

6. If you are replacing the GPS components, remove 

the foil from the GPS receiver and unplug the GPS 

antenna from the GPS receiver. 

7. Remove the fl ight control board from the airframe.

8. Remove the receiver.

9. Remove the motors and ESCs from the airframe.

Before installing the components into the new airframe, 

inspect all the components for any obvious damage or 

burnt smells. Check the motors for smooth bearings 

and inspect all the propellers for chips, burrs or cracks. 

Replace any parts in question. 

Installing components in the new airframe

1. Install the motors and ESCs, making sure to match 

the wire colors on the connectors.

2. Install the receiver.

3. Install the fl ight control board.

4. Install the tray assembly.

5. Install the GPS receiver and GPS antenna and plug 

the cables into their corresponding sockets.

6. Assign the motors and ESCs according to the

ESC and Motor Assignment Procedure.

7. Install the landing gear and connect the compass 

to the fl ight control board. If you replaced the 

compass or believe that it may have been impaired 

by a magnetic fi eld, you will need to perform the 

compass calibration procedure. 

8. Mount the top of the airframe.

9. Install the propellers, paying attention to the

direction of rotation as indicated by the arrows 

molded in the frame and on the propellers for each 

motor.

Body Screw

Locations

Propeller Direction of Rotation Indicators

Internal Components

Motors

ESCs

GPS receiver

GPS antenna

Battery tray assembly

Flight control board

Rotation 

direction

Motor number
EN 16

Compass Calibration Steps

Compass Calibration

Pressure Sensor Calibration

Accelerometer Calibration

The Flight Controller on the 350 QX2 has automatic magnetic declination calibration, so you will not have to worry about looking up the magnetic declination at your 

location and changing settings on your 350 QX2 to get accurate compass measurements. The status LED blinks orange if the compass senses a magnet or metal object 

nearby. A random orange fl ash of the LED is considered normal, and not cause for 

compass calibration. When the Status LED blinks a consistent pattern of orange, 

compass calibration should be performed using the procedure below.

Compass calibration procedure:

1. Go to an open space outdoors away from metal. Take a conventional compass 

with you to ensure you know the direction of north.

2. Ensure your transmitter is off and then connect a fl ight battery to the 350 QX2. 

Power the aircraft on. Wait fi ve seconds and then the blue LED will begin fl ashing rapidly, signaling the aircraft is initialized and ready to bind.

3. Once the blue light begins fl ashing, bind with yaw stick left. The 350 QX2 LED 

will slowly fl ash between red and green for 5 seconds. 

4. Put the 350 QX2 fl at in your hands and face north. After 5 seconds of slow 

fl ashing, the quad will start fl ashing rapidly. The quad is now collecting data to 

be used for the calibration.

5. Slowly rotate the quad 360 degrees about the east-west axis (“fl ip” the aircraft 

either forward or backward) until it is fl at in your hands again. 

6. Continue facing north and yaw the quad 45 degrees left so the quad is now 

facing north-west.

7. Slowly rotate the quad 360 degrees about the east-west axis,

(“fl ip” the aircraft diagonally either direction) until it is fl at in your hands again.

8. Continue facing north and yaw the quad 45 degrees left so the quad is now 

facing west. 

9. Slowly rotate the quad 360 degrees about the east-west axis

(“fl ip” the quad sideways either direction) until it is fl at in your hands again.

10. Continue facing north and yaw the quad 45 degrees left so the quad is now 

facing south-west. 

11. Slowly rotate the quad 360 degrees about the east-west axis

(“fl ip” the aircraft diagonally either direction) until it is fl at in your hands again.

You have 30 seconds to complete the procedure. The 350 QX2 should still be blinking 

rapidly when you fi nish. Hold the aircraft still until it stops blinking rapidly. If successful, the 350 QX2 will beep a positive confi rmation and then restart itself.

If unsuccessful, the 350 QX2 displays the failed calibration code, a solid white LED. 

If the 350 QX2 displays this error code, power off the aircraft and then begin the 

calibration procedure again. 

The pressure sensor is calibrated at the factory on the 350 QX2. Recalibration 

should only be necessary if you replace the sensor. 

1. Place the 350 QX2 in a cold area. Allow it to remain in the cold for 30 minutes 

or more. 

2. Bring the 350 QX2 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 QX2 and power the aircraft on. Wait fi ve seconds and then the blue LED will 

begin fl ashing rapidly, signaling the aircraft is initialized and ready to bind.

4. Once the blue light begins fl ashing, bind with yaw stick right. The

350 QX2 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.

5. 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 QX2 displays the failed calibration code, power off the aircraft and then 

begin the pressure calibration procedure again. 

To calibrate the accelerometer, the quadcopter needs to fl y for 20 seconds while 

being level. This allows the accelerometer readings to be averaged and stored in 

memory.

Use the following procedure to calibrate the accelerometer:

1. Power on the quadcopter with the transmitter off to enter bind mode.

2. Turn on the transmitter while holding the elevator stick back and pressing 

the bind switch.

3. Set the fl ight mode switch to AP Mode or Smart Mode. The quadcopter will 

fl y in AP Mode no matter which position is selected.

4. Start the motors. Fly the quadcopter off the ground. The quadcopter LED will 

fl ash slowly (red, green, blue).

5. Activate the accelerometer calibration mode by changing the fl ight mode 

switch into Stability Mode. The vehicle will still fl y in AP Mode. The LED will 

start fl ashing quickly (red, green, blue).

6. Fly steadily for 10–30 seconds. The LED will fl ash slowly when data

collection is done.

7. Land the quadcopter and stop the propellers by lowering the throttle and

holding the bind button for 1 second.

IMPORTANT: The calibrated values are not yet permanently stored. Do not turn 

off the quadcopter.

8. Start the motors and verify the quadcopter fl ies without drifting.

9. Land the quadcopter and stop the motors by lowering the throttle and

holding the bind button for 1 second.

10. Save the calibration by moving the rudder stick quickly left, right, left, right. 

Values are saved when you hear a rapid triple tone twice.

11. Turn off the quadcopter.

12. Confi rm the calibration by powering up the quadcopter and performing a test 

fl ight. If the calibration is not correct, start the calibration procedure again.

North

Step 5 Step 7 Step 9 Step 11
17 EN

Troubleshooting

Problem Possible Cause Solution

350 QX2 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

Camera is on Turn the camera off, allow the GPS to acquire and then power the camera on.

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 fl ipping into other modes

Motors will not start in

Smart Mode GPS signal is not aquired Ensure a GPS signal is aquired

Blades 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

The quadcopter has trouble 

fi nding the home position and 

the props will not shut off after 

returning home

Accelerometer calibration is needed Refer to the Accelerometer Calibration section of this manual

ESC and Motor Assignment Procedure

Motor Numbers 1. Begin with the transmitter off and connect a fl ight

battery to the 350 QX2.

2. Power on the quadcopter on a level surface and wait 

for the rapid blue fl ashing LED to indicate the aircraft 

has entered bind mode.

3. With the throttle stick in the full throttle position, 

press/pull the bind button/switch and power on your 

transmitter. The quadcopter will acknowledge the assignment mode with a loud high, then low tone. If your 

transmitter is equipped with a high throttle warning 

at startup, it is necessary to disable this alarm prior to 

completing this step. After the replacement procedure 

is complete, re-activate the high throttle warning in 

your transmitter.

4. The motor number and prop direction are molded in 

the top of the body. The motors will give an audible 

“beep” to indicate which motor to calibrate. When the 

motors beep 1 time, spin motor 1 by hand. The motor 

will respond with the same number of tones upon 

successful assignment. 

5. When the motors beep 2 times, spin motor 2 by hand.

6. When the motors beep 3 times, spin motor 3 by hand.

7. When the motors beep 4 times, spin motor 4 by hand.

When the assignment is successful, the quadcopter 

enters emergency mode. Restart the quadcopter.

Motor number 1

Motor number 4

Motor number 2

Motor number 3
©2014 Horizon Hobby, LLC.

Blade, SAFE, SAFE Circle, the SAFE logo, the BNF logo, E-fl ite, DSM, DSM2, DSMX,

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.

GOPRO® is a registered trademark of Woodman Labs, Inc. in the United States and other countries. All other trademarks, service marks and 

logos are property of their respective owners.

US 7,391,320. Other patents pending. 

Created 6/14 45967