Horizon Hobby Blade 350 QX3 Quadcopter User manual

INSTRUCTION MANUAL
®

2
EN
• Always keep a safe distance in all directions around your model to avoid colli-
sions 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, traffic
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 specifically 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 sup-
port 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 prob-
ability of superficial 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 fly your aircraft.
FAA Website: http://www.faa.gov/
AMA Website: http://www.modelaircraft.org/

3EN
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 Spektrum™DX4 DSMX®4-Channel Transmitter (RTF, AP Combo)
Camera/Gimbal CGO2 GB 1080p HD (AP Combo)
Specifications
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

4
EN
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 fire 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 first, 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 (–) cor-
rectly.
• 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 Cuto (LVC)
Low voltage cutoff (LVC) protects the Li-Po battery from over-discharge in flight
and activates when the battery reaches a preset value. When the battery is
discharged to the cutoff point, the aircraft will display rapidly flashing 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 flying 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 flight. 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

5EN
Charging the Flight Battery
Charger Specifications
• 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 fire, 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
23
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 )

6
EN
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
bd
c

7EN
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
Flaps: FLAP
Norm ↑100
land ↓100
Mix 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)
GIMBAL control = FLAP (POS 1),
Throttle controls gimbal angle
Accelerometer calibration = Set FLAP to POS 0 and cycle
Flight Mode switch 4 times
Compass calibration = Set FLAP to POS 10 and cycle
Flight Mode switch 4 times
DX6
airplane Channel Assign:
Channel Input
Cong
(2nd page):
Gear: B
AUX1: A
Servo setup:
AUX1 - R
All others - N
Throttle cut:
Position:
–130%
Switch: Switch i
Servo setup:
Travel:
120%
140%
AX1
Smart Mode = Switch B ( POS. 0)
AP MODE = Switch B (POS 1)
Return Home = Switch B (POS. 2)
GIMBAL Control = Switch A (POS 1),
Throttle controls gimbal angle
Compass calibration = Switch A (POS 1) and
cycle B switch 4 times
Accelerometer calibration = Switch A (POS 0) and
cycle B switch 4 times
DX7s
airplane Knob: AUX2
Gear: AUX1
Flap: Gear
Servo setup:
All NORM
Throttle cut:
0% Trainer
Servo setup:
Travel:
Aux1 120% 140%
Smart Mode = Flap switch ( POS. 0)
AP MODE = FLap switch (POS 1)
Return Home = Flap switch (POS. 2)
GIMBAL Control = Gear switch (POS 0),
Knob controls gimbal angle
Compass calibration = Gear switch (POS 0) and
cycle FLAP switch 4 times
Accelerometer calibration = Gear switch (POS 1) and
cycle FLAP switch 4 times
DX8
airplane Gear: AUX1
Knob: AUX2
F Mode: Gear
Servo setup:
All NORM
Throttle cut:
0% Trainer
Servo 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)
GIMBAL Control = Gear switch (POS 0),
Knob controls gimbal angle
Compass calibration = Gear switch (POS 0) and
cycle FLAP switch 4 times
Accelerometer calibration = Gear switch (POS 1) and
cycle FLAP switch 4 times
DX9/DX18
airplane Channel Assign:
Channel Input
Cong (2nd page):
Gear: B
AUX1: A
AUX2: R Knob
Servo setup:
All NORM
Throttle cut:
Position:
–130%
Switch: Switch i
Servo setup:
Travel:
140%
120%
AX1
Smart Mode = Switch B ( POS. 0)
AP MODE = Switch B (POS 1)
Return Home = Switch B (POS. 2)
GIMBAL Control = A switch (POS 0),
Knob controls gimbal angle
Compass calibration = A switch (POS 0) and
cycle B switch 4 times
Accelerometer calibration = Gear switch (POS 1) and
cycle B switch 4 times

8
EN
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 flat 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
flashes 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 flash either green, purple or red, depending on
which flight mode is selected.
If the LED is flashing red, the 350 QX3 is in Return
Home mode. Switch to Smart or AP Mode (green
or purple flashing) before attempting to start the
motors.
9. Place the quadcopter outdoors in the desired
starting position in preparation for flight.

9EN
Flight Modes Explained
Smart Mode
This flight mode is intended for
the beginner pilot. For best re-
sults while using Smart Mode,
it is recommended the pilot
always turn to face the
350 QX3 while flying.
• 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 Circle™
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 informa-
tion to create a virtual barrier and will not travel
farther than 100 meters from the home position.
AP Mode
This flight 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 informa-
tion 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 flashing LED on the 350 QX3)
AP Mode Control Inputs
NOTICE: If the 350 QX3 loses GPS signal while flying in either Smart or AP Mode, the LED will flash either green or purple, depending on which flight mode you are
currently using, and the 350 QX3 will default to a stable flight 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

10
EN
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 flight)................................
GPS lost while in AP mode or return to home (in flight).........
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 flight (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 flying, the aircraft will not have Stick Relativity, the
SAFE Circle™feature, Position Hold or Return Home functions available. We recom-
mend maneuvering the 350 QX3 by steering with forward elevator and rudder only
if GPS signal is lost.
CAUTION: Do not attempt to fly 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 fly back to the start position
(maintaining altitude along the way), then reduce altitude to land.
• If the 350 QX3 loses GPS lock while flying in Smart, AP or Return Home
mode, the LED will flash green, purple or red, depending on which flight mode
you are currently using. The 350 QX3 will default to a stable flight 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 flight 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 flight, it will respond according to the
following conditions:
Smart Mode: (Green flashing LED)
If the 350 QX3 loses GPS signal in flight while in Smart Mode the LED will
flash 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 flashing LED)
If the 350 QX3 loses GPS signal in flight while in AP Mode the LED will flash
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 flying, it will stop the motors
and disarm.
• If the 350 QX3 is flying and has a good GPS lock with a home position set, it
will activate the Return Home function (rapid red flashing 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 flight.
• 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 flight, point-
ing 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 flight mode set to
Smart Mode.
2. Remove the battery hatch. Install a fully charged
battery pack, connect the blue EC3™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 fly.
Lower the throttle stick fully and hold the bind button to
stop the motors after flight.
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 flight 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 flying. If at any time
the LED indicates the flight battery voltage is low (below
10.6V), as shown In the LED code section, land the 350
QX3 immediately and charge the flight battery.
SAFE Circle™

12
EN
Return Home
NOTICE: Return home will only function if the
350 QX3 has GPS lock.
• When this feature is activated, the LED will rapidly
flash red.
• The 350 QX3 will fly back to its assigned home loca-
tion 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 flight
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
fly directly over the pilot if the aircraft was flown 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 bat-
tery from the aircraft when not flying 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
fire 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 flash white and the
motors will beep loudly.
b
a
Motor Stop

13 EN
North
4X
4X
abcd
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 flashing the LED orange.
5.When the LED begins to flash 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 flat, 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
flight 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
flashes 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

14
EN
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 flares 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 flight 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 firmware 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 flight 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 firmware version and vehicle ID
• Update firmware
*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-flite, 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