Horizon Hobby Viper 90mm EDF User manual

Viper 90mm EDF
Instruction Manual
Bedienungsanleitung
Manuel d’utilisation
Manuale di Istruzioni
EFL17770
EFL17750
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EN
Viper 90mm EDF
2
Safety Precautions and Warnings
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 or towerhobbies.com and click on the support or resources tab for this product.
AGE RECOMMENDATION: Not for children under 14 years. This is not a toy.
MEANING OF SPECIAL LANGUAGE
The following terms are used throughout the product literature to indicate various levels of potential harm when operating this product:
WARNING: Procedures, which if not properly followed, create the probability of property damage, collateral damage, and serious injury OR create a high probability of
superficial injury.
CAUTION: Procedures, which if not properly followed, create the probability of physical property damage AND a possibility of serious injury.
NOTICE: Procedures, which if not properly followed, create a possibility of physical property damage AND little or no possibility of injury.
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.
As the user of this product, you are solely responsible for operating in a manner that does not endanger yourself and others or result in damage to the product or the
property of others.
• 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, 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 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.
• Always ensure failsafe is properly set before flying.
• Never operate aircraft with damaged wiring.
• Never touch moving parts.
WARNING AGAINST COUNTERFEIT PRODUCTS: If you ever need to replace your Spektrum receiver 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 technology.

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Box Contents
Table of Contents
Specications
ARF
Plus
Motor: 3670–1950Kv Brushless Inrunner 4-pole
(SPMXAM1400) Installed Required
ESC: Avian™ 130 Amp Brushless Smart ESC (SPMXAE1130A)Installed Required
Servos: Aileron: (2) Spektrum SPMSA450;
Left Elevator: (1) Spektrum SPMSA450;
Right Elevator: (1) Spektrum SPMSA450R;
Rudder: (1) Spektrum SPMSA450R;
Nose Wheel Steering: (1) Spektrum SPMSA450
Installed Installed
Receiver: Spektrum™AR637TA 6-Channel AS3X/SAFE
Telemetry Receiver (SPMAR637T) Installed Required
Recommended Battery: 6S 22.2V 5000mAh 30C Required Required
Recommended Battery Charger: 6-cell Li-Po battery
balancing charger Required Required
Recommended Transmitter: Full range 6-channel 2.4GHz w/
Spektrum DSM2/DSMX®technology w/ adjustable Dual Rates Required Required
SAFE®Select Technology (BNF Basic)................................................................... 4
Preflight................................................................................................................ 4
Model Assembly ................................................................................................... 4
Receiver Installation (ARF Plus)............................................................................. 6
Transmitter Setup (BNF Basic).............................................................................. 6
Battery Installation and ESC Arming...................................................................... 7
Center of Gravity .................................................................................................. 7
General Binding Tips and Failsafe ......................................................................... 8
Transmitter and Receiver Binding / Enable or Disable SAFE
Select (BNF Basic)................................................................................................ 8
SAFE®Select Switch Designation.......................................................................... 9
Control Surface Centering..................................................................................... 9
Control Surface Direction.................................................................................... 10
Control Horn and Servo Arm Settings.................................................................. 10
Dual Rates and Control Throws........................................................................... 11
AS3X Control Response Test (BNF Basic)............................................................ 11
In Flight Trimming (BNF Basic)............................................................................ 11
Flying Tips and Repairs....................................................................................... 12
SAFE Select Flying Tips....................................................................................... 12
Power System Installation and Service................................................................ 13
Post Flight........................................................................................................... 13
Troubleshooting Guide AS3X ............................................................................... 14
Troubleshooting Guide ........................................................................................ 14
Replacement Parts.............................................................................................. 15
Recommended Parts........................................................................................... 15
Optional Parts..................................................................................................... 15
Recommended Receivers (ARF Plus)................................................................... 15
AMA National Model Aircraft Safety Code............................................................ 16
Limited Warranty ................................................................................................ 16
Contact Information ............................................................................................ 17
FCC Information.................................................................................................. 17
IC Information..................................................................................................... 17
Compliance Information for the European Union.................................................. 17
If you own this product, you may be required to register with the FAA.
For up-to-date information on how to register with the FAA, please visit
https://registermyuas.faa.gov/.
For additional assistance on regulations and guidance on UAS usage,
visit knowbeforeyoufly.org/.
Quick Start Information
Transmitter Setup Set up your transmitter
using the transmitter setup chart
Dual Rates
Low Rate High Rate
Aileron: Measured at
the inboard end
p= 11mm
q= 11mm
p= 16mm
q= 16mm
Elevator: Measured
at the inboard end
p= 10mm
q= 10mm
p= 14mm
q= 14mm
Rudder: Measured at
the base of the rudder
= 19mm
= 19mm
= 25mm
= 25mm
Center of Gravity (CG) 10mm (± 7mm) from the back edge
of the front plastic wing mounting structure
Flight Timer Setting 3.5 minutes
Without Battery
5.45lb (2473g)
With 6S 5000mAh Battery:
7.04lb (3193g)
50.43in (1281mm)
55.12in (1400mm)

Wing Installation
1. Turn the fuselage over.
2. Insert the shorter wing tube (530 mm x 12.6 mm) in the forward hole of the
fuselage.
3. Insert the longer wing tube (580 mm x 7.8 mm) in the rear hole of the
fuselage.
4. Slide the left wing panel into place on the wing tubes, ensuring the hands-free
connectors align and fully seat with one another.
5. Secure the wing to the fuselage with two 3 x 10 mm screws.
TIP: A 2.0mm hex wrench required. Do not over tighten the screws.
Repeat this process for the right wing panel.
3 x 10mm
3 x 10mm
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Viper 90mm EDF
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Preight
SAFE®Select Technology (BNF Basic)
The BNF Basic version of this airplane includes SAFE Select technology which can
offer an extra level of protection in flight. Use the following instructions to make the
SAFE Select system active and assign it to a switch. When enabled, SAFE Select
prevents the airplane from banking or pitching past predetermined limits, and
automatic self-leveling keeps the airplane flying in a straight and level attitude when
the aileron, elevator and rudder sticks are at neutral.
SAFE Select is enabled or disabled during the bind process, or it can be enabled
via Forward Programming. When the airplane is bound with SAFE Select enabled,
a switch can be assigned to toggle SAFE Select ON or OFF. AS3X®technology
remains active at all times.
SAFE Select can be configured three ways:
• SAFE Select Off: Always in AS3X mode
• SAFE Select On with no switch assigned: Always in SAFE Select mode
• SAFE Select On with a switch assigned
1. Remove and inspect contents.
2. Read this instruction manual thoroughly.
3. Charge the flight battery.
4. Setup the transmitter using the transmitter setup chart.
5. Fully assemble the airplane.
6. Install the flight battery in the aircraft (once it has been fully charged).
7. Check the Center of Gravity (CG).
8. Bind the aircraft to your transmitter.
9. Make sure the linkages move freely.
10. Test the flap and retract operation.
11. Perform the Control Direction Test with the transmitter.
12. Perform the AS3X Control Direction Test with the aircraft.
13. Adjust the flight controls and transmitter.
14. Perform a radio system Range Test.
15. Find a safe open area to fly.
16. Plan flight for flying field conditions.
Model Assembly
Horizontal Stabilizer Installation
1. Connect both elevator servo connectors to the extensions in the fuselage
labeled ELEV. Feed the excess servo wire into the fuselage.
2. Press the horizontal stabilizer onto the four stabilizer posts on the fuselage,
ensuring no servo wires are pinched.
3. Insert two 3 x 10 mm screws through the horizontal stabilizer and into the
rear holes in the fuselage.
TIP: A 2.0mm hex wrench required. Do not over tighten the screws.

Nose Cone Installation
Align and attach the nose cone to the fuselage. Magnets will secure the nose cone
in place.
3 x 10mm
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Vertical Stabilizer Installation
1. Connect the rudder servo connector to the extension in the fuselage labeled
RUDD. Feed the excess servo wire into the fuselage.
2. Press the vertical stabilizer into the slot in the horizontal stabilizer and the
fuselage, ensuring no servo wires are pinched.
3. Insert three 3 x 10 mm screws through the vertical stabilizer and into the
fuselage.
TIP: A 2.0mm hex wrench required. Do not over tighten the screws.
Ventral Fin Installation
1. Fit the left ventral fin into the fuselage and slide aft to secure.
TIP: The gray side should face in, and the detailed side should face out.
2. Fit the right ventral fin into the fuselage and slide aft to secure.

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Viper 90mm EDF
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Transmitter Setup (BNF Basic)
IMPORTANT: After you set up your model, always rebind the transmitter and
receiver to set the desired failsafe positions.
The GEAR Channel (CH 5) controls the retractable landing gear. If you are using a 6
channel transmitter, The FLAP Channel (CH 6) can be used to toggle SAFE Select.
With the values listed below it will turn SAFE on for half and full flap positions and
AS3X will be on for no flaps position.
To use the flap channel for the SAFE Select switch the values must be set to
+100 and -100 and the speed set to 0 temporarily to assign the safe switch in the
flap system menu. Then change the flap systems values back to the listing in the
TX setup. See the SAFE Select Switch Designation section of this manual to assign
the switch for SAFE Select.
Dual Rates
Attempt your rst ights in low rate. For landings, use high rate elevator.
NOTICE: To ensure AS3X technology functions properly, do not lower rate values
below 50%. If less control deflection is desired, manually adjust the position of
the pushrods on the servo arm
NOTICE: If oscillation occurs at high speed, refer to the Troubleshooting Guide
for more information.
Exponential
After first flights, you may adjust expo in your transmitter.
†Some of the terminology and function locations used in the iX12 and iX20
programming may be slightly different than other Spektrum AirWare™radios.
The names given in parentheses correspond to the iX12 and iX20 programming
terminology. Consult your transmitter manual for specific information about
programming your transmitter.
*Flap programming values may vary slightly. For your initial ights use
the recommended ap travel settings, and adjust the ap travel to your
preference on subsequent ights.
Computerized Transmitter Setup
Start all transmitter programming with a blank ACRO model (perform a model reset),
then name the model.
Set Dual Rates to HIGH 100% LOW 70%
Set Servo Travel to 100%
Set Throttle Cut to -100%
Set Retract Channel to Reverse
Set Aileron Expo to High Rate 10% Low Rate 5%
Set Elevator Expo to High Rate 10% Low Rate 5%
Set Rudder Expo to High Rate 10% Low Rate 5%
DXS Refer to spektrumrc.com for the appropriate download setup.
DX7S
DX8
1. Go to the SYSTEM SETUP
2. Set MODEL TYPE: AIRPLANE
3. Set WING TYPE: 1 AIL; 1 FLP
4. Set FLAP SYSTEM: Choose Flap
POS 0: 100% FLAP* 0% ELEVATOR
POS 1: 0% FLAP* -3% ELEVATOR
POS 2: -100% FLAP* -5% ELEVATOR
Switch: SWITCH D
Speed: 2.0S
DX6e
DX6 (Gen2)
DX7 (Gen2)
DX8e
DX8 (Gen2)
DX9
DX10t
DX18
DX20
iX12
iX20
NX6
NX8
NX10
1. Go to the SYSTEM SETUP (Model Utilities)†
2. Set MODEL TYPE: AIRPLANE
3. Set AIRCRAFT TYPE (Model Setup, Aircraft Type)†:
WING: 1 AIL; 1 FLP
4. Set CHANNEL ASSIGN (Model Setup, Channel Assign)†:
(Default switch assignments with a new model setup)
Gear (CH5): SWITCH A
5. Set FLAP SYSTEM:
Switch: SWITCH D
POS 0: 100% FLAP* 0% ELEVATOR
POS 1: 0% FLAP* -3% ELEVATOR
POS 2: -100% FLAP* -5% ELEVATOR
Speed: 2.0S
The Spektrum AR637T receiver is recommended for ths airplane. If you choose to install
another receiver, ensure that it is at least a 6-channel full range (sport) receiver. Refer to
your receiver manual for correct installation and operation instructions.
Installation (AR637T shown)
1. Mount the receiver parallel to the length of the fuselage as shown. Use heavy
duty double-sided servo tape.
NOTICE: Incorrect installation of the receiver could cause a crash.
2. Attach the appropriate control surfaces to the their respective ports on the
receiver using the chart in the illustration.
Receiver Installation (ARF Plus)
AR637 Port Assignments
BND/PRG = BIND
1 = Throttle
2 = Ailerons
3 = Elevator
4 = Rudder
5 = Retracts
6 = Flap

WARNING: Install the battery but do not connect it to the ESC while
checking the CG. Personal injury may result.
The CG location is 10mm (±7mm) from the back edge of the front plastic wing
mounting structure. Always check the CG location with model inverted, and the
landing gear down.
The CG location is adjusted by moving the battery pack forward or backward in the
battery compartment.
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Center of Gravity
Battery Installation and ESC Arming
Battery Selection
A 6S 4000–7000mAh LiPo battery is required. The Spektrum 5000mAh 22.2V 6S
30C LiPo battery (SPMX50006S30) is recommended. Refer to the Optional Parts
List for other recommended batteries. If using a battery other than those listed,
the battery should be within the range of capacity, dimensions and weight of the
Spektrum Li-Po battery packs to fit in the fuselage. Be sure the model balances
within the recommended CG range before flying.
1. Lower the throttle and throttle trim to the lowest settings. Power on the trans-
mitter, then wait 5 seconds.
2. Remove the battery hatch.
3. For added security, apply the loop side (soft side) of the optional hook and loop
tape to the bottom of your battery, and the hook side to the battery tray.
4. Install the fully charged battery in the center of the battery compartment as
shown. Secure using the hook and loop straps.
5. Connect the battery to the ESC. If you have not completed the bind sequence,
do so at this time as outlined in this manual.
CAUTION: Always keep hands and loose items away from the fan intake.
When armed, the motor will turn the rotor in response to any throttle
movement.
6. Keep the aircraft immobile and away from wind or the system will not initialize.
• The motor will emit a series of rising tones when the battery is connected,
and then 6 even tones indicating the number of cells connected.
• An LED will light on the receiver when it is initialized
7. Reinstall the battery hatch.
ESC Tones
If the ESC sounds a continuous double beep after the flight battery is connected,
recharge or replace the battery.
ESC Error Tones Tone Meaning Possible problem
Continuous slow single tones Abnormal throttle signal
Transmitter and receiver not bound
Throttle lead damaged or not plugged into receiver
Throttle lead plugged into receiver backward
Continuous rapid single tones Throttle signal not at low position
Throttle stick not at low position
Throttle travel reduced below 100%
Throttle reversed
Throttle trim raised
Continuous double tones Battery voltage is beyond acceptable range Verify battery is a 22.2V 6-cell LiPo
Verify battery is fully charged
10mm (±7mm)
ReferenceReference

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Viper 90mm EDF
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Transmitter and Receiver Binding / Enable or Disable SAFE Select (BNF Basic)
The BNF Basic version of this airplane includes SAFE Select technology, enabling you to choose the level of flight protection. SAFE mode includes angle limits and
automatic self leveling. AS3X mode provides the pilot with a direct response to the control sticks. SAFE Select is enabled or disabled during the bind process. With SAFE
Select disabled the aircraft is always in AS3X mode. With SAFE Select enabled the aircraft will be in SAFE Select mode all the time, or you can assign a switch to toggle
between SAFE Select and AS3X modes.
Thanks to SAFE Select technology, this aircraft can be configured for full-time SAFE mode, full-time AS3X mode, or mode selection can be assigned to a switch.
IMPORTANT: Before binding, read the transmitter setup section in this manual and complete the transmitter setup table to ensure your transmitter is properly
programmed for this aircraft.
IMPORTANT: Move the transmitter flight controls (rudder, elevators, and ailerons) and the throttle trim to neutral. Move the throttle to low before and during binding. This
process defines the failsafe settings.
You can use either the bind button on the receiver case OR a conventional bind plug to complete the binding and SAFE Select process.
SAFE can also be enabled via Forward Programming.
• The included receiver has been specifically programmed for operation of this
aircraft. Refer to the receiver manual for correct setup if the receiver is replaced.
• Keep away from large metal objects while binding.
• Do not point the transmitter’s antenna directly at the receiver while binding.
• The orange LED on the receiver will flash rapidly when the receiver enters bind
mode.
• Once bound, the receiver will retain its bind settings for that transmitter until
you re-bind.
• If the receiver loses transmitter communication, the failsafe will activate.
Failsafe moves the throttle channel to low throttle. Pitch and roll channels move
to actively stabilize the aircraft in a descending turn.
• If problems occur, refer to the troubleshooting guide or if needed, contact the
appropriate Horizon Product Support office.
To Enable SAFE Select To Enable SAFE Select
To Disable SAFE Select To Disable SAFE Select
Using The Bind Button... Using The Bind Plug...
SAFE SELECT ENABLED: The control surfaces cycle back and forth twice
with a slight pause at neutral position every time the receiver is powered on.
SAFE SELECT DISABLED: The control surfaces cycle back and forth once
every time the receiver is powered on.
SAFE SELECT DISABLED: The control surfaces cycle back and forth once
every time the receiver is powered on.
SAFE SELECT ENABLED: The control surfaces cycle back and forth twice with a
slight pause at neutral position every time the receiver is powered on.
Press and hold Bind Button
Press and hold Bind Button
Release Bind ButtonOrange Flashing LED
Connect PowerLower Throttle
Bind TX to RX
Bind TX to RX
Lower Throttle Connect Power
Release Bind Button
Orange Flashing LED
Install Bind Plug
Remove Bind Plug
Connect Power
Bind TX to RX
Lower Throttle
Install Bind Plug
Remove Bind Plug
Lower Throttle Connect Power
Bind TX to RXOrange Flashing LED
Orange Flashing LED
BIND
BIND
BIND
BIND
General Binding Tips and Failsafe

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After assembly and transmitter setup, confirm that the control surfaces are
centered. The model must be powered up and bound to the transmitter in AS3X
mode, with the throttle left at zero. When enabled, SAFE mode is active at power
up. AS3X mode is activated when the throttle is raised above 25% for the first time
after being powered on. It is normal for the control surfaces to respond to aircraft
movement if the aircraft is in AS3X or SAFE modes.
1. Verify the trims and subtrims on your transmitter are zero
2. Power up the model in AS3X mode and leave the throttle at zero
NOTICE: Be aware of the pushrod bottoming out in the ball linkage. Do not
thread the pushrod too far into the ball link or the pushrod will damage the ball
link and protrude into the area needed for the control ball.
3. Center the rudder with the bottom of the vertical stabilizer. If adjustment is
required, turn the ball link on the linkage to change the length between the
servo arm and the control horn until the rudder is straight.
4. Center the ailerons by aligning the outboard end of the aileron with the trailing
edge of the wing. Adjust the linkage length as in step 3 as necessary.
5. Center the elevators with the inside portion of the horizontal stabilizer trailing
edge. Adjust the linkage length as in step 3 as necessary.
6. Center the flaps by aligning the inboard end of the flaps with the wing fillet of
the fuselage. Adjust the linkage length as in step 3 as necessary.
SAFE®Select Switch Designation
SAFE®Select technology can be assigned to any open switch (2 or 3 position)
controlling a channel (5–9) on your transmitter. Once assigned to a switch, SAFE
select ON gives you the flexibility to choose SAFE technology or AS3X mode while
in flight. If the aircraft is bound with SAFE select OFF, the aircraft will be in AS3X
mode exclusively.
IMPORTANT: Before assigning your desired switch, ensure that the travel for that
channel is set at 100% in both directions and the aileron, elevator, rudder and
throttle are all on high rate with the travel at 100%.
CAUTION: Keep all body parts well clear of the rotor and keep the aircraft
securely restrained in case of accidental throttle activation.
TIP: SAFE Select is assignable on any unused channels 5–9. See your
transmitter manual for more information about assigning a switch to a channel.
TIP: Use your radio channel monitor to confirm that the four primary channels
are showing 100% travel while assigning the switch.
TIP: Use the channel monitor to make sure the switch you are assigning for SAFE
Select is active and driving a channel between 5-9 and that it is traveling 100% in
each direction.
TIP: Make sure your four primary channels are not reversed if you are having
trouble assigning a SAFE Select switch.
Assigning a switch
1. Bind the aircraft to choose
SAFE Select ON. This will
allow the system to be
assigned to a switch.
2. Hold both transmitter
sticks to the inside bottom
corners and toggle the
desired switch 5 times
(1 toggle = full up and down)
to assign that switch. The
control surfaces of the
aircraft will move, indicating
the switch has been selected.
Repeat the process to assign a different switch or to deactivate the current switch
if desired.
Mode 1 and 2 transmitters
X 5
100%
100%
Control Surface Centering
Rudder, Elevator, Flaps, and Aileron Center Positions

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Viper 90mm EDF
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Control Horn and Servo Arm Settings
Factory Setting Control Horns Servo Arms
Elevator
E
A
R
E
A
R
Rudder
E
A
R
E
A
R
Aileron
E
A
R
E
A
R
Flap
E
A
R
E
A
R
Nose Wheel Steering
E
A
R
E
A
R
Control Surface Direction
Switch on the transmitter and connect the battery. Use the transmitter to operate
the aileron, elevator, and rudder controls. View the aircraft from the rear when
checking the control directions.
Ailerons
1. Move the aileron stick to the left. The right aileron should move down and the
left aileron up, which will cause the aircraft to bank left.
2. Move the aileron stick to the right. The right aileron should move up and the
left aileron down, which will cause the aircraft to bank right.
Elevators
3. Pull the elevator stick back. The elevators should move up, which will cause
the aircraft to pitch up.
4. Push the elevator stick forward. The elevators should move down, which will
cause the aircraft to pitch down.
Rudder
5. Move the rudder stick to the left. The rudder and the nose wheel should move
to the left, which will cause the aircraft to yaw left.
6. Move the rudder stick to the right. The rudder and the nose wheel should
move to the right, which will cause the aircraft to yaw right.
Tuning Control Horns Servo Arms
More control throw
Less control throw
The table to the right shows the factory settings for the control horns and servo
arms. Fly the aircraft at factory settings before making changes.
NOTICE: If control throws are changed from the factory settings, the AR637TA
gain values may need to be adjusted. Refer to the Spektrum AR637TA manual
for adjustment of gain values.
After flying, you may choose to adjust the linkage positions for the desired control
response. See the table to the right.
Aileron Stick
Rudder Stick
Elevator Stick