Assembly and Operating Manual
SPECIFICATION
Length 25.19 inch (640mm)
Wing Span 27.76 inch (705mm)
Flying Weight 11.64 oz (330g)
Assembly and Operating manual VIPER
Dear customer,
Congratulations on your choice of a factory
assembled model aircraft from Max-Thrust and
thank you for placing your trust in us.
Very little preparation work is required to get this
model ready to fly. To operate your new model
safely it is important that you read through all of
the instructions and safety information included
with your model, before you fly it for the first
time.
The illustrations in this manual show the model
with factory applied decals.
The Power System
The model is powered by a brushless outrunner
motor and ducted fan, both of which are pre-
installed.
The Radio Control System
To fly the Viper you will need a radio control
system with at least four channels. 2.4GHz
radios systems are recommended.
The servos for the ailerons and the elevators are
factory-installed.
The power for the receiver is drawn from the
electronic speed controller’s integral BEC
system.
The electronic speed controller is located inside
of the fuselage, in front of the ducted fan.
To check the model’s operating systems, first set
the control surface servos to neutral by setting
the trims to center and leaving throttle stick and
trim to the lowest position.
When you wish to fly the model, always make
sure the transmitter is “ON”. Move the throttle
stick to the “OFF” position as well. Then connect
the battery to the electronic speed controller.
Proceed to power down in reverse order:
disconnect the battery from the electronic speed
controller first, and then switch off the
transmitter.
Glue Joints With Suitable Adhesives
Foam safe epoxy is recommended and available
from most reputable model retail shops.
Trial-fit all parts “dry” before applying glue.
Follow the recommended curing time suggested
by the glue manufacturer. Allow the glue to fully
cure (harden) to the point where the joint can be
placed under stress.
Kit Contents
Fuselage, with motor, electronic speed controller
and servos
Clear canopy and cockpit
Left / right wing panels with ailerons
Left / right tail plane panels with elevators and
vertical stabilizer
Accessories
1 x 20A Brushless ESC (Electronic Speed
Controller)
Assembly and Operating manual VIPER
Fig. 1 Open the box and check all the parts.
Parts Illustration
Parts List
NO. Description
1 Fuselage
2 Nose Cone
3 Cockpit Canopy
4 Wing Set - One Wing Panel
5 Tail Set - One Horizontal Stabilizer
6 Tail Set - One Vertical Stabilizer
7 Push Rod Set x 4 (2 x long, 2 x short)
8 Servo fairing
9 Control horn and support plate x 4
10 Ventral fins
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Fig. 2 - Locate the short push rod set.
Fig. 5 - Glue the servo fairing.
Fig. 3a - Install the aileron control horn,
ensuring the screws are screwed through the
control surface into the support plate - Fig. 3b
Fig. 6 - Install the Servo fairing.
Fig. 4 - Connect the push rod to the aileron
servo arm and control horn.
Fig. 7 - Locate the fuselage and nose cone.
7
2
4
6
3b
5
3a
Fig.8 - The nose cone is held in place by
magnets and can be lifted off.
Fig. 11 – Thread the aileron servo lead up
through the fuselage and into the receiver bay
before gluing the wings in place.
Fig. 9 - Apply glue to the mounting area of the
main wing.
Fig. 12 - Apply glue to the underside of the
horizontal stabilizer.
Fig. 10 - Apply glue to the saddle.
Fig.13 - Apply glue to the tail end of the
fuselage of where the horizontal stabilizer sits.
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9
10
11
12
13
Fig. 14 - The photo shows the finished view
after gluing the horizontal stabilizers in place.
Fig. 17 - The photo shows the finished view
after gluing the vertical stabilizers in place.
Fig. 15 - Apply glue to the base of the Vertical
Stabilizer.
Fig. 18 - Install the elevator control horn,
ensuring the screws are screwed through the
control surface into the support plate.
Fig. 16 - Apply glue to the slot of where the
vertical stabilizer sits.
Fig. 19 - Connect the push rods to the elevator
servo arm and then to the elevator control horn
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15
16
18
19
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Fig. 20 - The photo shows the finished view.
Fig. 23 – Locate the Ventral Fins.
Cut apart for assembly as shown.
Fig. 21 - Connect the elevator push rods to
the arm of servo.
Fig. 24 - Ventral fins shown after being
separated
Fig. 22 - Connect the electronic speed
controller and servos to the receiver.
Refer to your radio instructions for the
correct channel assignments and polarities. .
Fig. 25 - Glue them into the slots (glue not
included).
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22
21
24
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Fig. 26 - Photo shows Ventral fins in attached position
Fig. 28 - Place the fully charged flight battery in the fuselage and
connect it to the electronic speed controller (Be sure the transmitter is
“ON” first). The canopy is held in place by magnets and can be lifted off.
Fig. 27 - Locate the battery and canopy. Charge the battery according
to the safety instructions before installing.
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Fig. 29 and 30 - Checking Ailerons and Elevators
- Check that the control surfaces respond to the appropriate
movements of the transmitter joysticks. If not, swap over the
servo leads at the receiver.
- Check the neutral position of the control surfaces; you may
need to screw the clevises in or out to correct any
discrepancy.
- Stand behind the model.
- Check the direction of rotation of the servos:
- Move the aileron stick to the right (a), and the right aileron
(a) must rise up, the left aileron (b) fall down.
- Pull the elevator stick back towards you (c)，and the trailing
edge of both elevators should rise (c).
- If either function works in the wrong way, correct it using
your transmitter’s servo reverse switch for that channel.
Fig. 31 - Checking the power system
- Hold the model securely.
- Remove any loose objects such as cloths, tools, etc from
the area in front of the model, as they could easily be
sucked into the ducted fan.
- Open the throttle (stick forward): the motor should now run
and you should feel a strong air flow rushing out from the tail
end of the model.
- Move the throttle stick back to the “OFF” position.
- Disconnect the battery from the electronic speed controller
and then switch the transmitter off
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29
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Fig. 32 - Checking the model’s Balance
- Place the battery in its compartment without connecting.
- Mark the Centre of Gravity (CG) on both sides of the fuselage; the position
is shown in the photo.
- Support the model at the marked points and allow it to hang freely. When
correctly balanced the airplane will remain horizontal with the nose slightly
down.
- If necessary, adjust the position of the flight battery to achieve the correct
CG.
- Mark the battery location in the fuselage, so that you can be sure of
positioning it correctly after recharging.
- Pack scrap pieces of foam around the battery in its final position, otherwise
there is a danger of it shifting in flight and altering the model’s balance.
- Charge the flight battery and the model is ready for flight.
Fig. 33 - Access to the ducted fan unit and electronic speed controller
- The ducted fan unit is accessible from underneath, if you need to carry out
maintenance work or repairs.
- Ensure that the wire colors match correctly.
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Fig. 34 - Congratulations, you have completed the assembly process. We
hope you enjoy flying your new model
Test Flying - Notes on flying the airplane
- For the first flight you should wait for a relatively calm day with no more
than a gentle breeze.
- A good flying site is a large, flat, open field; well away from trees, fences,
high-tension overhead cables and other potentially dangerous obstacles.
- Carry out a complete check of the working systems.
- We recommend that you ask an experienced modeler to help you initially;
to give the model a fairly powerful hand-launch.
- The model must be launched directly into any existing wind.
- Switch the motor on, and launch the airplane strongly into the wind, with
the fuselage and wings leveled.
- Allow the Viper to fly straight and level initially; don’t try to turn it when it is
close to the ground.
Adjust the trims if necessary so that the model settles into a steady climb.
- Check the model’s response to control commands from the transmitter.
- You may need to increase or reduce the control surface travels once the
model is back on the ground.
- Take the airplane up to a safe height and check its stalling speed.
- Keep the speed well up on the landing approach to avoid stalling.
- If you had to move the trims during the flight, correct the mechanical
linkages before flying again. This allows you to re-centre the trims, so that
full trim travel is available for subsequent flights.
- We reserve the right to introduce technical modifications and suggest that
you check our website for updates.
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