§ Before You Fly
50
Viper Jet MKII Composite
B
B
e
e
f
f
o
o
r
r
e
e
Y
Y
o
o
u
u
F
F
l
l
y
y
Set Up Center of Gravity and Verify
Control Throws and Directions
Required Parts
o
o
o
o
Completed Airplane
o
o
o
o
Hook & Loop Fastener for Battery [F5]
o
o
o
o
Battery
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As shown in the diagram on page 42 the center
of gravity of the Viper Jet is 78mm – 85mm
behind the leading edge of the wing where it
meets the fuselage. Make sure your center of
gravity is close to this location for the maiden
flight; you may move it later to suit your flying
preference.
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Mount the battery to the bottom of the fuselage
using the supplied hook and loop fastener. Move
it forwards or backwards until you achieve the
desired center of gravity.
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Double check the control throws and the
direction of travel for all you control surfaces
(including nose wheel steering). Use this
opportunity to reverse any channels operating in
the wrong direction.
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If your nose wheel steers opposite from your
rudder you will need to cross the pull-pull
steering wires (in case of retracts). Alternate
solutions are to use two channels and a custom
program mix on your radio, a reversing Y-
Harness or a servo matching box.
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As a reminder, the control throws are as follows:
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Aileron Control Throw: 8mm each way.
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Elevator Control Throw: 10mm each way.
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Rudder Control Throw: 16mm each way.
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Flap Control Throw: Take-off is 20mm and
Landing is 30mm.
Check Power System
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Before flying any electrical plane it is good to
test the operation of your power system to
ensure you don’t exceed the capacity of any of
the installed components.
Connect a meter in-line with your power system
and measure the amps and the watts to verify
they are within the specifications of your
battery, ESC and motor.
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The minimum recommended battery for the
SAPAC Viper Jet Composite is a 4S 3300mAh
25C LiPo Battery. You can get extended flight
times and better performance by using higher
capacity and/or higher C rated batteries. Test
multiple configurations to find which battery
setup is best for your desired flight profile.