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Acer SpeedWing MiniTwin 250 Assembly Instructions Manual page 10

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Optional Rudder Operation (differential thrust)
You can have rudder control by mixing the signal to two ESC's either by using your
Computer radio mixes, or by using an onboard V-Tail mixer. This gives you differential
thrust in both motors that you can control with your rudder stick and acts much like a
normal rudder. It also can make your wing do EXTREMELY fast flat spins. Here are
the two ways you can make the rudder work. Important: You will have to take out the
positive (
) lead on one of the ESC's where it plugs into the receiver. This is so that
red
you don't put too much power into the receiver. Either tape the contact or apply some
heath shrink to insulate it from touching other components.
Computer Mixing: For computer mixing you have to go into the programming
mode on your computer and use Premix 1 and Premix 2. Here's how they are set.
Mixes
Master
Slave
Settings
Premix 1
Premix 2
Channel 3
Channel 4
Channel 4
Channel 3
+100 U, +100 D
-100 L, -100 R
V-Tail Mixing: If you don't
have a computer radio, you
can use a simple V-Tail mixer
to create differential thrust.
The GWS V-Tail mixer
available on our website
works well with this setup.
Simply plug your RIGHT
speed control into the TOP
plug of the mixer and your
LEFT speed control into the
BOTTOM plug of the mixer.
Now plug the lead marked
AILERON into Channel 4 in
your receiver and the lead
marked ELEVATOR into
Channel 3 in your receiver.
You now have differential
thrust.
Before going to the next step, temporarily insert the motors into the motor
mounts and plug the motors into the speed controls. Now plug in your battery
and make sure the differential thrust is working.
10

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