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Differential Thrust on a Trimotor. Anyone make it work?

#1
I'm starting a scratch build of a Sikorsky S-35, a trimotor built to be the first to cross the Atlantic. It crashed on takeoff and that was the end of it.

So has anyone worked out differential thrust on 3 brushless motors? I'll be using a DX8e. It uses 3 vertical stabilizers and the build would be simplified if they were just stationary.

s35.jpg
 

quorneng

Well-known member
#5
I could say leave the rudders fixed and simply turn using the ailerons but add differential.
It then doesn't matter how many motors you have as long as the thrust is balanced.
Works for me! ;)
 

tamuct01

Active member
#6
To do differential thrust on the two outboard motors you need a transmitter with at least 3 mixer slots. At least 1 to couple the throttle channel to the 2nd (or 3rd motor) and 2 more to couple rudder input to each of the outboard motors. In your case with the tri-motor, you will need 4 mixes. A standard twin needs 3 mixes.