RCU Forums - View Single Post - Twin motor aircraft and Counter rotating props
Old 03-30-2008 | 06:09 PM
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The_Mongrel
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From: Somewhere near here!, AUSTRALIA
Default RE: Twin motor aircraft and Counter rotating props


ORIGINAL: Tall Paul

Swift, you really oughta look AT the hardware you talk so much about but obviously have never used.
A pusher prop mounted on a tractor motor which is rotating CW when viewed from the front is no different than a normal prop on a tractor motor rotating CCW, viewed from the front.
Also, the problem the OP has isn't "torque", it's lack of steering authority in the water.
That needs either a water rudder.. simplest.. or differential steering with the motors.
Changing to a pusher prop and reversing the motor rotation won't have any effect on the water steering problem.
With glow motors the direction of rotation can't be changed, so pusher props are needed in pusher installations.
You are quit right. I did some more experimenting on the weekend. I have NO problem in flight. She does require a bit of trim to the right to keep her straight, but I have a feeling it is caused by a misaligned vertical stabaliser. I glued a piece of Depron onto the rudder that extends down and makes contact with the water when I apply some power. It is probably not long enough, but it did solve my problem.

I would love to setup differential steering using the motors, but I am not sure if my DX7 will support it... need to do a bit more research.

Thanks for the input.
-J