Originally Posted by
Malcolm H
Hey Jim,
"Motor torque is lower so reaction torque on the airframe is lower"
You'll have to explain this one to me, surely its the gearing output torque that's reacted into the fuselage not the motor torque? Therefore for a given propeller torque the reaction torque is the same regardless of the type of drive.
Malcolm
Hi Malcolm,
I've been waiting to see if there was some smart guy out there that would catch me on that one. In the single prop drives being discussed here the "gear box" is mechanically coupled to the motor/airframe and you are correct. What I said applies to the Contra drive where one propeller torque reacts against the other propeller and the "gear box" output is not coupled to the airframe. But you already knew that.
If I hadn't made the statement though, and you hadn't replied, we wouldn't have been able to highlight one of the features of the Contra. By the way at our recent District championships, all pilots flew electric and about 30% had counter rotating props .
Jim