Contra-rotating motor - RC Groups
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Feb 11, 2012, 05:42 PM
Yea, I fly dusty planes..
zeezee's Avatar

Contra-rotating motor

I was scanning some RC sites this A.M. and saw a contra-rotating motor and am curious as to what the benefit of using one would be. I believe reduction of torque or elimination would be one, but what else. I know how twin blades work on a co-axial heli with two motors and inner and outer shafts. How do you get two shafts spinning in different directions? Some type of gearing? Dave
Last edited by zeezee; Feb 11, 2012 at 05:57 PM.
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Feb 12, 2012, 07:35 PM
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2 motors one wired for CW the other wired for CCW on the same ESC
Feb 12, 2012, 08:25 PM
Good Better Best quest.
olmod's Avatar
There is a good thread in power systems that should help.
Feb 12, 2012, 10:06 PM
Bypass Ratio = Infinity
scatsob's Avatar
No gearing, on shaft for the front bell and one shaft for the rear. In theory this setup eliminates prop wash and increases efficiency. I am building an ESM spitfire with the big version of what you have in the picture. There is also a thread in this forum where several people have made their own CR motors.

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