One advantage is you could build a twin driving the same worm drive
   gear. Here is a 3D sketch using two AIXRO kart Wankels.

   This is by far the lightest helicopter gear box configuration.

   20:1 400 RPM rotor.

   Paul Lamar

I think you would need a way of disengaging the worm gear in the event of one engine
failing or quitting. Worm gears work good on the drive but not as driven.

Dale Davies


   centrifugal clutch.
   standard on kart engines.

   Paul Lamar


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