[rotary rocket]

It seems to me that if outrunners have a lot of torque you could use it to your advantage and get rid of the center diff. This would save weight and should result in a more efficient overall drive line.

Of course you would pick a much lower RPM motor and you wouldn't have much flexibility in changing your speed if you use it in place of the center diff.

CC, would you be able to make your motors such that the center shaft is sticking out of both ends?