Larry Dighera writes:

A motor in the hub design is the most elegant solution. I wouldn't
have thought the motor would have sufficient torque to drive the
wheels without adequate gear reduction.

Exactly - the much higher than usual (5x) low-speed torque of the
Chorus motors are what make them so appropriate for this application.
I wish I had a kit for my Aztec!

I got interested in BOREF for their licensing of Cool Chips
http://www.coolchips.gi/
to keep avionics and turbine engines(!) cool. I think that's going
to take awhile to develop. The motors are much more immediately
exciting.

--kyler