But imagine a twin engine (contra rotating) using 20B's....

 > Mmmmm....   Pond Racer.....
 >
 > Martin Morgan
 > Pitts S-1S

 If you use a belt or chain drive you can turn one engine around as in
 this drawing. Forget running one backwards. The cooling would be all wrong.

 Paul Lamar

You could also use the Marcotte or Powersport internal spur drive for the
other engine.  Maybe not as many hours as Tracys, but I would still trust the
Powersport PSRU over a belt or chain drive any day.

Dave Leonard

900 HP Dave? BTW Dave, are you still in Japan. If you are near Tokyo
I might have a pleasant surprise for you. 

Also are you getting your subscription to EAA Sport Aviation mag over
there?
 
Paul Lamar
 
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