I found this very informative......take it for what it's worth. Adobe doc.
Marc

http://www.autopsrus.com/

A stock Chevy V8 is unlikely to put out a constant 400 HP for more than five or ten minutes.
There have been dozens of attempts to use Chevy V8's in aircraft over the years.
All have failed.  Including the Thunder/Orenda.

BW probably stands for Bud Warren. Bud and his daughter died in a Chev powered airplane.

105 pounds or even 70 pounds  is ludicrous for an aircraft engine reduction gear.
Typical for a spur gear transmission.

A planetary is six times stronger for the same gear width and much much lighter.
The Ross weighs 35 pounds.

The off set is incorrect for a rotary. Makes the thrust line too low reducing
the prop clearance.

The offset causes a gear mesh problem when the aluminum gear box warms
up and expands.

Paul Lamar

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