Peter Cowan/Lexi Cameron wrote:

Do you have a current drawing of Marcotte's "300" (hp) drive?  The attached tif file is a fax he just sent me. What do you think of the design?

Marcotte also gave me the number for Bud Clark in Montana who has the "200" drive on a turbo charged 2.5 l Subaru with about 60 hours. Bud is very pleased with workmanship, noise and vibration levels. He has experience reworking his Ross drive as well.

Peter.

My impression is it is well engineered for an internal spur gear drive.
It is also true that internal spur gear drives are heavier than a 
planetary drive of the same torque capacity and cost more. 
They also have an undesirable thrust line offset for most aircraft
installations. They lower the engine relative to the thrust line taking 
up valuable room needed for a cooling radiator. I don't see the advantage.
Why bother?

Paul Lamar
 
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