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I saw on E bay that Aeromomentum is selling their gear boxes for 2300 ish dollars.  I e mailed them and they said they can build a box with a 3.1 to 1 ratio but it has about six weeks wait on the gears.  Is there a big reason that a Planetary system is better?? just thinking it would be much faster to go this route...They claim HP up to 225.  I was only shooting for 200..

Kay Caldwell

The big drawback is weight and thrust line off set on a rotary.

Spur gears are one sixth as strong as planetary with the same gear width.
That is why all aircraft engines use planetaries.

Also it is a good idea to add a rubber coupling.

It is worth a try but keep checking it and test extensively  where you can safely dead stick.

Paul Lamar

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