Hi Paul,
I was looking at your engine mount. Is there only the two attached to your adapter plate or doe you have one higher that I can't see from the photos.
Regards Don

There are only two rubber bushings on either side of the engine
near the CG of the combination of PSRU/Engine/prop. Not as close to 
the CG as I would like but it is a compromise based on Tracy's
redrive design. I would like to have a bell housing incorporating
these mounts moved aft about two or three inches. 

There is a third rear mount but it does not have a lot of load on it.
It consist of a strut with rod ends on either end attached to the fire 
wall at the top and currently to an ear on the Mazda front cover. 
I will lengthen and attach it to the straddle mount on the new oil pan.
This design idea is used on the Questair Venture designed by Jim Griswald.

IMHO it is the lightest and simplest of aircraft engine motor mounts.
It is also very low vibration according to people that own Questair Ventures.
 
Paul Lamar
 
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