<Snip>

Yes that is true. What matters is how the prop torque gets to the mount.
Does it go through the spacers or not? If the mounts are on the motor
plate it does not go through the spacer and they are only subject to

engine

torque. Conversely if the mounts are on the engine the much higher prop
torque goes through the spacers.

Seems to me that the engine/PSRU should connect to the motor mount as

close

to the assembly's CG as possible.  Probably somewhere near the rear

rotor

housing.

OK, I got it now.  We're talking the bolts & spacers connecting the engine
to the mounting plate, *not* the bolts and spacers connecting the
engine/PRSU assembly to the engine mount proper.  Shoulda followed the
2-posting rule.

True Tom and this is a compromise. A bell housing casting would move the

mounts back

towards the engine/prop/PSRU/etc. CG several inches. The rear (front in a

pusher)

mount takes up the slack however which amounts to only about 50 pounds or

so.

Here is my preliminary cast bell housing design.

Casting eh?  Need a pattern?  This one should be a piece of cake compared to
a manifold.  Cheaper to pour too, since there wouldn't be any cores ;-)

Tom Kendall

Yes I do need a pattern. I need to do some more work on the design
to reduce the weight. I will take advantage of the .14 wall my foundry
can do out here. I'll send it to you in a few days after I get the manifold 
in the works.

Paul Lamar
 
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