Herb Sanders wrote:

Tracy, I am also apprehensive about the spacer mount engine to psru. A bellhousing
would subject the bolts to shear and tension loads. Your 3" spacers with small
sholder area put a bending load on the bolts and spacers repeated thousands of
times per minute from power pulses and from asymetrical thrust from the propeller
anytime the prop is not 90 degrees to line of flight (P factor from climbs,
decent, aerobatics, etc). Even the slightest movement could deform the sholder on
the alum spacer and deterioration would accelerate to possible failure. I don't
have a mechanical engineering education, so the view is have is intuitive - I
would appreciate a more educated opinion from those more able to give one.

Regards, Herb Sanders

Tracy's "spacer" are really half inch thick retangular aluminum
plates that encompass more than one bell housing bolt. As such
they provide shear material for the torque loads.

You can just make out these "spacers" on the right side of
this bad picture.
 
Paul Lamar
 
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