We have the FEA on the new bell housing design.
Hopefully I can publish it shortly.

Only minor mods are required to put ALL the bell housings stresses
down in the blue.

This is the same high loads  we subjected the
stock plate and our combined adapter plate motor mount
system to a few years ago. The load represent what happens
when you power on stall an aircraft with a 50 pound prop rotating
at max RPM and the pitch angle changing at one radian per second.
Just about enough to bend a Lycoming engine prop flange
according to the Sky Ranch Engineering manual. This is
the worst thing you can do to a PSRU or a direct drive
aircraft engine.  BTW If you go over a bump with your Cadillac
500 cubic inch V8, direct drive powered air boat the crankshaft
will break. Same principle.

Here is the static test rig again and the old FEAs on the adapter plates.

Bob White crashed his airplane with this adapter plate and it did not bend
but the lower motor mount tube buckled and the blades of the prop where sheared
off by contact with the ground. Nothing like a crash to test one's
designs.

The new bell housing has lower stresses and deflections
than this plate. However Larry is adding a tiny bit of meat here
and there to put it all down in the blue. There will be little or no
weight increase.


Paul Lamar ...No rotor no motor.

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