> 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.

Hi Paul,

Glad to help. :)  There is some slight bending of the plate near the
motor mount attach points (pilot side only I think)  It's all outside
where the plate provides the PSRU back plate function.  Saturday I will
take a picture with a straight edge next to the plate.

Bob W.