X-Mozilla-Keys:                                                                                 
Bill Freeman wrote:

                         BIG SNIP

Another factor here Bill is Perry's prop is much smaller in diameter
than your average prop and the polar moment of inertia is much less
as it is now very thin on the tips and made mostly from carbon fiber.

The e-shaft is almost stright through with a lot of solid meat in the
center due to the huge three inch diameter eccentric bearings.
Also it is quite short at around 9 to 10 inches center of front main
to center of rear main.
Compared to just about any crank it is bullet proof. If there are any
problems I suspect it is back by the flywheel end.

Paul Lamar

I agree that the stiff e-shaft and small diam and light prop are definite
pluses.  However, the high RPM and long prop extension are definite
minuses.   Overall, any auto engine should not be reasonably expected
to carry any loads other than a nearly pure output torque, as in it's designed
application.  There are, and will be, exceptions - but they are just that
*exceptions*.   As soon as you go outside the original design box, you
are now officially a test pilot,  wheeeeee!

Take care, and I really DO hope that the problem is not real, and that
the Mazda CAN take these loads for a long time, but I doubt it.  This is
one of the two main jobs of the PSRU, perhaps to be more accurately
called a PSR&TU  (prop speed reduction & thrust unit) ?

Bill

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