Paul

I'll send this for your review tomorrow...................

jeff

This is a beauty Jeff. These will add greatly to the professional look
of the Mazda powered airplanes. Thanks again for doing these. These will sell
for years.  Tracy should adopt them as stock with his gear box.


Paul Lamar
Hi Paul,
Nice looking MM plate. There appears to be very little metal remaining and
I was wondering if anyone has done  an FEA using the final dimensions and
appropriate g'box and prop loads (both as "dropped in" landing dead weight
 and cyclic prop weight combined with max turbulence load)? Also, considering
the amount of metal remaining would it be better to slightly increase the
width of the "spider" legs and take the pockets all the way through? I'm questioning
 the benefits  a 1/8" web wall adds to the structure.    Dave M.

You have a good point there but the stiffness is adequate for the job
and the strength has a 10 to 20 safety factor. The implications
of having it totally open are unknown. My guess is there may be a
dust or dirt issue. I don't know. One would have to build one and
test it for several years to see if there are any draw backs related
to the entirely open sections.

If one were concerned with the plate stiffness under aerobatic conditions
one could always add stiffing struts to the bell housing bolt circle area
as in this this dwg. This is a particularly light weight way of building a PSRU
with a very thin housing to save a lot of weight.

Paul Lamar


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