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Date: Fri, 17 Jun 2005 11:26:43 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: PSRU adapter plate
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My bellhousing is to heavy. Dave McC is considering buying it for his 
Europa, so I've been researching what it would take to replace it.  I 
think Tracy' s adapter plate is a very elegant solution for the 
homebuilder (ie, those of use without a foundry).

His adapter plate uses 1/2" 6061.  I've been considering at 7075 
aluminum.  It has about twice the cost but also twice the yield 
strength.  If I could use 1/4" plate instead of the 1/2", the cost would 
be comparable, but I would have the very large benefit of saving 
something on the order of 4lbs in a very weight sensitive area.  I don't 
have the expertise to run the numbers with confidence.  All I can do is 
a static analysis following the directions outlined on PL's website, 
just like I did for the engine mount.

Any advise of stuff to look for that might no be so obvious and not show 
up in a static analysis? (the three axis and torsional forces are obvious)

Ernest (hoping I didn't coin any more new words)

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