The sides being tapered (draft) seem to be the biggest problem,
especially with the internal concave section at the top - who
insisted on this again !? I'm wondering if it's worth it.

G'Day George,
 I "suggested" the shoulder for the mount, based on experience with VW
buggy engine mounts, where the bolts carry the loads in shear. The
threaded holes crack radially and then the bolts pull the whole thread
out like a plug. If it is a problem, then delete it. At assembly stage,
install a plate like a large washer on the inside to spread the loads;
but I doubt it would be as effective as the cast in shoulder. Dave McC, Perth-- 

The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2003 All world wide rights reserved.