Mailing List flyrotary@lancaironline.net Message #30234
From: Tracy Crook <lors01@msn.com>
Subject: Re: [FlyRotary] Engine mount plate thickness
Date: Wed, 15 Feb 2006 08:55:49 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
There are never any absolutes. 
 
The answer depends on configuration of the mount.  In my -4 mount, the bending load on the plate is distributed across the entire length of the engine and the moment arm is almost zero on one side and less than one inch on the other.  This is so under-stressed that I actually went down to 3/16 6061 T6 when changing engines to Renesis.  If your mount is similar to the CC mount (rubber isolators on the plate itself) and forces are concentrated at the 4 corners and moment arm is longer,  then the plate needs to be thicker.  My CC mount on the -8 uses 1/2" 6061 T6 and is probably more than strong enough.
 
EVERY part needs to be looked at IN CONTEXT, not generalized.
 
Tracy  (No absolutes, even when it comes to airfilters : )
 
----- Original Message -----
From: Scott

Hello All...

Well I've given up on another attempt at an engine
mount( fabricating an alternate alternator mount pad
which lined up extactly and allowed the right belt
tension did this one in ) and am throwing in the towel
to go with the sandwhich plate approach. 

I was hoping someone might have already had the holes
plotted in a tool which I could just print out and
tape to my plate and start drilling.

Additionally, in Tracy's rotary conversion guide he
suggests a 1/4" 2024 plate, is this still the
prevailing wisdom?

Thx...
-Scott



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