Mailing List flyrotary@lancaironline.net Message #15945
From: Ed Anderson <eanderson@carolina.rr.com>
Subject: Re: [FlyRotary] Re: Flex plate <> Flywheel [FlyRotary] Re: flex plate
Date: Mon, 24 Jan 2005 18:24:45 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>

>
I've read this several times, and still not quite sure I can believe
it.  The flex plate I have is thin.  In the .040" range thin.  I realize
that it will all be shear forces, but can 9 threaded holes be expected
to take the 800ft/lb of reaction forces that a typical NA engine is
expected to put out?
(I believe I got the 800ft/lb number out of the discussion of the
Schwertz beam motor mount on PL website).  Just doesn't seem like it
could hold up.

For crimmney sakes, Ernest - not so loud.  If we never tell it, it won't
know it can't handle it.

Ernest, I think the flex plate is more like .092 - 0.125 " thick or more.
In any case, I have never heard of a flex plate failing.
It will would also take a bit less stress without the gear shifting going on
as in the automobile.  Also, not certain but I think the flywheel torque is
on the order of 150-200 ft/lb for an NA engine.

Ed A


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