From: ByronMFox@aol.com
Message-ID: <a9.bc3018d.27096b56@aol.com>
Date: Mon, 2 Oct 2000 00:38:46 EDT
Subject: Preventing Spinner Backup Plate Stress Fractures
To: lancair.list@olsusa.com
Reply-To: lancair.list@olsusa.com
Mime-Version: 1.0

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I'm about to replace my stress fractured 320 spinner backup plate which also 
had the rivets on three of the four doublers fail.  I've already received 
some great advice and I'm looking for more.

For example, Ross at the factory suggested that the doublers be well glued 
with Hysol to the backplate before riveting to more effectively distribute 
the loads on the bolt holes.  Brian Winterberg and his friend, Fred Baron, 
built in a baffle toward the nose of the spinner which fits over the hub and 
supports the forward walls of the spinner.  This prevents all 13.5 inches of 
the spinner's length being carried only by the backplate.  Finally, I read in 
the 3/97 issue of LNN that Robert Sternfels had a rubber disk mounted on the 
front of the hub which fits snugly into the nose of the spinner which 
accomplishes the same goal sought by Brian and Fred.

I would greatly appreciate any other solutions or variations on a theme that 
others have evolved to solve this not uncommon problem.
Thanks,

Byron Fox
LNC 2
N3144C
Mill Valley, CA
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