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From: "Rumburg, William" <william.rumburg@cdicorp.com>
To: "'lancair.list@olsusa.com'" <lancair.list@olsusa.com>
Subject: RE: 320/360 Spinner Backup Plate Fractures
Date: Tue, 3 Oct 2000 10:53:33 -0400 
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          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
          <<  Lancair Builders' Mail List  >>
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>>

>  After cracking
>  two backup plates in short order on my 360 and then making the fix I have
> had no cracking in 400 hours.
> 
	The fiberglass spinner currently sold by Lancair for the 320 is
"light as a feather". It is subject to more substantial forces than you
might appreciate. Centrifugal forces at high rpms and the accompanying
aerodynamic pressure at high speed cause it to bulge outward, however,
there's no need for "doublers", "secondary bulkheads", etc., provided that
it's well-aligned. 
	I've run mine up to 3,000 RPM and it's shown no problems at all
after 100 hours of operation. Some time ago, I posted my technique for
proper alignment on the LML.
	Bill Rumburg
	N403WR  (Sonic bOOm)
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LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
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Please send your photos and drawings to marvkaye@olsusa.com.
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