Sender: <marv@lancaironline.net>
To:  lml@lancaironline.net
Date: Wed, 08 Jul 2009 11:16:04 -0400
Message-ID: <redirect-3749275@logan.com>
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From: "Dan Schaefer" <dfs155@roadrunner.com>
Subject: Re:Shimmy and engine mounts
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On my early 235, inflating the nose wheel tire to over 28 psi will 
inevitably induce shimmy. No theories as to why and no guesses as to how 
this might relate to other Lancairs, just the way it is for my LNC-2. I wear 
the shoulders off the nose tire a bit faster than I like but I like shimmy 
less. The strut was installed way back in about '93 so it's certainly an 
early version - pre many updates - but it's pretty good and requires the 
mimimum of maintenance (a bit of nitrogen maybe every three years). Go 
figure.

Regarding the pics of the ES engine mount for a Cont. 550, those joins sure 
don't look all that beefy! During my current inspection, I gave my mounts 
(Dynafocal type) a very close look as a result of the ongoing thread and, 
though the mount only has to hold up a little O-235 (and react no more than 
125 HP) the weld joins on my mount are way more robust than the ones in the 
pics. The airplane has about 1000 hours on it now and I have yet to see an 
engine mount crack. Looks like the mounts in the pics (and all like them) 
could really use some judicious re-engineering, particularly at the weld 
joins.

Dan Schaefer
Early 235 -- N235SP 


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