From: Charles Brown
<browncc1@verizon.net>
To: lml@lancaironline.net
Sent: Tuesday, April 3, 2012 9:21
AM
Subject: [LML] Re: engine
movement
Paul, great shot, thanks. My engine, at 110
hr total time, is now (at rest) flush with the cowl; it started out 1/4" high
so has sagged 1/4 inch in 6mo/110 hours. Also, it's now Bug Season in
Texas and I have observed bugs on the upper cowl behind the spinner to a depth
of about 3/8" (and none on the lower cowl). So I conclude that flight
loads pull my spinner down about 3/8". The mounts are standard-issue,
whatever that is (I got the firewall forward fast build) -- look like basic
big ol Lord mounts. But I'm going to shim them and try to de-sag
things.
On Apr 2, 2012, at 1:59 PM, Paul Miller wrote:
This
photo demonstrates how much the engine pulls down (and also to the left)
relative to the cowl during normal operation in the Legacy. This was
from a photo shoot at normal power. At rest, the spinner is flush with
the cowl so I estimate at least an inch drop. This corresponds to what
I'm finding with interference on the lower cowl but it is at least an inch
away when I remove the cowl for inspection. My plan is to shim up the
mount at the front two isolators. These are relatively new Berry mounts,
no shims installed. All of the hard hits I previously had on the upper cowl
are now removed. I use a white primer between flights inside the upper
cowl to provide witness marks and the most recent flights have shown no
interference. However, I still get interference during flight at cruise
RPMs that I am starting to identify on the lower cowl. Hopefully, those
are the last. Tight cowling + twisting engines = lot of
work.
Paul
Legacy RG Spruce
Creek
<_BJV1340c.jpeg><spinnder_drop.jpeg>--
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