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

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