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Message-ID: <01FC42FED6D5D011BF3D00805FBE51AAB833AE@esekint101>
From: "Sven Jerlhagen (QCS)" <Sven.Jerlhagen@ecs.ericsson.se>
To: "'lancair.list@olsusa.com'" <lancair.list@olsusa.com>
Subject: Geared trim system
Date: Wed, 13 Jan 1999 15:29:43 +0100
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          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
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>>
Though I'm sure Dick Reichels geared trim system is very nice, for those
that are more do-it-yourself inclined, I have a suggestion. I have a geared
manual trim system in my Lancair 320, which has been working very well now
for 100 hours. It involves an AN4 bolt completely through the center
console. On this, a lathed axle with a flange, to which a 6 inch plywood
wheel is riveted. A small gear is pressed onto the axle. A linear gear rod
attached to the trim pushrod rides on the gear. A milled piece holds the
gear and the gear rod together. All parts made from brass. There is a
fibreglass friction washer and a couple of dish spring washers, and the AN4
nut is simply tightened for the desired friction. The small gear is sized so
one full turn gives 150% of the original trim travel, which is perfect. A
small gear and a few inches of gear rod costs a couple of dollars, and a
couple of hours with your mill and lathe is all that is required.

Sven J
SE-XOP