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Date: Mon, 17 Jan 2011 09:57:08 -0500
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From: "Douglas Brunner" <douglasbrunner@earthlink.net>
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Subject: RE: [LML] elevator trim speed (TruTrak)
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Paul,

This is a problem experienced by other Legacy pilots.

I am also a 28V plane, but don't think the problem is due to the voltage.
My trim speed is good for takeoff and landing, but way too fast for cruise.
I have adapted to it by learning to "blip" the trim in flight.

Ideally, trim would be two speed, or even continuously adjustable based on
airspeed.  There is a product that I considered installing that dealt with
this issue.  

http://www.tcwtech.com/Safety-Trim-Page.htm

My understanding is that it works off an airspeed switch that you can set to
a particular speed such as 160 knot - above that speed the trim works more
slowly - below that speed more quickly.

Other people have put in simple switches that are not tied to airspeed.  Of
course that could lead to one forgetting to reset for landing.

Doug Brunner

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of paul
miller
Sent: Saturday, January 15, 2011 10:11 AM
To: lml@lancaironline.net
Subject: [LML] elevator trim speed (TruTrak)

On my Legacy I have the 2004 Trutrak autotrim system with a DFC250 28v and
all works well.  The trim speed is very fast such that a bump of the switch
sets up a big pitch change.  I measure the full up to full down travel time
which is adjustable on the module from 5-8 seconds only--very fast.  My
certified aircraft run 30-40 seconds.  I wrote Trutrak and they said the
unit has to come back because it says 24v but may be wired for only 12v.   I
measured the voltage to the unit and it is fed 28v.  If you have one and
have similar trim speeds you might want to think about a fix because there
is nothing in the wiring diagrams that would suggest an error in
installation.  The diagram inputs show 12-24v to the unit.  I'd be
interested in travel times for other Legacy trims for comparison.

Paul
L2K-186  
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