lml@lancaironline.net Mailing List Archive

Christian,

The aggressiveness of the elevator trim can be reduced by lowering the voltage to the circuit in cruise. I'm using 5V for low rate. In the pattern I use the full 14V. I actually increased the trim tab span slightly which improves the low speed trimable range. -don't know if re-extending the trim tab back to normal length is an option for you.

http://www.n91cz.com/VideoClips/TrimTabDualRate_0001.wmv

I installed this dual rate feature 12 years ago after discoverying how sensitive full rate trim was at high speed.

Chris Zavatson

N91CZ

360std

www.N91CZ.com

From: Christian Meier <lancair@meier.cc>
To: lml@lancaironline.net
Sent: Thu, March 4, 2010 11:31:44 AM
Subject: [LML] Re: Reichel Trim Wheel

On my 360 big tail I made my trim tab 1/3 smaller as the plans told me. The reason for that change was following:
I was told the elev trim is too aggressive in higher speeds but now the donwnside is that in lower speed (below 110kts)
the trim is not powerful enough to keep the plane trimmed in landing descent. At 90kts and full trim I need to pull the stick with 0,5kg.
Actually I have no spring installed. I thought about if the Lancair springtrim would help, but I'm not sure if 2 systems would be a good idea?
A second solution would be to extend the surface of the trimtab. But left and right elevator would be not symmetric anymore. Would the bigger
elevator on one side change the flight characteristics? I would need a 5/8" extension on full length of the trimtab...
Thank you for your comments.

Christian
www.lancair.at

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