REFLECTOR: Pitch Trim Alternatives

[Al Gietzen]

Joe;

 

Looks like a workable concept.  Lot's of parameters to work out - one thing
is I'd think the lengths of the arms on servo and torque tube should be
similar to provide linear response over the range, and the range of travel
may need to be 3" or more.

 

I also wouldn't think the power off disengage is needed.  TruTrak servo I
have doesn't - and it should.  Too much drag.

 

Al

 

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Joe Ewen
Sent: Sunday, May 13, 2007 1:13 PM
To: Velocity Aircraft Owners and Builders list
Subject: REFLECTOR: Pitch Trim Alternatives

 

I am looking into alternatives to the stock factory pitch trim.  Due to
installed instrumentation, I do not have room for the factory stock pitch
trim spring.  I was considering the Strong Pitch Trim, but due to 1 negative
report and the fact that I have electronics installed in the keel that would
interfere, I have been looking for alternatives.  One idea I am considering
is using a spring linkage driven by a servo motor.  The servo would be
autopilot grade (mechanics disengaged when power is off) and the linkage
would have enough spring travel to facilitate full elevator travel in the
event the servo was stuck in either extreme.

 

I am looking for comments and suggestions on the attached pdf as well as any
other alternatives.

 

Thanks,

Joe

 

 

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