REFLECTOR: Pitch Trim Mystery

[steve korney]

A lite spring and a external trim tab would solve that problem.....  Like a 
sparrow strainer

Best... Steve



----Original Message Follows----
From: John Dibble <aminetech at bluefrog.com>
Reply-To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Subject: Re: REFLECTOR: Pitch Trim Mystery
Date: Wed, 15 Feb 2006 11:28:10 -0600

Well, that sounds like a good guess.  For the entire flight either the 
autopilot or
myself was adding a little extra pressure to maintain level flight.  After I 
got out
of the plane I pushed down on the elevator a little.  Maybe that is what 
made it work
again.  I'll check it out.  But wouldn't pulling back on the stick also do 
the same
thing?  Or am I not understanding this right?

Scott - It took a lot of force and of course the farther I pulled back, the 
stronger
the force.  It felt like I might break something.  I suppose you could trim 
your
elevator all the way up and feel the force to pull the stick back to 
neutral.

John

Alex Balic wrote:

 > The pitch trim jack screw has an internal "switch" that turns it off in 
the
 > particular direction of travel that would bottom it out- possibly this is
 > just slightly out or the contact is burned, hard to tell- not sure if you
 > could even open it up to check that - you might want to do some
 > experimenting- see if you run it all of the way to the bottom and you 
force
 > it if it might move just a bit more and loose contact internally, after
 > relieving pressure, apply pressure in the opposite direction-  might move
 > back just a tiny bit to regain contact again- just a guess......
 >
 > -----Original Message-----
 > From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
 > Behalf Of John Dibble
 > Sent: Wednesday, February 15, 2006 10:46 AM
 > To: Velocity Aircraft Owners and Builders list
 > Subject: REFLECTOR: Pitch Trim Mystery
 >
 > Seems like when the Reflector has a what-if discussion, soon after 
someone
 > has to go
 > out and experience it.  I guess the pitch trim failure had my name on it.
 > Last night
 > I flew 1.7 hrs at 180 kn with the pitch trim pegged at down trim.  I cut
 > power just
 > enough to descend at 500 fpm and kept the trim pegged.  At 5 miles out I
 > slowed to get
 > set up for landing and noticed the pitch up trim wasn't working.
 > Fortunately I've
 > flown at night enough, so that that didn't add much to the problem.  I 
had a
 > 5000 ft
 > runway and a direct 10kn headwind which was a good thing.  Didn't know 
how
 > long my arm
 > would hold out so I took the fastest way in and kept my speed up to 90kn.
 > Wasn't sure
 > if I could hold it off at 70.  The landing was a little rough, but I've 
done
 > worse.
 > Today I checked it out and the trim is working fine.  Can anyone tell me
 > what
 > happened?  I have fuses and no CBs so it wasn't that.
 >
 > John
 >
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