REFLECTOR: Pitch Trim Mystery

[Alex Balic]

John-
In lieu of adding the weight- you might think about dropping the canard
incidence about a degree- will give you more speed too...

Alex

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of John Dibble
Sent: Thursday, February 16, 2006 12:09 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Pitch Trim Mystery

Steve,
I have one installed.  I need to check, but I believe it wroks against the
spring, so
I guess I need to reverse it.  How much work is involved to do that?

Scott B - I believe you mentioned that reversing the strainer could cause
instability.  How can I flight test for this?

In the meantime, I plan to add 20lb to the nose, so I won't have to use the
full trim
adjustment at cruise.

John

steve korney wrote:

> 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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