REFLECTOR: Pitch Trim Mystery
Alex Balic
alex157 at pwhome.com
Thu Feb 16 12:33:55 CST 2006
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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