REFLECTOR: WEIRD STICK PROBLEMS

[Scott Baker]

I agree with others who are concerned about any uncommanded stick movement. 
If the stick is moving during taxi, look carefully inside the keel to see 
that nothing is interfering.  Look to see if the nose gear hydraulic lines 
are rubbing against the stick mechanism - or as one person suggested, if the 
aileron trim is doing something strange.  Is the stick pressure the same 
when moving the stick to the left and right? or is there some resistance 
moving the stick to the left?  When the aileron cables are disconnected at 
the wing root bellcrank, do the ailerons hang in the same relative position? 
With the aileron cables disconnected, move the ailerons up and down by hand 
... any rubbing or resistance inside the wing?  Any binding of the ailerons 
along the hinge or cut lines?  Temperature changes can open and close gaps - 
make sure cut lines offer sufficient clearances.  The more I think about 
this the more I think a flex hydraulic line is rubbing against the bottom of 
the stick.  Keep looking.
SB

----- Original Message ----- 
From: "Tom Martino" <tmartino at troubleshooter.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Monday, May 09, 2005 11:27 PM
Subject: RE: REFLECTOR: WEIRD STICK PROBLEMS


Would that cause the stick to sharply fall to the right?  Even when
taxiing?

I will certainly check it!  All suggestions are appreciated.

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Scott Baker
Sent: Monday, May 09, 2005 9:06 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: WEIRD STICK PROBLEMS

Q:  At a medium cruise speed ... say 175K indicated ... level the wings
using ailerons only to achieve straight flight ... Where is the ball?
Sounds like you might need the left rudder shimmed out - or - the right
rudder relieved so that it comes inboard - or perhaps a combination of
both
... not a lot ... try about 1/8th of travel at first ... see what
happens.
SB

----- Original Message ----- 
From: "Tom Martino" <tmartino at troubleshooter.com>
To: <reflector at www.tvbf.org>
Sent: Monday, May 09, 2005 7:37 PM
Subject: REFLECTOR: WEIRD STICK PROBLEMS


I thought my plane was rigged wrong ... or that I had a heavy wing ...
but NOT so.



Please read the background and give me your thoughts:



My plane has a tendency to turn to the right (ball in center) but the
right wing drops a lot!



The incidence is fine ... the rigging is fine ... I even put a trim tab
on the right wing ... and adjust it severely "up" to lift the wing.  It
did NOTHING to help.



My conclusion, after many hours of flying is that the stick itself (in
the plane) has a weird pressure on it when under an air "load",  The
stick wants to snap to the right (meaning the bottom of the stick snaps
or pulls to the left).



Something strange is going on.  The tendency begins when ground rolling
and gets worse with speed!



Why?  I don't know!



Is it in the design ... the way the elevator push-pull rod attaches to
the stick?



Does air movement over the elevator somehow put side pressure on the
stick?



I am baffled.



Any ideas?



Tom Martino




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