REFLECTOR: STICK & RUDDER

[Rene Dugas]

If one is going to do flutter and max VNE testing please consider your
escape route if it occurs thoroughly.  Consider a parachute and a chase
plane.  Pull up to loose speed and load the controls, deploy rudders- 

Both.  Hand on the throttle.  Just my short list.  Been to 220 knots
indicated.

Rene'

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Scott Derrick
Sent: Monday, March 26, 2007 9:42 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: STICK & RUDDER

 

Tom,

I would first verify your "ball" is set correctly.  You know the drill,
level the plane, check the ball.  If you have the standard fuel set up
with a single cutoff switch, you fuel burn will act as a yaw sensing
device. If the plane is not trimmed correctly(everything else according
to hoyle, ie, fule caps tight, no leaks in vent system, etc.) you will
have uneven fuel consumption between the left and right fuel tanks..  

If you do have even fuel flow, verified with at least an hours level and
straight cruise test, I'd adjust the ball in flight to register in
between the lubber lines.  If the fuel flow is not even shim the right
rudder out a bit more.

Regarding the right rudder flutter.  That should be dealt with no matter
what the yaw situation is.  Have you called the factory and asked about
that?   Do you get the flutter in a hard roll with out using any rudder?
Or half rudder?  

You asked a while ago about how fast to test for flutter. I'd recommend
you test for 10 to 20% higher than your fast cruise speed.  Test at
altitude. Test carefully, 5 knot increments using the knock method on
the controls. 

Scott


Tom Martino wrote: 

At first I thought it was just the weather, or maybe an uneven fuel load
. but I can no longer deny it.  My plane still yaws a bit to the left
(which means I have to touch the right rudder to make it fly perfectly
straight).  So I have the following questions and would like those with
more experience to answer:

 

1.      The ball is only a tiny bit out of center and I can get speeds
of 200 KTAS or more . so should I leave the damn thing alone?

2.      The plane is almost perfect ... so should I make it fly
perfectly?

 

I should also make these observations:

 

--I already shimmed the wings with washers several hours ago - which
helped a lot . but there is still a slight yaw,

--I also shimmed the right rudder out a bit (right after I did the wing)
. it seemed near perfect . but still a tiny yaw.

--When I am at higher speeds (170+ TKAS) and make a hard right turn with
full right rudder . the right rudder will flutter a bit.

--When turning left at the same speed . no flutter at all.  Is this
because I shimmed the right rudder out a bit to begin with?

 

ANY AND ALL COMMENTS APPRECIATED.

 

I have taken a lot of time to make this an exceptional bird . am I going
too far?  

 

Tom Martino

 





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-- 
 
-
    As nightfall does not come at once, neither does oppression. In both
instances, there is a twilight when everything remains seemingly
unchanged. And it is in such twilight that we all must be most aware of
change in the air however slight lest we become unwitting victims of the
darkness.
 
    William O. Douglas, Justice of the U.S. Supreme Court 
 
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