REFLECTOR: roll trim

[KMis178813 at aol.com]

John
   I don't know of a measurement you can use. The goal is to make  sure that 
there is some air load on the rudder. I would imagine that not  every winget 
is set exactly the same so the airflow across the  outboard side would not be 
the same on every plane. That being said I have (and  have seen this) adjusted 
by eyeing up the rudder from the front of the winglet  making sure the rudder 
can see some air on the outboard side.
    Oh Yeah, make sure the ball mount is level before  adjusting the plane!!!
 
Ken
 
 
In a message dated 2/21/2009 9:01:02 A.M. Eastern Standard Time,  
aminetech at bluefrog.com writes:

 
Great discussion.  My ball indicates a little right rudder is needed  during 
straignt and level flight.  So I need to either add more shim to  the right 
rudder or remove some from the left.  Is there a critical  amount of concavity 
(space between the straight edge and where the rudder  attaches to the winglet) 
that avoids flutter?
 
John

--- douglas.holub at gmail.com wrote:

From: Douglas Holub  <douglas.holub at gmail.com>
To: Velocity Aircraft Owners and Builders  list <reflector at tvbf.org>
Subject: Re: REFLECTOR: roll trim
Date:  Fri, 20 Feb 2009 22:36:20 -0600

I'm on it. Thanks guys.


On Fri, Feb 20, 2009 at 8:31 PM, Al Gietzen <_ALVentures at cox.net_ 
(mailto:ALVentures at cox.net) > wrote:


 
Doug;
 
Make sure your  roll trim is centered. 
If the rudders  and tipsails (a.k.a. winglets) are properly aligned, and you 
don't have  asymmetric drag (like a big scoop on one side); then some shim 
washers on  the wing bolts are likely in order. Increase AOA on the right; 
decrease on  the left. I'd suggest having material about .030", and then it's trial 
and  error.
A straightedge on  the outboard side of the winglet/rudder should show a 
slight concavity; and  should be the same on both sides.  If so, also check that 
the straightedge makes the same angle to the  fuselage centerline on both sides 
(that's a little more difficult).  A  slight misalignment in rudder or 
tipsail can be corrected by shimming a  rudder outward – shim on the inboard edge. 
Any asymmetric drag can be  handled the same way; shim the  rudder opposite the 
drag.
 
Good  luck,
 
Al
 

 

-----Original  Message-----
From: _reflector-bounces at tvbf.org_ (mailto:reflector-bounces at tvbf.org)   
[mailto:_reflector-bounces at tvbf.org_ (mailto:reflector-bounces at tvbf.org) ]  On 
Behalf Of Douglas  Holub
Sent: Friday,  February 20, 2009 5:11 PM
To: _reflector at tvbf.org_ (mailto:reflector at tvbf.org) 
Subject: REFLECTOR: roll  trim

 
When I let go of the stick, the  plane wants to roll right. I plan on using 
the EZ-Pilot for aileron trim (I  haven't turned it on in flight yet), but I 
would feel better if the plane  flew straight hands free without the EZ-Pilot. 
What should I adjust? Should  I add a fiberglass trim tab outboard below the 
left  wing?

 


 
Doug  Holub
 
Velocity Standard FG w/ electric  nose  lift

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