REFLECTOR: roll trim

Tue Feb 24 06:23:49 CST 2009

That's good to hear....so we can put to rest that 'unbalanced' rumor about ya?

Chuck Jensen 

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On Behalf Of aminetech at bluefrog.com
Sent: Monday, February 23, 2009 6:08 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: roll trim

Chuck, I turned it 90 and 180 degrees and the only thing that changed was the compass, so I've rotated the turn coordinator a bit and now the ball is centered.

John

--- cjensen at dts9000.com wrote:

From: "Chuck Jensen" <cjensen at dts9000.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Subject: Re: REFLECTOR: roll trim
Date: Sat, 21 Feb 2009 19:05:27 -0500

We are getting into small percentages here, but you might want to turn the plane around in the hangar 180 degrees from the direction it is setting now.  If the ball is still out the same direction and same amount (relative to the plane), then you can be dead-certain it needs adjusting.  It's an easy to do double-check before you start poking and gouging things.

Chuck Jensen 

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On Behalf Of aminetech at bluefrog.com
Sent: Saturday, February 21, 2009 12:32 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: roll trim

Thanks.  I just went to the hangar.  The ball is in the same, off-center position as when I'm flying, so it seems likely that the turn coordinator needs adjusting.  I'll check the wings per your recommendation.

John

--- lwcoen at hotmail.com wrote:

From: "Laurence Coen" <lwcoen at hotmail.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Subject: Re: REFLECTOR: roll trim
Date: Sat, 21 Feb 2009 10:47:59 -0600

John,

You need to find a level spot to park your plane.  Most hangers have floors that are nice and flat.  Your canard is a good place to check to see if the plane is level since it has a nice straight upper surface.  You should be able to get things level by adjusting tire pressures.  If the ball is centered, your good to go.  If not you may have to enlarge the instrument mounting holes a tad to adjust it.  This assumes that that your plane is built straight so that the wings are level when the canard is level.  Cross check by measuring the height above the floor at the wing tips to see if they are the same.  If you adjusted your tire pressure for leveling, be sure to re-inflate them to the proper pressure.

Larry Coen
N136LC
SE/RG Franklin/IVO 

From: aminetech at bluefrog.com 
Sent: Saturday, February 21, 2009 10:08 AM
To: Velocity Aircraft Owners and Builders  <mailto:reflector at tvbf.org> list 
Subject: Re: REFLECTOR: roll trim

What's a good way to check the ball mount?

--- KMis178813 at aol.com wrote:

From: KMis178813 at aol.com
To: reflector at tvbf.org
Subject: Re: REFLECTOR: roll trim
Date: Sat, 21 Feb 2009 10:32:56 EST

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> 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] On Behalf Of Douglas Holub
Sent: Friday, February 20, 2009 5:11 PM
To: 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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