REFLECTOR: RIGGING

Wed Aug 31 10:00:07 CDT 2005

Scott,

Good data, but I hope you aren't telling us that the 215 kts was straight and level...

I've trimmed mine such that it is about 1/8" insie the winglet, but I've had no indication of flutter at 210kts (in a modest dive!).  I've not testing it in a turn, but I can see how that would make a difference.  I suspect there's enough variation in the angle of incidence of the winglets that flush with the winglet may not be the final inboard limit, though that's probably close.

Chuck

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Scott Derrick
Sent: Wednesday, August 31, 2005 10:41 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: RIGGING

Yes, the rudder must not extend inboard of the winglet trailing edge, AT 
ALL.  I had adjusted mine about 1/16 of an inch inboard,  was in a 
diving turn and at about 170 knots indicated and experienced moderate 
flutter.  Later when  trying to reproduce it to verify what was causing 
the flutter I was in a straight dive and it happened at 185 knots.  Now 
that the rudder inboard side is 1/32 outboard of the winglet inboard 
side I've tested it to 215 knots indicated, solid as a rock.

Scott

Chuck Jensen wrote:

>Scott,
>
>Did you ascertain any reference point against anything else that you can now say was 'too far'?
>
>Chuck
>
>-----Original Message-----
>From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Scott Derrick
>Sent: Tuesday, August 30, 2005 10:50 PM
>To: Velocity Aircraft Owners and Builders list
>Subject: Re: REFLECTOR: RIGGING
>
>I will second or third the "be very careful when bringing a rudder 
>inboard".  Been that and done there..
>
>After doing so, be sure to do a thorough flutter test by increasing your 
>speed in 5 knot increments up to redline. Be ready to step on the 
>rudders and pull the throttle if you feel any undo vibration.
>
>Scott
>
>Jim Sower wrote:
>
>  
>
>>On swept wings, rudder influences roll more than straight wings. I 
>>would not worry about shimming the wings until I had the ball centered 
>>with rudder trim (as you have done). It doesn't take much of an error 
>>in winglet alignment to generate a good bit of yaw. I'm not sure where 
>>you're measuring the 1/4", but you might be able to reduce that a 
>>little by reducing the deflection of the other rudder a little. Be 
>>SURE to NOT reflex it past neutral since that invites flutter. Be VERY 
>>careful if you try to even them out this way.
>>My .02 ... Jim S.
>>
>>Tom Martino wrote:
>>
>>    
>>
>>>I am approaching my 40 hours (20 for plane, 20 for engine) ... and I 
>>>have finally gotten the plane to fly straight and level by shimming 
>>>my left rudder (it sticks out about ¼ inch) ... I glued a rubber stop 
>>>to the inboard edge of the wing (where the rudder rests).
>>>
>>>I would like to check my reasoning here to see if I corrected the 
>>>problem correctly and made accurate assumptions:
>>>
>>>When first attempting to fly straight and level with "hands and feet 
>>>off" ... the bubble was out to the left and the nose pointed slightly 
>>>to the right and the left wing wanted to rise.
>>>
>>>I assumed this condition as caused by a yaw problem (rudder trim 
>>>correctable) rather than a wing incidence problem.
>>>
>>>I figured ... if it was just a wing-incidence problem, the yaw would 
>>>not necessarily be off. On the other hand ... a yaw problem alone could 
>>>cause the outboard wing to lift.
>>>
>>>Since shimming the rudder was the easiest thing to do, I shimmed it! 
>>>That correct the yaw problem and the wings now stay level.
>>>
>>>So here is my question: Did I make the correct assumptions? Could I 
>>>actually have a wing-incidence problem ... that is now being masked by 
>>>the shimmed rudder?
>>>
>>>Had I adjusted the wing incidence ... would that have corrected the yaw 
>>>and wing lift problem?
>>>
>>>I know that this sounds complicated ... but I simply want to know that 
>>>I am attacking the problem in the right spot.
>>>
>>>Thanks in advance for your opinions.
>>>
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>>    
>>
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