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  #1  
Old 05-06-2020, 07:52 PM
jaybhansen jaybhansen is offline
 
Join Date: Feb 2018
Location: Simi Valley
Posts: 27
Default RV12 roll right

Just getting my rv12 in the air after 4 years. I have an issue of it rolling to the right. Not noticeable at pattern speeds, but requires a fair amount of left force at cruising. I have tried 'pinching' the left aileron of couple of times. No help. Should I be adjusting the ailerons? High wing up or low wing down?
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  #2  
Old 05-06-2020, 09:25 PM
Crafting N112DR's Avatar
Crafting N112DR Crafting N112DR is offline
 
Join Date: Oct 2013
Location: Powell, OH
Posts: 300
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Quote:
Originally Posted by jaybhansen View Post
Just getting my rv12 in the air after 4 years. I have an issue of it rolling to the right. Not noticeable at pattern speeds, but requires a fair amount of left force at cruising. I have tried 'pinching' the left aileron of couple of times. No help. Should I be adjusting the ailerons? High wing up or low wing down?
Been working the same exact issue right Heavy Wing, except when full flaps are applied both sides are equal. I?m still working the issue. On my fourth test Flight.
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  #3  
Old 05-06-2020, 10:00 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
Posts: 7,856
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Quote:
Originally Posted by jaybhansen View Post
Just getting my rv12 in the air after 4 years. I have an issue of it rolling to the right. Not noticeable at pattern speeds, but requires a fair amount of left force at cruising. I have tried 'pinching' the left aileron of couple of times. No help. Should I be adjusting the ailerons? High wing up or low wing down?
Adjusting ailerons up or down won?t help. They?ll just equilibrate in flight. Something more subtle. Check angle of attack both sides, compare aileron hinge lines?vertical heights, ...
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  #4  
Old 05-06-2020, 10:13 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 3,163
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Add trim tabs. Not elegant, but effective.
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  #5  
Old 05-07-2020, 12:56 AM
rgmwa rgmwa is offline
 
Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,675
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Has been discussed here before at various times:
http://www.vansairforce.com/communit...t=aileron+roll
Shape of wing skin training edge has a significant effect on roll, but is easy to adjust.
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  #6  
Old 05-07-2020, 02:30 AM
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Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,562
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I bought my 12 from original owner with 48TT. The airplane had a small trim tab fastened to the left flaperon with double-sided tape. It worked but the trim tab looked obnoxious and tape isn’t exactly structural. I removed the trim tab and the plane flew with a very heavy right wing.

I checked and adjusted the straightness of the upper wing skin that trails behind the spar and also squeezed the trailing edge of the flaperons. Neither solution fixed the problem.

What I did find extremely effective was changing the height of the flaperon pivots. Its been several years now, so I can’t remember exact adjustments, but basically what you want to do is raise flaperon pivot on one wing and lower pivot on the other wing. Perhaps start with ½ turn up on right wing and ½ turn down on left wing and test fly. Again, I can’t remember which flaperon I raised and lowered. No big thing – just note the change and test fly. First test flight will tell you if you’re adjusting in correct direction. If wing is heavier in flight then do opposite correction.

I believe I ended up changing pivot heights by one turn of the rod ends. One wing one-turn up and the other wing one-turn down. Plane now flies hands-off and ball is centered in cruise flight. Deploying flaps anywhere in the white arc is still hands-off level flight.


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  #7  
Old 05-07-2020, 05:25 AM
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mike newall mike newall is offline
 
Join Date: Jan 2005
Location: Yorkshire, England
Posts: 2,196
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Behold..... The Omgomulator !

This can put a lot of pressure on the trailing edge so use it very sparingly. It took 3 flights on the first RV12 and 2 flights on the second RV12 to make it fly hands off wings level.

Make sure you take time to round the corners, dimensions can be seen, plumbers pliers applies the pressure. It needs small and multiple tiny squeezes, sight down the trailing edge and check for pillowing.

Also consider lateral loading - if you have a passenger and a full tank, it makes a difference !

Be careful !





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  #8  
Old 05-07-2020, 09:58 AM
HDDAHL HDDAHL is offline
 
Join Date: Feb 2007
Location: hilton head sc
Posts: 97
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is it more pronounced with flaps deployed/?

HDDAHL
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  #9  
Old 05-07-2020, 10:40 AM
DTARM1 DTARM1 is offline
 
Join Date: Feb 2016
Location: Planet Earth (and it's lonely here)
Posts: 53
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Quote:
Originally Posted by jaybhansen View Post
Just getting my rv12 in the air after 4 years. I have an issue of it rolling to the right. Not noticeable at pattern speeds, but requires a fair amount of left force at cruising. I have tried 'pinching' the left aileron of couple of times. No help. Should I be adjusting the ailerons? High wing up or low wing down?
Cable tensions
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  #10  
Old 05-07-2020, 02:16 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
Posts: 7,856
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Quote:
Originally Posted by Piper J3 View Post
I bought my 12 from original owner with 48TT. The airplane had a small trim tab fastened to the left flaperon with double-sided tape. It worked but the trim tab looked obnoxious and tape isn?t exactly structural. I removed the trim tab and the plane flew with a very heavy right wing.

I checked and adjusted the straightness of the upper wing skin that trails behind the spar and also squeezed the trailing edge of the flaperons. Neither solution fixed the problem.

What I did find extremely effective was changing the height of the flaperon pivots. Its been several years now, so I can?t remember exact adjustments, but basically what you want to do is raise flaperon pivot on one wing and lower pivot on the other wing. Perhaps start with ? turn up on right wing and ? turn down on left wing and test fly. Again, I can?t remember which flaperon I raised and lowered. No big thing ? just note the change and test fly. First test flight will tell you if you?re adjusting in correct direction. If wing is heavier in flight then do opposite correction.

I believe I ended up changing pivot heights by one turn of the rod ends. One wing one-turn up and the other wing one-turn down. Plane now flies hands-off and ball is centered in cruise flight. Deploying flaps anywhere in the white arc is still hands-off level flight.


+1
Do this. Raising the pivot point makes that wing ?heavier?. It?s pretty sensitive.
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