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03-15-2013, 02:08 PM
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Join Date: Jan 2005
Posts: 37
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bank when lowering flaperons
We have been having fun trying to correct a left roll when lowering the flaperons to the flap positions. Has anyone else had this problem? All pertinent SBs are up to date.
Thank you
John Foy 
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03-15-2013, 02:11 PM
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Join Date: Oct 2007
Location: Pensacola, FL & 2R4, Loveland, CO
Posts: 222
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John,
Do not know if this helps, but lowering the flaps changes the stick's neutral roll position.
-Dave
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120500
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03-15-2013, 03:50 PM
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Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
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Check the flaperon hinges under the wing. Make sure the bearings are all screwed equal distance into the wing.
Joe Gores
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03-15-2013, 04:12 PM
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Join Date: Mar 2011
Location: Bosschenhoofd, Netherlands
Posts: 152
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Same problem here.
When the aileron trimtab is ok for cruise speed the flaps cause a right bank.
Was not able to get the roll out by pinchincg the ailerons
__________________
Jack Netherlands
PH-SEP and PH-SES
RV12 #120519 and #120790
Hobbs 700+ hours and 400+ hours
Dual SV1000 Skyview 15, Pocket FMS and Powerflarm 6.0 (ADSB)
RV10 PH-USN Hobbs 350 hours
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03-15-2013, 05:17 PM
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Join Date: Jul 2009
Location: High Wycombe, UK
Posts: 288
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Ours does the same.
My thinking is that the flaperon linkage pivot is offset to one side so that as the flaperons are moved down, one flaperon actuating pushrod moves further than the other being further away from the pivot.
Thoughts?
__________________
Jerry Parr
England
Ex RV-12
Loving Rotax....
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03-15-2013, 11:06 PM
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Join Date: Dec 2011
Location: Georgetown, Texas
Posts: 184
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What??
Wasup, Scott?
__________________
Dick Gossen
gossend@gmail.com
Flying: EAB RV-12 with Aeromomentum AM15-HP engine
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03-16-2013, 12:31 AM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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I have flown 5 different RV-12's and none of them have behaved this way.
That leads me to believe that it is possible to make adjustments to resolve it
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03-16-2013, 03:41 AM
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Join Date: Mar 2011
Location: Bosschenhoofd, Netherlands
Posts: 152
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I was unable to make it fly level by pinching until it starts to look ugly.
Added a little trim tab on one flaperon and its perfect around 100 knots and i can let go of the stick.
When i put flaps in the first detent or second it starts rolling and needs some stick correction, but its not annoying to me as it is not a lot.
I checked for any differences in angles and pivot points but cannot see any.
I would have thought it is pure related to engine torque.
__________________
Jack Netherlands
PH-SEP and PH-SES
RV12 #120519 and #120790
Hobbs 700+ hours and 400+ hours
Dual SV1000 Skyview 15, Pocket FMS and Powerflarm 6.0 (ADSB)
RV10 PH-USN Hobbs 350 hours
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03-16-2013, 04:35 AM
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Join Date: Oct 2011
Location: Manchester, UK
Posts: 9
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Effects of Controls
Ours roll too when flying "hands off" and selecting flap.
Only noticed when I was running through an "Effects of Control" lesson with my passenger prior to my instructor renewal.
In normal "hands on" flying the pilot simply corrects for it automatically.
John.
Last edited by jstamper : 03-16-2013 at 04:38 AM.
Reason: Correction
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03-16-2013, 08:52 AM
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Join Date: Jun 2009
Location: Dayton, OH
Posts: 838
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143WM rolls, too
But it's more noticeable with one notch of flaps than with 2. It's not a big deal unless you let go of the stick. Now on takeoff with full power and one notch of flaps there's a lot of left stick needed, but that's to counteract the right rudder.
I'm betting that those of us with left roll with one notch of flaps at approach speed also have quite a bit of rudder trim tab-- I have almost 1 3/4 Avery tabs. Tabs move ruder to the right, airplane yaws, and rolls left. I'll have to see what happens at 65 knots without flaps next time I fly.
My semi-educated guess is that the whole roll/trim tab issue is a function of bot getting those &*^%&^$^$&^%&^ longerons bent just right and having the whole aft fuselage just a hair out of alignment.
Wayne 120241/143 WM
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