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  #1  
Old 04-01-2018, 03:57 PM
Chippster1 Chippster1 is offline
 
Join Date: Aug 2011
Location: Marietta, Ga
Posts: 47
Default Strange left yaw

Hello all you pilots out in VAF land.

I have an RV-10 which I bought about 5 years ago and have been battling this problem for about 3 years. Sometimes I have to put a lot of right foot in to keep the ball centered and sometimes I donít. It has been such a mystery. I have had several good people look at the plane, including Vic Syracuse of Baseleg aviation.
Vic had found an asymmetry of the fiberglass fairing on the top of the vert stab, so we replaced it and the plane was better for a while. Then I noticed it warped again so I removed it and bonded a brace inside the fiberglass to hold itís shape.
The problem seems to be creeping in again, but the top fairing is holding itís shape well. The wheel and gear leg fairings also look straight and parallel
Any aerodynamicists want to lend me their 2 cents?
Iím all ears
Ted Chipps
N498EC
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  #2  
Old 04-01-2018, 04:01 PM
az_gila's Avatar
az_gila az_gila is offline
 
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 9,743
Question

Perhaps mechanical rather than aerodynamic?

Something like a groove worn bushing in the rudder cable path from pedal down the tunnel and aft fuselage.
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EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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  #3  
Old 04-01-2018, 04:02 PM
Chippster1 Chippster1 is offline
 
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Location: Marietta, Ga
Posts: 47
Default

Not sure how a worn bushing would make it yaw?
The rudder pedals move quite freely
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  #4  
Old 04-01-2018, 04:03 PM
az_gila's Avatar
az_gila az_gila is offline
 
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 9,743
Smile

Friction and hanging up on one rudder cable keeping the rudder deflected a bit and not centering...
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Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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  #5  
Old 04-01-2018, 04:10 PM
rocketman1988 rocketman1988 is offline
 
Join Date: Jun 2010
Location: Sunman, IN
Posts: 1,193
Default Nose gear

Check the breakout force on the nose gear. Once the airplane is in the air, even a slight displacement of the nose gear from Center will cause a corresponding yaw.

There is a video out there on this happening in flight. The nose gear breakout for e was increased to stop the problem...
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Aerospace Engineer '88

RV-10
Structure - 90% Done
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Doors - Done
On Gear
290 HP Barrett Hung
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  #6  
Old 04-01-2018, 04:11 PM
Chippster1 Chippster1 is offline
 
Join Date: Aug 2011
Location: Marietta, Ga
Posts: 47
Default

Like I said, the pedals move quite freely without and friction or hang up
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  #7  
Old 04-01-2018, 04:27 PM
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Mel Mel is offline
 
Join Date: Mar 2005
Location: Dallas area
Posts: 10,150
Default

The point Rocketman is making is that the nose wheel may not be staying straight in flight, thereby inducing a turn.
It is NOT connected to the flight controls.
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Mel Asberry..DAR since last century
A&P/EAA Tech Counselor/Flight Advisor/Nat'l Test Pilot School
Specializing in Amateur-Built and Light-Sport Aircraft
<rvmel(at)icloud.com>
North Texas (8TA5)
RV-6 Flying since 1993, 172hp O-320, 3-Blade Catto (since 2003)
Legend Cub purchased 12/2017
FRIEND of the RV-1
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  #8  
Old 04-01-2018, 05:06 PM
Chippster1 Chippster1 is offline
 
Join Date: Aug 2011
Location: Marietta, Ga
Posts: 47
Default

Yes I understand that. My response about the rudder pedals were to the other guy that suggested checking the rudder cables
We all know that RV nose gears are free castering
We learned that the first time we flew an RV
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  #9  
Old 04-01-2018, 05:14 PM
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Auburntsts Auburntsts is offline
 
Join Date: Jan 2005
Location: Dumfries, VA
Posts: 2,590
Default

Quote:
Originally Posted by Chippster1 View Post
Yes I understand that. My response about the rudder pedals were to the other guy that suggested checking the rudder cables
We all know that RV nose gears are free castering
We learned that the first time we flew an RV
Ok, weíre just trying to help and the because you werenít the builder you might not be aware of the nose gear breakout force and the fact that it needs to be checked and adjusted periodically as the parts wear and loosen and can lead to the condition you are describing.
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  #10  
Old 04-01-2018, 05:26 PM
Chippster1 Chippster1 is offline
 
Join Date: Aug 2011
Location: Marietta, Ga
Posts: 47
Default

Will check breakout force next
I believe 28lbs at the axle nut correct?
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