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Old 01-19-2015, 03:09 PM
control control is offline
Join Date: Feb 2006
Location: Stockholm, Sweden
Posts: 607
Default Elevator horn alignment, fix or ok?

So, this weekend I mounted the elevators to the spar. Measured many times, marked it, drilled the hole in one of the elevator horns... Made a good drill block guide, remeasured, clamped and drilled the second rudder horn.

Somehow the elevators managed to move and the holes, while square are not in perfect alignment. The two pictures show how the left is aligned when the right side is flush.

A disaster that needs to be fixed or nothing to worry about???

RV-14 kit #140138
I have entered the 90% done, 90% left to do zone
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Old 01-19-2015, 09:21 PM
jimbo jimbo is offline
Join Date: Apr 2006
Location: Howell, MI
Posts: 283

My vote is disaster needing to be fixed.

With that much off the trailing edges right vs left can't be straight.

My 2 cents worth.

RV9a flying
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Old 01-19-2015, 09:41 PM
longline longline is offline
Join Date: Sep 2014
Location: silverdale, WA
Posts: 207
Default alignment

I am not know if the alignment is that critical, I simply have nothing to compare with. I do, however, have an appreciation of steel. The weldment can be filled by welding and filed flat. Then re-drill in an appropriate spot.

The only issue is that the plastic finish on the weldment is going to be ruined in the heat affected zone. I just ground it off, feathered it with sandpaper and finished it with rattle can of choice. Someone else may have a better idea.
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Old 01-19-2015, 09:49 PM
aturner's Avatar
aturner aturner is offline
Join Date: Jan 2005
Location: Clarion, Pennsylvania
Posts: 504

My vote is that you need to sight along the trailing edge to determine if they are aligned or not. The horn attachment has its own issues, and you can have elevators that are in perfect alignment, but the counterweight horns are a bit out of alignment. For what it is worth, the horns on my elevators are worse in terms on non-alignment, but the trailing edges are lined up, and it flies fine.
-Andy Turner
RV-10 N784JC

Last edited by aturner : 01-19-2015 at 09:52 PM.
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Old 01-19-2015, 09:52 PM
Mel's Avatar
Mel Mel is offline
Join Date: Mar 2005
Location: Dallas area
Posts: 10,213

Mine was off at least that much if not more for about 20 years.

A few years ago I decided to "fix" it. After the fix, I noticed absolutely no change in flight characteristics or speed.

If the cosmetic aspect bothers you, then fix it. Otherwise, build-on!
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
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
Eagle's Nest Mentor
Recipient of Wright Brothers "Master Pilot" Award
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Old 01-19-2015, 10:40 PM
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Dbro172 Dbro172 is offline
Join Date: Apr 2012
Location: West Fargo, ND
Posts: 1,045

shoot, mine are twice that bad.... but the trailing edge of both my elevators are perfectly straight., because i clamped them to an 8' piece of aluminum angle before drilling the horns.

I think only a repeat offender could have the wherewithal to have perfectly aligned counterweights AND trailing edges. I would surmise that misaligned trailing edges would induce a corkscrew like flight characteristic moreso than offset counterweights. And since I never park with my H-stab/elevators aligned, nobody will ever know
Derek Hoeschen
EAA Tech Counselor
RV-9A #92103 - N803DK
G3X, Superior XO-320, Dual Pmags, Catto 3B

RV-8 #83565 - N184DK - building
1968 Mooney M20C - Sold
1956 C-182 - Sold
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Old 01-20-2015, 02:00 AM
control control is offline
Join Date: Feb 2006
Location: Stockholm, Sweden
Posts: 607

Thanx for all the replies. I think I will let it be for now, perhaps this will make me the first one with a heavy right wing
RV-14 kit #140138
I have entered the 90% done, 90% left to do zone
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