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12-31-2016, 02:42 PM
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Join Date: Jun 2005
Posts: 434
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Elevator symmetry
I clamped my elevator counterbalance area level at front of elevators/stabilizer then drilled elevator horns but after installing washers and tightening the nut and bolt my right elevator counterbalance sticks up about 1/8 of an inch. I must have drilled at a slight angle for the slight offset. Trying to think about how to correct this and I am contemplating welding one hole closed and re-drilling. Would this be the best way to go about it?
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Dave Ford
Cadillac, Mi
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12-31-2016, 02:50 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by rvdave
.... I am contemplating welding one hole closed and re-drilling. Would this be the best way to go about it?
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You wouldn't be the first.
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Dan Horton
RV-8 SS
Barrett IO-390
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12-31-2016, 03:29 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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That is a good option.
Another that is acceptable is to elongate the hole with a 3/16" round file until you have the position you want and then weld the perimeter of a washer positioned over the new hole location.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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12-31-2016, 07:52 PM
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Join Date: May 2006
Location: LL10, Naperville, IL.
Posts: 68
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I fixed this problem by slightly enlarging the hole, getting it round and concentric with the other horn, then sleeving the enlarged hole with a shouldered washer turned up on a lathe.
Stewart Willoughby, 6 panel.
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01-01-2017, 12:44 AM
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Join Date: Jun 2005
Posts: 434
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Quote:
Originally Posted by rvbuilder2002
Another that is acceptable is to elongate the hole with a 3/16" round file until you have the position you want and then weld the perimeter of a washer positioned over the new hole location.
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I think I like that idea even better, is a 960-10 washer the one to use?
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Dave Ford
Cadillac, Mi
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01-01-2017, 02:05 AM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by rvdave
I think I like that idea even better, is a 960-10 washer the one to use?
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Yes, that will work fine.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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01-01-2017, 06:19 AM
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Join Date: Apr 2012
Location: West Fargo, ND
Posts: 1,073
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How is the alignment of the trailing edges of the elevators? Before you go any further run a straight edge (or even eyeball) the trailing edges, then check the counterbalance arm alignment with the H stab while the elevators are aligned and in trail.
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Derek Hoeschen
EAA Tech Counselor
RV-9A #92103 - N803DK
G3X, Superior XO-320, Dual Pmags, Catto 3B
www.mykitlog.com/dbro172/
1974 Bellanca Super Viking - N16AW - Flying
RV-8 #83565 - N184DK - building
1968 Mooney M20C - N6801N - Sold
1956 C-182 - N744W - Sold
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01-01-2017, 06:37 AM
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Join Date: Mar 2008
Location: houston, texas
Posts: 900
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Camber- Caster settings
We simply took some tubing and cut it beveled. then installed it with a longer bolt. It is much the same as using the Camber-Caster shimming on a cars front end adjustment. You make a couple of them, put one on the inside and one on the outside, Put the bolt through, bring the bolt up to just loose and then turn the bevel to get the alinement you wish. Kind of adjustable if you will. Hope this helps. Yours as always. R.E.A. III #80888
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01-01-2017, 07:14 AM
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Join Date: Jan 2015
Location: Prescott AZ
Posts: 95
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elevator symmetry
My elevator counterbalance are both equal around 3/8 to 1/2 in flight. Not being the builder how does this affect the airspeed/ drag?
Should I re-drill the elevator horn and repair?
Thanks for any input
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Larry Parham
RV-9A N65KW
2018-2019 dues paid thru June
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01-01-2017, 07:36 AM
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Super Moderator
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,626
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Quote:
Originally Posted by Larry Parham
My elevator counterbalance are both equal around 3/8 to 1/2 in flight. Not being the builder how does this affect the airspeed/ drag?
Should I re-drill the elevator horn and repair?
Thanks for any input
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Yours is not a matter of elevator horn alignment. It has to do with the flight loading and angle of the horizontal stabilizer. You can see the difference in the in-flight position of the elevators by loading to different CG's. A more pronounced AFT CG will have the elevators Counter balance horns riding in an UP position (meaning above the leading edge of the stabilizer). The airplane will also be aerodynamically lighter and somewhat faster. The converse is true for an aircraft with a forward CG--the horns will ride below the leading edge of the horizontal stabilizer, and the aircraft will be slower.
So, first I would check to see that your horizontal stab is set correctly as per the plans. If not, you can correct it with shims to raise it (knowing it will also affect the fit of your tail fairing).
I believe the total drag component will be the same, but Scott may want to weigh in here.
Vic
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 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
EAA Sport Aviation "Checkpoints" column
EAA Homebuilt Council Chair/member EAA BOD
Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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