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Old 02-23-2013, 01:43 PM
330Jock 330Jock is offline
Join Date: Jul 2011
Location: Norfolk, VA
Posts: 123
Default Stupid Trim Tab!

OK guys. Need your opinions! Tried to do everything right: hardwood, carpet tape, big clamps. But it moved a little anyway. The small bends turned out fine, but the trailing edge of inboard side of trim tab moved a little. Is this trash or am I being too critical. Honest opinions of what you would do if this was yours. By the way I've already ordered new parts so you won't hurt my feelings either way.

Bill Stockburger
RV-7A Slider
IO-360 M1B Thunderbolt delivered, Hartzell 74" Composite delivered.
Empennage Finished (except fiberglass), Wings Finished (except FG), Fuselage in progress. Restarted project 6/15/2020
N776DD (Reserved)
2021 Dues Paid

The test of a first-rate intelligence is the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function. - F. Scott Fitzgerald

Last edited by rv6rick : 02-25-2013 at 07:28 AM. Reason: removed expletive
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Old 02-23-2013, 02:52 PM
edbooth edbooth is offline
Join Date: Feb 2006
Location: Trenton, SC
Posts: 120
Default trim tab

Guess it depends on your acceptance level...When building an RV-6 and RV-7, I ended up building two on each project to get the one I liked. Guess I forgot what I had learned on the first project...
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Old 02-23-2013, 03:05 PM
gasman gasman is offline
Join Date: Mar 2007
Location: Sonoma County
Posts: 4,134

Drop an 1/8" dowel in there and re shape it the way you want it. You are so close.
VAF #897 Warren Moretti
2020 =VAF= Dues PAID
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Old 02-23-2013, 04:44 PM
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Dbro172 Dbro172 is offline
Join Date: Apr 2012
Location: West Fargo, ND
Posts: 1,076
Default Oak Jig

It took me four! - The key was to make the proper jig.

The most important part in this wood jig is where the tip of the trinagle piece stands proud, about 1/8", past the end of the larger piece and is blunt at the end to fit the inside corner. THis allows you to clamp down very very tight without ruining anything else. Once the tab is clamped in i made the bend with a mallet and flush rivet set.

Yours maybe okay, I trashed a couple about like that. I was able to get it perfect once I figured out this jig.

Derek Hoeschen
EAA Tech Counselor
RV-9A #92103 - N803DK
G3X, Superior XO-320, Dual Pmags, Catto 3B

1974 Bellanca Super Viking - N16AW - Flying
RV-8 #83565 - N184DK - building
1968 Mooney M20C - N6801N - Sold
1956 C-182 - N744W - Sold

Last edited by Dbro172 : 02-23-2013 at 04:49 PM.
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Old 02-23-2013, 04:49 PM
David Paule David Paule is online now
Join Date: Dec 2009
Location: Boulder, CO
Posts: 5,063

Once you've forced the trailing edge into shape, you can easily file off that little bit of overhang shown in the last two photos.

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Old 02-23-2013, 07:53 PM
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frazitl frazitl is offline
Join Date: Jan 2005
Location: Las Vegas, NV
Posts: 488
Default I have an unaltered rv7 (a) trim tab

if you need it. I went the mini rib route see my post in: .

New skin from Vans $18 + shipping. I'll send for $15 including shipping conus.
Terry F.
RV 7A N457RV
250 hours and lovin it!
Southern Nevada EAA Chapter 1300 -

Paid VAF 03/17
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Old 02-25-2013, 10:06 AM
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Veetail88 Veetail88 is offline
Join Date: Oct 2008
Location: Hales Corners, WI
Posts: 1,016
Default With so much trouble with these

you would think someone with really good tooling would bend these for folks for 10 or 20 bucks. Allan, here's your new product.

Being finished with the aluminum work on my QB -8, I've found little use for the knowledged gleaned from making that part, other than learning to deal with frustration. I'm thinking that isn't a critical skill. (except of course it makes you an around more skilled and experienced building, but I'd trade that away for this one)
Jesse Bentley
N229Z - RV-8 - Flying - Livin' the dream!
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Old 02-25-2013, 03:21 PM
rv8gibbo rv8gibbo is offline
Join Date: May 2012
Location: Maitland, Australia
Posts: 99

After 3 attempts I found this method to work best, I also screwed timber behind the wedge to stop it slipping back.
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Old 02-26-2013, 12:46 AM
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mvidalr mvidalr is offline
Join Date: Aug 2011
Location: Monterrey, Mexico
Posts: 121
Default Riblets

I went for the riblet attempt. I really liked the way things turned out.
I also made this post as detailed as I could.
Hope it helps
Miguel Vidal
EAA #1133587
RV-8 SB Wings in Monterrey, Mexico
N511MV Registered
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Old 02-26-2013, 01:06 AM
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Andy Hill Andy Hill is offline
Join Date: Dec 2005
Posts: 976

Put the Trim Tab in a box, and the replacement parts. Move on.

Come back to the Trim Tab in X years time when you've built the rest. Decide if the rest of the aircraft is so perfectly built that this minor imperfection is the most significant problem - if so, rebuild Trim Tab
Andy & Ellie Hill
RV-3B G-HILI very slow build
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