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  #1  
Old 01-13-2019, 01:41 PM
Girraf Girraf is offline
 
Join Date: Dec 2017
Location: Southern Maryland
Posts: 203
Default Trim tab alignment

I'll admit that perhaps I overthought this part of the build, but I really wanted to do this just once. I won't bore you with the details of what I found challenging, but here is my final result. The hinge doesn't leave you any room for fore aft movement of the tab if you want any hope of preserving edge distance on those hinge attach rivets. You basically need to drill directly down the centerline of the hinge flange. Overall, I ended up with exactly 3/32 gap on the outboard edge (min distance per the plans, which I can file open slightly), and well matched inboard edge, and the tab itself sits about 1/32" in from the TE of the elevator. Again, due to the hinge edge distance issue, I don't think I had much control over how this ended up. I'm curious if that's a passable result or if I should have done something different to get a perfectly matched TE. Here are some pics. I can always order some new hinge and try again....

Side note: my Wings arrived this weekend!




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  #2  
Old 01-13-2019, 05:04 PM
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wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
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Default Trim tab

Looks fime to me. If edge distance is met, build on.
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Estes Park, CO
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Donated 01/01/2021, plus a little extra.
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I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #3  
Old 01-14-2019, 09:32 AM
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bjdecker bjdecker is offline
 
Join Date: Jun 2005
Location: Georgetown, TX
Posts: 950
Default Trim Tab mods...

After you finish up the elevator skeleton, skin, and put the bend in, tape/clamp a piece of 4' - 5' long AA3-3/4x3/4 to the left elevator trailing edge in the apex of the angle. Clamp a similar piece of angle along the right edge of the elevator, long enough to touch - or almost touch, the other angle.

Now position the trim tab using the two angle pieces. Provide a 1/8" - 3/16" gap between the left edge of the trim tab.

In my installation, I used the extruded hinge material (MS20001) with different halves -- P3 and P4 (I think) to give me additional edge distance.

Cheers!

b
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  #4  
Old 01-14-2019, 03:34 PM
Girraf Girraf is offline
 
Join Date: Dec 2017
Location: Southern Maryland
Posts: 203
Default

I did use a piece of angle iron clamped to the elevator TE to help with alignment. I suppose in the end, I chose to maintain 2D edge distance on the hinge holes instead of getting the TE to align perfectly. I'm wondering now if that was the better of the two choices...
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  #5  
Old 01-14-2019, 03:42 PM
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rzbill rzbill is offline
 
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Location: Asheville, NC
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Default

Girraf,
If memory serves, the flap hinges are the same way. You have to be spot on target with the hole positions to keep from busting edge distance on either the hinge or the airframe. Patience and accurate workmanship will get you through.
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  #6  
Old 01-14-2019, 05:15 PM
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wirejock wirejock is offline
 
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Location: Estes Park, CO
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Default Hinges

Quote:
Originally Posted by rzbill View Post
Girraf,
If memory serves, the flap hinges are the same way. You have to be spot on target with the hole positions to keep from busting edge distance on either the hinge or the airframe. Patience and accurate workmanship will get you through.
I recommen buying a section of the wider flange hinge for the flaps. Use 1/2 on each side. No hole edge distance issues. Also have a neat trick for drilling them. Check my blog.
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Larry Larson
Estes Park, CO
wirejock at yahoo dot com
Donated 01/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
Empennage, wings, fuse, finishing kit, now FWF
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #7  
Old 01-14-2019, 07:03 PM
Girraf Girraf is offline
 
Join Date: Dec 2017
Location: Southern Maryland
Posts: 203
Default

Well I couldn?t not call vans about this just to get their opinion. Talked to Mitch (as in the president maybe?). Anyway, he said if I could live it, then he could live with it. .

Roger that, moving on!
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