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Old 11-24-2020, 12:31 PM
LCampbell LCampbell is offline
Join Date: Dec 2018
Location: Columbia, MO
Posts: 27
Default Trailing Edge Wedge Protusion Question

I'm just finishing my ailerons on my RV-10, and so far they are tuning out great, however I have a question...

I know that the exact point of the trailing edge can have an effect on the control surface's behavior, but am not clear on what causes what.

I seem to have on both of them a thin bit of the wedge that sticks out a bit further than both the top and bottom skins the same amount. I know I didn't take that much off when deburring the skins, and besides, it's exactly consistent the entire length.

Would you:
1. Run a file along the protruding edge to even it up?
2. Know that paint will make it a non issue?
3. Be prepared for wild and bizarre roll sensitivity?
4. Ignore it, build on, and spend more brain cells contemplating deserts for the upcoming holiday?

Any thoughts welcome,

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Old 11-24-2020, 01:37 PM
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wirejock wirejock is offline
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 4,071
Default Wedge

I would ask Vans before removing material. I've seen some stuff on the 10 and 14 I thought looked odd but Vans designed it that way.
Seems like a sharp edge is preferable to a wide curve?
Larry Larson
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Old 11-24-2020, 01:42 PM
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Steve Melton Steve Melton is offline
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Location: Cincinnati, OH
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that trailing edge looks good to me. looks same as the -9. nice workmanship.
Steve Melton
Cincinnati, OH
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Old 11-24-2020, 01:51 PM
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rvbuilder2002 rvbuilder2002 is offline
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,160

The protruding amount of AEX wedge is designed in on purpose.
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
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Old 11-24-2020, 01:55 PM
terrye terrye is offline
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Location: Vancouver, BC, Canada
Posts: 903
Default Trailing Edge Wedge Protusion Question

I filed all of my trailing edge wedge protrusions flush with the top and bottom skins. I think the control surface sensitivity comes mostly from the RV-6 type ailerons where there is a rounded trailing edge. This can result in unstable (oscillating from top and then bottom) vorticies. Many aerobatic planes have a really large square trailing edge to eliminate this, as does the RV-14 elevator. If in doubt, discuss with Vans.
Terry Edwards
RV-9A (Fuselage)
2020/2021 VAF Contribution Sent
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Old 11-24-2020, 02:18 PM
PilotjohnS PilotjohnS is online now
Join Date: Jan 2016
Location: Southwest
Posts: 1,222
Default Just me

I tried to eliminate this AEX edge sticking out, but the double flush rivet heads would then touch and come out poor. So I left the AEX wedge stick out like you have it. After the proseal dried for a week, I took a file and made a blunt edge by filing the AEX wedge down to the skin edge. Came out really nice.
John S

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Old 11-24-2020, 02:34 PM
scsmith scsmith is offline
Join Date: Jan 2008
Location: Ashland, OR
Posts: 2,705

Originally Posted by rvbuilder2002 View Post
The protruding amount of AEX wedge is designed in on purpose.
Scott, I am curious about the rationale for leaving the extrusion protruding?

I would be inclined to file it flat and square. This would create a small base to the trailing edge that has lower hinge moment than a sharp trailing edge, but a little higher drag. (lower hinge moment means lighter stick forces)

But the step shape of the trailing edge with the two skin steps to the sharp extrusion probably has similar drag to the squared off base, and I don't think it will provide any hinge moment reduction.
Steve Smith
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