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Old 08-10-2021, 03:23 PM
RV-Ogler RV-Ogler is offline
Join Date: Aug 2021
Location: California
Posts: 13
Default Edge distance questions

I buggered up a hole drilling out a rivet on my RV14 rudder and had to up size the No 4 rivet to a No 5. Waiting to hear what Vans says about it, part R-606PP. Is the distance measurement 2X diameter from the center of the hole?

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Old 08-10-2021, 04:39 PM
Norman CYYJ Norman CYYJ is offline
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Location: Victoria B.C.
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From the center of the rivet being installed.
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Old 08-10-2021, 04:41 PM
Girraf Girraf is offline
Join Date: Dec 2017
Location: Southern Maryland
Posts: 193

Yes, Edge Distance is measured from the center of a hole to the material edge.

That hole doesn't look bad to me but I'm not sure if that pre or post upsizing to #5 rivet hole.
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Old 08-10-2021, 04:44 PM
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wirejock wirejock is offline
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Location: Estes Park, CO
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Default Edge distance

Depends a little on material but typically 2D from center of hole to any edge. I do suggest practicing on drilling rivets. Ask if you need some best practice advise.
Larry Larson
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Donated 01/01/2021, plus a little extra.
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Old 08-10-2021, 05:01 PM
RV-Ogler RV-Ogler is offline
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Location: California
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The picture is from after upsizing from a 4 to a 5.
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Old 08-10-2021, 06:58 PM
Desert Rat Desert Rat is offline
Join Date: Aug 2018
Location: Wichita KS
Posts: 666

Rule of thumb is 2d from center of the hole, or 1.5 d from the edge of the hole, but if you look at the mil spec its actually a little bit less than that.

Vans has a link to the appropriate mil-spec on their web site under the builder support tech Q&A section.

The min mil-spec edge distance for a -5 non flush rivet is .281"

It's important to understand that a mil-spec is generic approved engineering data that can typically be defaulted to in the absence of other approval, but if manufacturing prints say something else, then that would take precedence.
Terry Shortt
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Old 08-10-2021, 09:24 PM
blaplante blaplante is offline
Join Date: Jan 2010
Location: Southern California
Posts: 290
Default Another Option

Instead of going from #4 to #5 another option is CherryMax oversized rivets for a slightly messed up hole (per the link typical oversize is .01"
So a #4 would be 0.125, the Cherrymax oversize would be 0.135,
while a #5 would be 0.156"
So it would certainly lessen edge distance concerns.

Obviously you'd want Van's opinion on using the CherryMax instead of a solid rivet.
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Old 08-11-2021, 08:58 AM
RV-Ogler RV-Ogler is offline
Join Date: Aug 2021
Location: California
Posts: 13

Showed the pic to mothership, was told to build on. I do have a Vans practice control surface kit in my shop Iím gonna work on that first.
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Old 08-12-2021, 07:05 AM
JeremyL JeremyL is offline
Join Date: Aug 2020
Location: Maurertown,Virginia
Posts: 119

Yeah, looks fine, build on.

RV7A(in construction)
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Old 08-12-2021, 07:52 AM
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acam37 acam37 is offline
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Location: Lufkin Tx
Posts: 758

When in doubt, ask the people at Vans. You should see the stuff I deal with on store bought planes. You would be appalled at what quality control lets go the door. Some of the worst riveting Iíve ever seen is on Cessnas.
Arlie Conner (A&P)
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