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10-31-2018, 07:09 AM
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Join Date: May 2018
Location: Israel
Posts: 108
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Damaged dimple on a skin, is it fatal?
Hi Guys ,
I need your educated opinion here, we damaged a
dimpled holes a bit, what do you think is it so
bad that requires a new skin?
here is what happened:
We just started to scuff the VS skin (VS-801PP)
as a preparation for priming / coating.
Accidentaly we applied too much force on the inner side where dimpled cone is.
As a result there are a few dimpled holes that are a bit larger now: (about 0.15mm) and they are a bit flatened , you can see the results on pictures attached. Also
have to add here that the front side of the holes is
completely fine.
Please advise if it may cause a problem or may affect the structure strenght.
The big question now is , whether we can continue with that skin or we have to order a new one.
Looking forward for your recommendations.
check that album for illustration:
https://imgur.com/a/Oes7Ocq
Blogging my RV14 here:
https://bit.ly/2PzjPzS
Last edited by romanov : 10-31-2018 at 07:14 AM.
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10-31-2018, 07:18 AM
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Join Date: Mar 2017
Location: Birmingham, Alabama
Posts: 1,645
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The general rule is that you can adjust a dimpled hole one time, either reversing it (if you dimpled the wrong direction) or re-dimpling. After that, the aluminum is considered fatigued and needs to be replaced.
I would try to dimple them again first, but just once. If that doesn't fix it for you the best solution is to just get another part and consider that one practice .. I had lots of "practice" 
__________________
RV-14A #140376
N196 (Flying)
2019 Bronze Lindy
Last edited by bkervaski : 10-31-2018 at 07:30 AM.
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10-31-2018, 07:29 AM
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Join Date: Aug 2005
Location: Olathe, KS
Posts: 398
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Vans is the final say, but these aren't 'reverse dimpled'. I'd say touch them up with dimple dies again and let the rivet do its job, maybe upsize one length rivet.
EDIT: The heavy mechanical scuffing method may lead to more issues and would change my recommendation.
__________________
Brad Brensing
RV-10 Emp/Tailcone - Complete, QB Wings - Building, Fuse - Building
Never judge a man by his trim tabs.
Last edited by iwannarv : 10-31-2018 at 12:39 PM.
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10-31-2018, 07:47 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,769
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Personally I would go to 1/8" rivets in these holes. You are using way too much scuffing force. Very little scuffing is needed, especially if you are using a self-etching primer.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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10-31-2018, 07:52 AM
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Join Date: May 2018
Location: Israel
Posts: 108
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Thanks guys, the mail to Vans been
sent. Your ideas are very interesting.
How often people go to 1/8 rivet
while killing 3/32 holes?
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10-31-2018, 08:44 AM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,947
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Process
Consider changing the process. Scuff before dimpling.
__________________
Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
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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10-31-2018, 09:00 AM
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Join Date: Mar 2006
Location: Newport, TN
Posts: 7,496
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How the heck did you scuff the skin hard enough to both flatten a dimple and enlarge a hole? How is this even possible? What are you using to scuff ?
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10-31-2018, 09:05 AM
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Join Date: Jan 2010
Location: Denver, CO
Posts: 1,967
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Oops Rivets..
..have the same head as an AN-3 but the shank of an AN-4. However, if this condition is over a whole lot of holes, I'd start again, since you've hardly begun.
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10-31-2018, 09:05 AM
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Join Date: Jun 2010
Location: Sunman, IN
Posts: 2,189
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...and
And remember, if you need to go up a shank size, you can use "Oops" rivets. They have the same sized hand as the specified rivet but the shank is one size larger...
__________________
Bob
Aerospace Engineer '88
RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
297 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...
Dues+ Paid 2019,...Thanks DR+
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10-31-2018, 09:09 AM
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Join Date: May 2018
Location: Israel
Posts: 108
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Quote:
Originally Posted by ppilotmike
..have the same head as an AN-3 but the shank of an AN-4. However, if this condition is over a whole lot of holes, I'd start again, since you've hardly begun.
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That one. Wont do it again.
https://imgur.com/6j97R5H

Last edited by romanov : 10-31-2018 at 09:25 AM.
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