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06-24-2013, 08:20 PM
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Join Date: Feb 2013
Location: Seattle, WA
Posts: 81
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Yes...the dreaded missed dimple.
I'm finishing up the last few holes on the right side horizontal stablizer using the DRDT-2 dimpler. I guess when I was giving it a good push, it jumped the hole and made a new hole. ****!.
____, __________,_____________,_________ <---insert string of favorite cuss words there.
We all know that holding the folded skin, lining up the hole, and giving it a good push with the lever is awkward when we get up close to the folded half. And there it goes....
So the common question. Is a double hole like this (not an easier figure "8") something that can be worked around or is this a new skin?
This hole is in the middle of the stablizer.
I'm thinking it's time to contact Van's....unless someone has a good idea for this common problem?
Thanks,
Tom
Learning from mistakes.
 
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06-25-2013, 12:50 AM
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Join Date: Jun 2011
Location: DFW Area, TX
Posts: 229
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I did the same thing---twice! Once for each elevator.
The first time the holes were far enough apart that I could put in 2 rivets. I did contact Van's and they confirmed I could do that as long as the edge distance is enough. But remember you have to drill and dimple 2 holes in the stiffener too. Sometimes there is not enough room to do that if the hole is too close to the bend in the stiffener angle.
The second one looked like yours, too close together for 2 rivets. I bought a new skin and started over. I did not contact Van's on that one, just didn't see any other way.
Just my opinion, I am not an expert.
__________________
Bob B
RV-7A Sold
RV-4 Sold
DFW TX
Dues Paid
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06-25-2013, 12:57 AM
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Join Date: Feb 2013
Location: Seattle, WA
Posts: 81
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Thanks Bob. I have heard about the "oops" rivet method, but this is right over the forward spar and like you side, no room to put another rivet in there.
I have seen some ideas that other builders suggest to just keep going and fill it later when painting. Epoxy, bondo or something like that. I'm just not sure what is best. I'll share the photo with Van's and ask the advice from the experts.
So close to being done...about 10 holes left then, oops!
Tom
Renton, WA
http://www.mykitlog.com/tomtraci/
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06-25-2013, 05:32 AM
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Join Date: Dec 2005
Posts: 976
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Hi Tom
Bottom line to me is that hole(s) has no integral strength as a fastener - it will crack between the 2 holes, if it has not already. However, provided the holes are cleaned up, I doubt it would go much further?
So strength wise you either assess (bravely) the fastener can effectively be omitted, or you substitute with additional rivets each side of it.
Cosmetically it can probably get filled and lost in paint, albeit then the missing / extra rivets will always remind you of the issue on every walkround
The complete opposite view is to play safe, and also "punish" yourself for rushing things, order a new skin and put it in the past. That is why you start with the empennage - make mistakes on the cheap / easy to replace stuff, and don't repeat them on the bigger stuff (e.g. wing skins).
I suspect you will go for the latter, and in the long term, you would not regret it...
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06-25-2013, 05:46 AM
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Join Date: Jul 2009
Location: England
Posts: 470
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Very often during the build you may need some scrap material to make something out of - Now you have some scrap material .. :-)
__________________
Jan
Slooow RV6, no hole, builder in UK
Paid up for 2015 ...
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06-25-2013, 06:03 AM
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Join Date: Feb 2010
Location: Gardnerville Nv.
Posts: 2,828
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Hum, must be a design flaw, I have one of those on my elevator also...
__________________
7A Slider, EFII Angle 360, CS, SJ.
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06-25-2013, 06:39 AM
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Join Date: Feb 2005
Location: Blacksburg, VA
Posts: 149
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You are not alone!
Reminds me so much of a mistake I made on my empennage....I posted a question here as well.
http://www.vansairforce.com/communit...ad.php?t=18188
Enjoyed going back and re-reading all the encouraging replies. And holy **** that was in 2007- I had way too many years of downtime on my project (resumed in earnest about 3 months ago).
You are certainly not alone in making this mistake.
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06-25-2013, 06:56 AM
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Join Date: Oct 2008
Location: Utah
Posts: 8,151
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Here is the fix for you Tom a double headed rivet. They are hard to get and very expensive. It happens I have one left

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06-25-2013, 08:33 AM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,947
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missed dimple
It must be a sickness. My HS has one too.
I went with a recommendation from a local builder/engineer and confirmed by the EAA Tech Advisor. Abandon the error and add two rivet holes equally spaced either side keeping edge spacing in mind. Once it's painted the only sign will be oddly spaced rivets in one place.
__________________
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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06-25-2013, 09:42 AM
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Join Date: Jan 2010
Location: Denver, CO
Posts: 1,967
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DRDT2 dimple tip..
Tom,
When you are dimpling holes that are close to the fold of the sheet metal, flip your dimple dies over, so that the male side is in the top and then flip the sheet metal over so the fold goes "under" your bench and the DRDT2. this will allow you to dimple all the way to the last hole and not have to pry open your nicely folded sheet. It will also remove the tension you talked about. This is important for 2 reasons: 1) keeps the work from jumping and 2) gives a nice round dimple instead of a potentially oblong one caused by the tension... Hope this helps. There's no reason you should have any figure eights with a DRDT2!  Then again, as folks have said, it's fairly commonplace. KPTR my friend...
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