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Old 12-12-2010, 04:02 PM
Pbr47906 Pbr47906 is offline
Join Date: Sep 2008
Location: West Lafayette IN
Posts: 103


It worked great. Frank Smidler stopped by while I was fabricating the doubler and helped me with the fit. I will upload a picture of the result soon. (I use photobucket to upload pictures, I think Frank uses picasa so he might be able to help you with your uploads)

Remember, the step doubler calls out AN470 rivets, so those holes won't need dimpling.


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Old 12-12-2010, 07:39 PM
Karl.Kruger's Avatar
Karl.Kruger Karl.Kruger is offline
Join Date: Oct 2010
Location: Helena Montana
Posts: 20

True story on the AN470 rivets, I think the step actually picks up new holes between the existing AN426 rivets, I will have to check again. My patch has a couple of new holes that I drilled on the curved area because of how I designed the repair. I'm glad you are headed down the road past this problem.
Karl Kruger
RV-7A N915JB
______ | ______
....... o/ \o

"You can have 5000 hours in fast jets and still
kill yourself in a Cessna trying to impress your Grandma."

Last edited by Karl.Kruger : 12-12-2010 at 07:47 PM.
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Old 12-13-2010, 08:23 AM
doug_rv7 doug_rv7 is offline
Join Date: May 2005
Location: Lincoln, NE
Posts: 65
Default Conical Bend solution from Van's

One of mine turned out perfect, the other developed a little crack. I notified Van's and Joe B. offered the solution below. I stopped drilled it but haven't created a doubler yet. I moved on.

"Try stop drilling the hole with a #30 bit and then fabricating a doubler patch, and riveting it to the inside of the skin. That should beef it up and keep it from cracking further."

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Old 06-08-2018, 04:17 PM
Ottoman Ottoman is offline
Join Date: Sep 2016
Location: Burnsville, MN
Posts: 6

It was nice to find this thread on how to bend the conical. I posted on the 5th of this month asking if there was a thread like this and it was closed the next day!?

I read all the postings and then went out to the garage and applied/blended a couples techniques. Both bends turned out very good with NO cracks! Very Pleased!

One thing I will add is that the angle iron has to be on the inside of the bend. I almost messed up the second one, the bend will start at the hole line, I was watching for it and caught it in time!

John A
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