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  #1  
Old 12-28-2017, 06:22 PM
amaris amaris is offline
 
Join Date: Feb 2015
Location: Santa Ynez, CA
Posts: 129
Default Tank and leading edge assembly issue

I'm back to the re-assembly on the wing, mounted the leading edge and now when I went to attach the tank back on, I can't get it lined up. The top side sits too far farward so I can't get the screw holes to line up. Of course, it all fit at one point before I prosealed.

I possibly could force it down with some straps but if I do that, will I ever be able to get it back on when I'm doing the final final assembly when I'm done?

The z-brackets are bolted down and the bottom side lines up okay.

I also have a few spots where the tank skin won't sit flush with the leading edge and it won't seat into the countersink holes. I thought it may have been some proseal not allowing it to sit flush with the splice, but I don't see any excess.

Any suggestions?

The top side screw holes not lining up...



The skin sitting high and won't go flush...

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  #2  
Old 12-28-2017, 06:40 PM
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wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 2,950
Default Proseal

Just a thought...Look at the Proseal bead on the aft edge of the baffle. Sometimes the bead if thick enough to touch the wing spar cap a d prevent the tank from mating. Usually it only effects the invoard end of the tank but if the bead is big, it could interfere on the spar itself. One of the tricks is to lay wax paper on the wing and actually mount the tank ( after a couple days) for a few days to allow the proseal to form.
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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/01/2017. Plus a little extra.
RV-7A #73391, N511RV reserved (1,800+ 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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  #3  
Old 12-28-2017, 07:32 PM
salto salto is offline
 
Join Date: Apr 2015
Location: Wee Waa Australia
Posts: 258
Default

Is it possible that you put too generous layer of proseal under the Z brackets?
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  #4  
Old 12-28-2017, 07:51 PM
amaris amaris is offline
 
Join Date: Feb 2015
Location: Santa Ynez, CA
Posts: 129
Default

Gents, thanks for the repsonse.

Larry, there's very little proseal seeping out of the baffle, so I don't think that's it.

Salto, of course that's possible, but I spread it pretty thin on those so if it were too thick, it's not in proportion to how much the alignment is out.

Still stumped!
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  #5  
Old 12-28-2017, 07:57 PM
Kyle Boatright Kyle Boatright is offline
 
Join Date: Aug 2005
Location: Atlanta, GA
Posts: 3,282
Default

Time to invoke a wooden block and a hammer. Lightly.

That was the factory recommendation 20 years ago when I had the same problem.
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  #6  
Old 12-28-2017, 08:01 PM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is online now
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 1,602
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Try using 3 or so ratchet straps around the tank. You will need wood blocks against the rear spar to keep the straps from screwing up the wing skin trailing edge.

Carl
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  #7  
Old 12-29-2017, 10:08 AM
amaris amaris is offline
 
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Location: Santa Ynez, CA
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Carl,
I was going to do that but concerned about next time I have to put the tank back on after fitting the wings to the fuse. Does it settle into the place or will I end up having to strap it again? Which becomes more concerning when everything is in place.
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  #8  
Old 12-29-2017, 11:08 AM
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wirejock wirejock is offline
 
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Location: Estes Park, CO
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Default Mating wings

Quote:
Originally Posted by amaris View Post
Carl,
I was going to do that but concerned about next time I have to put the tank back on after fitting the wings to the fuse. Does it settle into the place or will I end up having to strap it again? Which becomes more concerning when everything is in place.
I didn't pull the tanks to mate the wings. In fact, they haven't been removed since install.
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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/01/2017. Plus a little extra.
RV-7A #73391, N511RV reserved (1,800+ 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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  #9  
Old 12-29-2017, 11:09 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is online now
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
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Quote:
Originally Posted by amaris View Post
Carl,
I was going to do that but concerned about next time I have to put the tank back on after fitting the wings to the fuse. Does it settle into the place or will I end up having to strap it again? Which becomes more concerning when everything is in place.
Assuming you cleaned up any pro-seal that is hitting the spar (especially at the wing root) then once you strap it down it should set - or at least get better.

Carl

BTW - a two inch schotch brite wheel on an air grinder does a nice job cleaning up pro-seal from the rear baffle.
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  #10  
Old 12-29-2017, 11:59 AM
amaris amaris is offline
 
Join Date: Feb 2015
Location: Santa Ynez, CA
Posts: 129
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Thanks, that's great to know. I thought I read that it'll be coming apart again to do final assembly.

I'll double check the proseal and then give it some pressure with the straps.
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