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-   -   Fuel tank ribs (https://vansairforce.net/community/showthread.php?t=96900)

Fracrat 02-26-2013 04:42 AM

Fuel tank ribs
 
I'm having a devil of a time with fitting the ribs. The bend of the skin does not seem to be enough for the rib. Having to force the skin to mate up with rib holes. As much as 3/8 in alignment difference. As always thanks for the help!

rleffler 02-26-2013 06:39 AM

Which ribs are you having difficulty with?

The tank ribs were the ones that I had the most difficulty with, but then I figured out a solution. I had started by putting clecos on one side, then having problems with the other side. I had symptoms like you described. I found if I reversed the process and started on the other side, the process went smoother. I can't explain the physics, only the results.

There are other rib "opportunities" in the build too. If you haven't read the "gotchas" section that Tim Olson put on myrv10.com, I would strongly recommend it.

bob

bill@fusion4.net 02-26-2013 06:45 AM

Start from the tip on each side
 
I found them difficult as well, but found if I clecoed starting at the tip on both sides that they aligned better. They were very tight

Fracrat 02-26-2013 06:56 AM

Thanks for the feedback will try a different technique. will also read tim olsen's site. hopefully just need a little more elbow grease. trying not to be to ruff with it.

J Twilbeck 02-26-2013 09:02 AM

I found these difficult as well. After arguing with them for longer than I would like to admit I found that if I cleco the leading edge in place on each side (a single hole on each side) and then keep alternating sides as I move aft it worked out with no problems.

ppilotmike 02-26-2013 09:53 AM

+1...
 
My fuel tank ribs were also a challenge to assemble and match drill. I fluted them as best as possible to align the holes, but they were still a royal pain, especially the holes near the rib tips.

BigD 02-26-2013 10:00 AM

Almost done with my tanks (rear baffle remains) and I agree with Twilbeck and Bill. I left the skin out of the cradle to start, then clecoed one rib at a time, bottom leading edge, then top leading edge. by having the skin out of the cradle you can open it up a little and get the clecoes started. With only two holes clecoed, they are a little bit floppy. Then get the next one or two per side in and finally put the thing in the cradle. Still required some pulling with a punch to get some of the holes lined up, but more like a 1/16th of an inch. After they are drilled and dimpled, the pro seal plus the slightly larger holes allow assembly with the skin starting in the cradle. There have been some recent posts on this as well...

==dave==
RV-10
ordering fuse

Mouser 02-27-2013 07:25 AM

I concur with what has been said above. I'm about to put the aft baffle on my final tank. Getting the initial assembly done was a real pain and I ended up with a lot of scratches on the inside of the skins near the nose of each rib. I did find after match-drilling that the second assembly was considerably easier.

longranger 02-27-2013 10:04 AM

The -7 tank ribs were no piece of cake either. After a lot of trial and error, I got the best results from starting on top at the nose, and working my way toward the spar, then put the half-clecoed tank in the cradle to compress the skin toward the bottom side, then clecoed the bottom starting at the spar and working down. The first cleco or two on the bottom need to be levered into place, but after that it gets easier. Details and photos here.

Fracrat 03-01-2013 08:00 PM

Ribs
 
Changed my technique and started at the nose out of the cradle and put first two clecoes on both sides then worked my way aft. Still a pain but worked. Thanks for all the help.

MTBehnke 03-01-2013 08:32 PM

I just finished my tanks on my -10. For the ribs, try inserting the first cleco at the aft ends from the inside, through the rib first, instead of from the outside, through the skin first. I think I might have used the second hole from the end to get a better angle to align with the hole in the skin. After you get the rest of the clecos in, then you can reverse the first cleco if you want.

paul330 03-08-2013 08:02 PM

I think everyone has trouble with these ribs. I found they needed to be much more heavily fluted than you would think necessary.

Flandy10 03-08-2013 08:58 PM



For those not familiar with this issue, the fuel tank skins have a slightly different manufactured radius than the tank ribs. With the tight prepunched tolerances, that is all it takes to make this a pain. Look closely at the rib/skin clearance starting at the big arrow on the right and working toward the smaller arrow. This is standard across all fuel tanks-QB and SB. I compared mine to several completed -10s during tank construction, and they are all the same.

Like the VS nose rib, this is one of the few quirks of the kit.

dspender 03-10-2013 01:22 AM

If I go with the QB option, do I have to deal with this?

rleffler 03-10-2013 06:35 AM

Quote:

Originally Posted by dspender (Post 751368)
If I go with the QB option, do I have to deal with this?

The quick build is fully assembled, except for the bottom skins, so that answer to your question is no.

It isn't that big of deal. The wing kit is probably the easiest of the kits to assemble. Yes, there are parts that will frustrate you a bit. But there is plenty of support available from the RV-10 community.

If you want to shorten the time for your build and budget isn't a concern, then my all means go with the quick build. I did the normal build with no prior experience and managed to complete everything just fine. If you read the "gotcha" page on Tim Olson's site, then will know about 99% of all the problem areas. With advanced knowledge of the issue and the solution, they are all easy to manage. I was overwhelmed with some of the fiberglass work at the beginning, but it was a skill that you'll quickly master. It's just very tedious and takes time to do it right.


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