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  #1  
Old 11-17-2021, 03:20 PM
Sieldan Sieldan is offline
 
Join Date: May 2019
Location: Tallassee, AL
Posts: 41
Default Looking for tips on tank/leading edge rib prep.

Greetings all,

In my -8 build, I have reached the point of working the leading edges and the tanks. The leading edges are done to the cleco point and its time to get to work on the tanks. My issue is this: I dont know what Im doing to get the ribs to seat nicely in their positions. The leading edges took a bit of finagling to cleco in. I just know that if I have to do that with the tanks, Im going to get leaks. So, what are your tips, suggestions, rules of thumb, whatevers on how to get the tank ribs to lay flat with out oil canning, and thus, I hope, seat into the skins easily?

Thanks yall.
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RV-8 #83842
Tallassee, AL
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  #2  
Old 11-17-2021, 04:30 PM
wirejock's Avatar
wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 4,756
Default Skin and ribs

Quote:
Originally Posted by Sieldan View Post
Greetings all,

In my -8 build, I have reached the point of working the leading edges and the tanks. The leading edges are done to the cleco point and its time to get to work on the tanks. My issue is this: I dont know what Im doing to get the ribs to seat nicely in their positions. The leading edges took a bit of finagling to cleco in. I just know that if I have to do that with the tanks, Im going to get leaks. So, what are your tips, suggestions, rules of thumb, whatevers on how to get the tank ribs to lay flat with out oil canning, and thus, I hope, seat into the skins easily?

Thanks yall.
First fit is always tough. After a few in and outs, they seem to cooperate.
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Estes Park, CO
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Donated 01/01/2021, plus a little extra.
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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 11-22-2021, 01:54 PM
Sieldan Sieldan is offline
 
Join Date: May 2019
Location: Tallassee, AL
Posts: 41
Default

Thanks Larry. Guess I just need to keep working on it.
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Tallassee, AL
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  #4  
Old 11-22-2021, 02:20 PM
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Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 3,250
Default

The trick is to flute the ribs, straighten the flanges, then flute again until they are perfectly straight. A touch on the Scotch Brite wheel on the rib tips flanges (on the inside where the flat flanges mate with the curved skin) helps as well.

Carl
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  #5  
Old 11-22-2021, 02:23 PM
Sieldan Sieldan is offline
 
Join Date: May 2019
Location: Tallassee, AL
Posts: 41
Default

Quote:
Originally Posted by Carl Froehlich View Post
The trick is to flute the ribs, straighten the flanges, then flute again until they are perfectly straight. A touch on the Scotch Brite wheel on the rib tips flanges (on the inside where the flat flanges mate with the curved skin) helps as well.

Carl
Thanks Carl.
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  #6  
Old 11-22-2021, 06:23 PM
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Wiley E Wiley E is offline
 
Join Date: Mar 2011
Location: Barnesville, Ga
Posts: 16
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I'm building extended tanks for a RV4. Nothing is pre drilled on my 4 kit. This technique noted below works to stabilize ribs while working.

I used 2inch pvc cut square and exact length between ribs. I ran a 3/16 threaded rod through PVC and rib tooling holes with nuts on each side of ribbs to stabilize leading edge of nose ribs. One end of each PVC pipe had a small notch for bead roll to allow PVC to sit flat on ribs.
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  #7  
Old 11-22-2021, 09:12 PM
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bruceh bruceh is offline
 
Join Date: Mar 2008
Location: Ramona, CA
Posts: 2,509
Default

Yes, on the tiny leading edge tabs (the ones without rivet holes), you can file or use the scotchbrite wheel to round them down so that they fit inside the skin much nicer.
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  #8  
Old 11-24-2021, 07:14 AM
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steve murray steve murray is offline
 
Join Date: Jan 2005
Location: Flat Rock, North Carolina
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Quote:
Originally Posted by Wiley E View Post
One end of each PVC pipe had a small notch for bead roll to allow PVC to sit flat on ribs.
Hi, I am also building old non_prepunched RV4, looks like a great tip. I did not understand the description of putting a notch for the "bead roll", could you clarify?

Thanks
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  #9  
Old 11-24-2021, 12:53 PM
Taltruda Taltruda is offline
 
Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 913
Default

Quote:
Originally Posted by steve murray View Post
Hi, I am also building old non_prepunched RV4, looks like a great tip. I did not understand the description of putting a notch for the "bead roll", could you clarify?

Thanks
I think he’s talking about the bead on the ribs for strength.. he notched the PVC tubing to clear that possibility?
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Last edited by Taltruda : 11-24-2021 at 12:57 PM.
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