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  #1  
Old 01-04-2018, 03:07 PM
DaleB's Avatar
DaleB DaleB is offline
 
Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 1,832
Default Wheel pant repair -- how many layers?

We recently discovered a chunk missing from the rear of the wheel opening in our nose wheel pant, and a couple of trailing cracks. My guess would be a chunk of gravel or something dragged through by the tire. Anyway, I think I can clean up the cracks, epoxy them and can put a couple layers of glass over them. For the missing chunk, how many layers of cloth should I plan on? I have:
  • West Systems epoxy
  • Flox
  • Micro
  • Peel ply (Dacron fabric)
  • ACS #7520 E-glass cloth, 8.5 oz.
  • Some light weight cloth, probably 3 oz. E-glass from Spruce
I wouldn't say I've never worked with glass before, but my previous experience is probably meaningless. I would think the proper way would be to sand/grind a taper on the edges so that when I lay down the new cloth it makes a scarf joint, with an inch or two of overlap. I'm thinking the heavier 8.5 oz. cloth for everything. Am I on the right track?
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Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
-=VAF=- 2017 dues paid
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  #2  
Old 01-04-2018, 04:22 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 4,236
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Quote:
Originally Posted by DaleB View Post
We recently discovered a chunk missing from the rear of the wheel opening in our nose wheel pant, and a couple of trailing cracks. My guess would be a chunk of gravel or something dragged through by the tire. Anyway, I think I can clean up the cracks, epoxy them and can put a couple layers of glass over them. For the missing chunk, how many layers of cloth should I plan on? I have:
  • West Systems epoxy
  • Flox
  • Micro
  • Peel ply (Dacron fabric)
  • ACS #7520 E-glass cloth, 8.5 oz.
  • Some light weight cloth, probably 3 oz. E-glass from Spruce
I wouldn't say I've never worked with glass before, but my previous experience is probably meaningless. I would think the proper way would be to sand/grind a taper on the edges so that when I lay down the new cloth it makes a scarf joint, with an inch or two of overlap. I'm thinking the heavier 8.5 oz. cloth for everything. Am I on the right track?
If you follow DanH's suggestions for repair, the number of layers will be what is needed to execute the repair. You can use .011" per layer for #7520 to estimate the number to restore the original thickness. Various methods can provide a "backing" to lay the patch over after the edges are tapered. Do you already have extra layers around the perimeter of the tire opening? Restore that last.
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  #3  
Old 01-04-2018, 04:23 PM
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DanH DanH is offline
 
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Quote:
Originally Posted by DaleB View Post
I would think the proper way would be to sand/grind a taper on the edges so that when I lay down the new cloth it makes a scarf joint, with an inch or two of overlap. I'm thinking the heavier 8.5 oz. cloth for everything. Am I on the right track?
Yep, scarf it. Four plies is about right, or just count the existing plies when you cut the scarf.
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  #4  
Old 01-04-2018, 06:00 PM
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DaleB DaleB is offline
 
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Location: Omaha, NE (KMLE)
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Thanks, guys. No, there are no extra layers anywhere... pants were done per plans by the builder. I figure by the time I'm done there will be an extra layer or two all around, at least on the back half of the pant. I don't want to get too carried away.
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Dale
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
-=VAF=- 2017 dues paid
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  #5  
Old 01-04-2018, 06:02 PM
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Mike S Mike S is offline
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This might help??

http://www.vansairforce.com/communit...ghlight=repair
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Flying as of 12/4/2010

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  #6  
Old 01-04-2018, 10:46 PM
fabricflyer fabricflyer is offline
 
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Location: Tylertown, MS
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Look in Kitplanes mag January 2018 page 36.
Allen
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  #7  
Old 01-05-2018, 09:29 AM
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ColoCardinal ColoCardinal is offline
 
Join Date: May 2010
Location: Morrison, CO
Posts: 270
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No intention of hijacking the thread but I think this may be pertinent.

In light of the possible cause of this damage, what pant/tire clearance is the community using and are you happy with that figure?

And something that may be considered when building or rebuilding one of the wheel pants: My Cardinal wheel pants have a (16ga?). removable and adjustable steel strip at the aft end of its wheel pants, behind the tire. They refer to it as a scraper. It is curved to match the approximate curve of the tire and it must be removed to provide adequate clearance if the tire is to be removed. The service manual calls out a 1/4" to 3/8" clearance adjustment when replacing the scraper.

I considered adding this to the RV but have more than enough work just trying to get it completed. Maybe later?
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  #8  
Old 01-05-2018, 09:32 AM
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DaleB DaleB is offline
 
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Quote:
Originally Posted by fabricflyer View Post
Look in Kitplanes mag January 2018 page 36.
Allen
Ha!! Perfect, thanks for pointing that out. That's exactly what I am doing, plus a couple of 6" long cracks that will be easy to fix. I found the 11/17 and 2/18 issues laying around here, but just read the article from the January issue on line. It must have gotten buried under a pile here and I missed reading it.

As a side note, Kitplanes has been far and away the best magazine I've subscribed to in years. I wish I'd done it sooner.
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Dale
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
-=VAF=- 2017 dues paid
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  #9  
Old 01-05-2018, 09:38 AM
Ralph Inkster Ralph Inkster is offline
 
Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 350
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Caution to not add too many extra layers to this area & make it too strong. It's near inevitable that this area will be damaged again in the future... you don't want a small damage patch to turn into a gaping rip!
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