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  #1  
Old 01-09-2019, 10:24 PM
GeoffH GeoffH is offline
 
Join Date: May 2018
Location: Otterville, Ontario
Posts: 12
Default Replacing Skin, drilling new holes to size

Hello, I'm thinking of replacing a rudder skin. The part of the process that I'm not sure of is match drilling the new skin holes to the existing dimpled structure. Should the pre-punched skin holes be drilled to size while on the bench or should the skin be clecoed to the structure then drilled? If the holes are drilled first and then the skin installed will it properly fit the structure? However if the skin is first clecoed to the dimpled structure any misalignment is just going to cause the holes in the structure to become oversize when drilled.
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  #2  
Old 01-09-2019, 10:35 PM
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Wunderon Wunderon is offline
 
Join Date: Jun 2014
Location: Seattle (Edmonds) and Iowa
Posts: 157
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Honestly if it were me I think I’d do a whole new one. I would guess the difference in parts cost wouldn’t be too bad.
-dave
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Dave Grimmer
RV8 “final” assembly lol
Edmonds WA
paid 2018
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  #3  
Old 01-11-2019, 03:44 PM
-goose -goose is offline
 
Join Date: Mar 2005
Posts: 88
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Cleco the new skin to the old one flat on a bench and check that all the holes line up. If so, cleco the new one to the rudder, check it's all straight then match drill.
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John Keen
RV-7 complete and about to fly
Gold Coast, Australia
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  #4  
Old 01-12-2019, 06:54 AM
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RV8Squaz RV8Squaz is offline
 
Join Date: Feb 2006
Location: Senoia, Georgia
Posts: 691
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Geoff,

If the original skin was pre-punched, I’m betting you can just drill the holes in the new skin to size, debur, and dimple and it would match perfectly. I had to replace a forward side skin on my RV-8 before removing the “canoe” from the fixture and it matched up very well. That included the seemingly hundreds of holes in the landing gear box area! The reason I had to replace the skin is because I had an air hose failure that put a large outward dent on the skin.

All that said, I agree with Dave. The parts are inexpensive, especially since you will already be paying for shipping for the skin. Also, it is likely less effort to build a new rudder than it would be to drill out all of those rivets.
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