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Old 02-16-2017, 10:32 PM
Roy25101 Roy25101 is offline
Join Date: Mar 2014
Location: Orlando, FL
Posts: 46
Default VS Spar, Countersink or Dimple?

I assume the answer is in the details but it is not readily apparent. Should the holes on the forward and aft VS spars be dimpled or countersunk? These are the holes the skin will attach to. The metal sure seems thin to countersink but It seems like that many dimples is going to change the shape of the spars. Thanks in advance..
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Old 02-16-2017, 10:51 PM
tgmillso tgmillso is online now
Join Date: Nov 2012
Location: Launceston, Tasmania, Australia
Posts: 653

I am building a -7 but the VS is the same. These spars should be dimpled. So long as you don't over dimple, you will not stretch the material and induce any bows. Only countersink 0.040" or thicker material, infact many times 0.040" can also be dimpled, but any thicker and the material will distort.
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Old 02-17-2017, 08:36 AM
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johnbright johnbright is offline
Join Date: Aug 2010
Location: Newport News, Va
Posts: 194
Default Countersink or dimple

Here are a couple pages from the construction manual circa 1997... I circled some paragraphs on pages 5-2 and 5-6 having to do with dimpling.
John Bright, RV-6A 25088, at FWF
O-360, 8.5:1, vert sump, SDSEFI EM-5
Z-14 adapted for EFI, wiring and IP CAD files here
Newport News, Va
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