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  #1  
Old 03-19-2020, 02:36 PM
amaris amaris is offline
 
Join Date: Feb 2015
Location: Santa Ynez, CA
Posts: 210
Default Empennage fairing drilling??

Thanks to the incredibly detailed Van's instructions "see drawing 44 for the empennage fairing installation details", I'm wondering how I match drill the fairing attachment since I have the dark gray gel coat and can't just see through it.

Any tips, techniques?

Anyone else doing a fiberglass underside fairing? I'm fresh out of the Sportair Workshop and think I can do it!
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  #2  
Old 03-19-2020, 03:03 PM
PhatRV PhatRV is online now
 
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I think you can just drill a pilot hole, cleco and drill/cleco the next hole using the empenage skin prepunched holes as guide.
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  #3  
Old 03-19-2020, 03:06 PM
amaris amaris is offline
 
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Well yes, but I canít get in there to back drill. Seems I need the VS in place to keep things in alignment. No?
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  #4  
Old 03-19-2020, 03:37 PM
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Strap duplicator. One the few places it works well for the task.
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  #5  
Old 03-19-2020, 03:42 PM
RussellT RussellT is offline
 
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Location: Albany Western Australia
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I used a laser on a camera tripod, set it up square to the screw hole then put the fairing in place and drill the cross with a small bit. Use a needle file to enlarge the hole if you are a smidgen off. Bit fiddly in that you need to move the laser for each hole but no big deal in the scheme of things.
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  #6  
Old 03-19-2020, 04:04 PM
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bjdecker bjdecker is online now
 
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On the vertical and horizontal stab, draw two lines starting at the screw hole and extending out 1.75" to 2.5", angle should be between 30° and 45°. Now lay the empennage fairing in place, tape it down, etc. Now re-draw the two lines on the fairing, the intersection will be the location of the hole in the VS and HS.

Cheers!

B
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  #7  
Old 03-19-2020, 06:02 PM
amaris amaris is offline
 
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Thanks for the suggestions. I was surprised at how easy the hole duplicator worked. I thought for sure it would cause misalignment from being lifted, but each hole worked and then I was done!
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