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Lightening Holes in a Built-Up I-Beam Spar?

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Chris In Marshfield

Chris In Marshfield

Well-Known Member
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Joined
Jan 29, 2008
Messages
1,704
Location
Northwest WI USA
If a wooden wing spar is a built-up I-beam type, is it okay to add lightening holes provided there are spacer bars between them to help distribute the shear loads (I hope I'm using the correct terminology)? All the built-up spars I've ever seen tend to be solid with holes only passing through where needed.
 
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