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Compression member location?

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Will Aldridge

Well-Known Member
Joined
Oct 30, 2009
Messages
997
Location
Northern Utah
I've been comparing Avid/kitfox (tube spar) wings with SuperCub wings (extruded aluminum I-beam) and have a question, hopefully I won't get roasted too bad for asking. I noticed that kitfox wings don't use compression members. My assumption is that is due to the tube spars being strong enough in multiple directions to not need them, as opposed to the I beam spars which are really only strong in bending with the rest of the wing structure making up for their other deficiencies.

The question is why is there a compression member at the root, right at the wing attach fittings? My assumption would be that the fuselage frame would be adequate to keep the spars apart at that location. Weight being the enemy, i assume there's a good reason for it to be there.

1616005140520.png

The above pic I believe is a Javron Super Cub wing kit, that inspired the question.
 
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