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Spars in a box

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cluttonfred

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A few years ago in the Bending-beam spar carry through schemes thread, Himat said “Make the overlap vertical and the spar stubs can go into a box that carry most of the load with all the surface of the spar caps to transfer the load. The pins/bolts then only lock the parts in place.”

To me, that sounds like a very interesting way to reduce the load concentrations that would be very suitable for a simple wood-and-fabric design. Does anyone know of an example of a cantilever wing (in any material, though I like wood) in which the spars fit in a box structure in the fuselage as Himat described?
 
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