Matt Whiting writes:

Strut-braced high wing is more weight efficient for the same strength,
however. Withstanding the bending moments in a cantilever wing requires
a pretty massive spar and/or thick skins in the center 1/3 or so of
the wing.

What materials are used for the spar in GA planes? I seem to recall
that large jets use titanium for the most critical structural
elements, but I presume that's too expensive for small planes (?).

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