Corrie wrote:
Peter Dohm asked, quite reasonably

What are these hinges supposed to hold???


The spar. I'm thinking about the possibility of considering the
feasibility of investigating a folding wing. The spar would have a
hinge installed top and bottom. To fold the wing you remove the
bottom pin. GW of the aircraft in mind is ~1500lb. It would need to
be able to take 6 g's, hence my concern about strength.

The sailplane may have used standard piano hinges, but it was about
500 lbs, and probably not stressed for more than 3 g's.

The Dyke Delta does this with a 1/2" pin that passes through fittings in
the top and bottom spar. Max gross is 1950lbs.

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----Because I can----
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