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Gentlemen:
A sesquiplane means 1 and one half wings. The lower wing in most cases is thetruss wing. It is a solution to provide support and bracing of the full wing by adding an airfoil to the spar of the truss to increase the lift and reduce the drag of the spar.
Blue skies,
Dan-San
P.S. Look at the truss under an Etrich Taube wings.
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