Pic 1 is the top and lower wing of a biplane called Bloop Ultralight,what is the function of the cross bracing between the interplane struts as seen in pic 1(I'm not talking about landing and flying wire)?
Is it there to resist wing twist? If yes, why is it not in between the interplane struts closer to the wing tip since wing twist and torsion is greatest at the wing tip?....as seen in pic 2