The Gossamer Condor was a bowsprit Rogallo stretched to it's limit. Plus a canard. wire bracing worked since the top speed was so low, and weight to wing area was king. Struts can reduce drag, but add weight. Wires with a kingpost can be stronger than struts, since the strut isn't as good in compression. At a certain weight, cantilever is best. Where exactly? I dunno.