Hi All - not sure where (if anywhere) this should go…Perhaps a new topic “the Importance of Being Darrieus”?? but this seemed as good a place as any. I must I do approve of the software position - but only as far as it applies to keeping things as tensile and/or inflatable as possible - though that may simply down to my limited computer skills. Anyway…here are couple of videos. Just to elucidate, the windspeed was (according to the Met Office) around 14 mph, and I’d estimate the flying angle (from horizontal) at a little under 45 deg. There’s no generator - it’s just happily spinning. (The parafoil was, as you may notice, not feeling quite as happy - must reinforce the central divider!) - haven’t a clue as to how much power the vertical blades are contributing - as opposed to the considerably smaller horizontal ones - but I’d be surprised if they were just there for the ride. What one should try to imagine is this as one of the central cells of a much longer Darrieus-like construction running along the tether - I’m thinking that as well as doing away with the cosine effect, this might also help to deal with the torque transfer problem, as the blades would taper down to the hub at the bottom.