> Cool folding prop (but scary - if it doesn't unfold properly, it could make quite a mess). Hard to tell from the video alone, but the rotor look just like my

> Cool folding prop (but scary - if it doesn't unfold properly, it could make quite a mess). Hard to tell from the video alone, but the rotor look just like my RC helicopter's: blades attached to the hub by one gudgeon pin each. If that's the case, centrifugal force alone is enough to align them perfectly †; no solenoid nor manual action needed ever. If that's the case, there's virtually no way those could fail, except for total disintegration. Pretty standard construction for small, two-bladed helis. Way cooler is that they can get away without flybar -- perhaps autogyros don't ever need one? † there's some forward-backward play of the blade as it changes attack angle and relative airspeed during rotation, but that's another matter.