I think the main issue limiting flight time is that the propulsion system uses pedaling to unwind a cord around the main shaft. When the cord is fully unwound, more pedaling does nothing. I think they do this because its lighter than using a gear transfer system.
If you are trying to win a challenge, it makes sense to optimize your solution for it. And fundamentally, it's just never going to be possible to make a human powered helicopter that is compact and can run for a whole. Hovering just requires too many RPM.
If you are trying to win a challenge, it makes sense to optimize your solution for it. And fundamentally, it's just never going to be possible to make a human powered helicopter that is compact and can run for a whole. Hovering just requires too many RPM.