Just from a personal / historical POV ... Whilst at a '(Zapple?) Festival of human power' (in my Sinclair C5) at Milton Keynes many many years ago (1985?), along with human powered cycles, trikes and quads, there were human powered hydrofoils running on the lake and I think it was the 'Gossamer Albatross', a fairly early human powered aeroplane that I think made one very short hop as the conditions weren't really suitable (too windy).
The most impressive vehicle there was a fully faired tandem called (if memory serves correctly), 'Dark Horse' that was captained by an athlete and had what could have been a large ape as the stoker!
Cheers, T i m