Airships are really neat, and so is going places under human energy (like bikes!). Combining two neat things can equal something awesome – a human powered airship!
Setting the bar pretty high for airship design is this one from Christopher Ottersbach: Called the Aeolus Airship (named after Aeolus, the Greek wind god) it is designed to be aerodynamic than conventional airship designs, and stay aloft for up to two weeks on a supply of helium and, furthermore, is pedal-powered by the crew of 2-4 people. Thatâ€™s about all the tech detail Iâ€™ve come across; itâ€™s certainly made the rounds in the past couple of days but no specific website or contact info seems forthcoming. Christopher, Iâ€™d love to talk to you if you come across this.