Human-powered helicopters, thought-controlled helicopters, and now helicopter-bicycles! From PopSci:
The helicopter-bike is a prototype developed by a team of three Czech companies, which just took it for a five-minute test flight inside a Prague exhibition hall. That’s actually a lightweight dummy in the driver’s seat, since those massive propellers make this thing weigh over 200 pounds, meaning it’s not yet flyable with the weight of a human on board.
What kind of helicopter do you want to invent?