Last night I had this dream about a bizarre helicopter that used a simple but unique form of a propeller. Conceptually, I see no reason why it should not work... but I'm not sure if it would be any better or more efficient than a typical propeller. The idea is that the geared propellers rotate at the tips of the main rotor as it spins. The outside ring is fixed such that as the central propeller spins, each of the out side disc spin creating lift from both the central propeller as well as each of the four outside propellers. Because the geared wheels will spin faster than the central rotor, theoretically it might produce more lift than a single propeller (maybe). I would like to hear other people's thoughts on the concept. If someone has a 3D printer, it should be relatively simple to make and test.