Roton SSTO
The Roton was a single-stage-to-orbit (SSTO) concept spacecraft designed by Gary Hudson and built by Rotary Rockets Inc.The vehicle was unique in using helicopter-style rotors for landing, rather than wings or parachutes. The rotors were rocket powered.
An atmospheric test vehicle was built which successfully flew, proving the rocket-rotor concept, but shortly afterwards the venture ran out of funds and closed down.
