Rotary Rocket Roton
The Rotary Rocket Roton concept that Bevin McKinney came up with combined a helicopter with a launch vehicle. The design was slightly revised with a rotating annular aerospike engine when manufacturing it. The Roton is cone-shaped with a folded rotary wing on top for a safe landing. It is 63 ft (19 m) in height. In 1999, the aircraft had three successful flights. Unfortunately, a fourth flight was scheduled but did not occur due to the company closing in 2000, which relied entirely on private financing.