A flying contraption used by American astronauts as part of their training in how to control the Apollo Lunar Module (LM) during descents to the surface of the Moon. It had a weight distribution and throttle reaction time similar to that of the real LM and a downward-facing turbofan engine to provide vertical thrust. The LLRV was based around the early VTOL "Flying Bedsteads" developed to study the potential of vertical takeoff and landing for jet aircraft. Neil Armstrong had a narrow escape when the LLRV he was flying went out of control and he was forced to eject.