Dubbed the "Rotabuggy" was a British prototype vehicle that was intended to offer a way of air-dropping off-road vehicles. Its first test flight took place in 1943 and only one was produced. Formally known as the Malcolm Rotaplane: It was essentially a Willys MB with a tail fin and rotor blade: Although initial tests showed that the Rotabuggy was prone to severe vibration, with improvements the Rotabuggy achieved a flight speed of 70 mph 1 February 1944. The last test flight occurred in September 1944, where the unit flew for 10 minutes at an altitude of 400 feet (121.9 m) and a speed of 65 mph (105 km/h), after being released by a Whitley bomber, and was described as "highly satisfactory". However, the introduction of gliders that could carry vehicles (such as the Waco Hadrian and Airspeed Horsa) made the Rotabuggy superfluous and further development was cancelled.