Piasecki VZ-8 Airgeep

The Piasecki VZ-8 Airgeep (company designation PA-59) was a prototype vertical takeoff and landing (VTOL) aircraft developed by Piasecki Helicopter. The Airgeep was developed to fulfill a US Army Transportation Research Command contract for a flying jeep in 1957. The flying jeep was envisioned to be smaller and easier to fly than a helicopter.

Design and development
To meet the US Army's requirement, Piasecki's design featured two tandem, three-blade ducted rotors, with the crew of two seated between the two rotors. Power was by two 425 hp Lycoming O-360-A2A piston engines, driving the rotors by a central gearbox. The first of two aircraft ordered by the Army, initially designated the Model 59K Skycar (and later renamed Airgeep) by Piasecki, and designated VZ-8P by the Army flew on 22 September 1958.

It was re-engined with a single 425 hp Turboméca Artouste IIB turboshaft replacing the two piston engines, flying in this form in June 1959. After being loaned to the US Navy for evaluation as the Model 59N where it was fitted with floats, it was returned to the Army and its engine replaced by a lighter and more powerful 550 hp Garrett AiResearch TPE331-6 engine.

The second prototype was completed to a modified design, designated Model 59H AirGeep II by Piasecki and VZ-8P (B) It was powered by two Artouste engines, with ejection seats for the pilot and co-pilot/gunner and a further three seats for passengers. It was also fitted with a powered tricycle undercarriage to increase mobility on land.

The AirGeep IIs first flight occurred on 15 February 1962 piloted by "Tommy" Atkins.

While the Airgeep would normally operate close to the ground, it was capable of flying to several thousand feet, proving to be stable in flight. Flying low allowed it to evade detection by radar. Despite these qualities, and its superiority over the other two types evaluated by the US Army to meet the same requirement (the Chrysler VZ-6 and the Curtiss-Wright VZ-7), the Army decided that the "Flying Jeep concept [was] unsuitable for the modern battlefield", and concentrated on the development of conventional helicopters.

Variants

 * Model 59K Skycar: Company designation for the first aircraft powered by two 180 hp) Lycoming O-360-A2A piston engines, given the military designation VZ-8P Airgeep. Later the piston engines were replaced by a single 425 hp) Turboméca Artouste IIB turboshaft engine.
 * Model 59N SeaGeep I: The first aircraft, (after the piston engines were replaced by a single Artouste), whilst on loan to the US Navy, fitted with floats.
 * PA-59H AirGeep II: The second aircraft, military designation VZ-8P (B), completed with two 400 hp) Turboméca Artouste IIC turboshaft engines and seats for up to five, including the crew.
 * VZ-8P Airgeep I: The military designation of the first aircraft as delivered
 * VZ-8P-1 Airgeep I:The first aircraft after the piston engines were replaced by a single 425 hp Turboméca Artouste IIB.
 * VZ-8P-2 Airgeep I: The first aircraft after the Artouste engine was replaced by a lighter and more powerful 550 hp) Garrett AiResearch TPE331-6 engine.
 * VZ-8P (B) Airgeep II:The military designation of the second aircraft.