Piasecki VZ-8 Airgeep
| VZ-8 Airgeep | |
|---|---|
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| Role | Experimental rotorcraft |
| Manufacturer | Piasecki Aircraft |
| First flight | 15 February 1962 |
| Primary user | U.S. Army |
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.[1] The flying jeep was envisioned to be smaller and easier to fly than a helicopter.
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[edit] 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 180 hp (134 kW) 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.[2][3]
It was re-engined with a single 425 shp (317 kW) Turbomeca Artouste turboshaft replacing the two piston engines, flying in this form in June 1959.[2] 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 shp (410 kW)) Garrett AiResearch TPE331-6 engine.[4]
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.[5]
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. It could also have the power of "invisibility" because its ducts shielded the propellers so it could not be seen visually or detected on radar because it flew so low.[6] 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.[4]
[edit] Specifications (VZ-8P (B))
Data from Flying Jeeps: The US Army's Search for the Ultimate 'Vehicle' [4]
General characteristics
- Crew: 2 (Pilot and co-pilot/gunner)
- Capacity: 3 passengers
- Length: 26 ft 1 in (7.44 m)
- Main rotor diameter: 2× 8 ft 2 in (2.5 m)
- Width: 9 ft 3 in (2.81 m)
- Height: 5 ft 10 in (1.77 m)
- Empty weight: 2,611 lb (1,184 kg)
- Gross weight: 3,670 lb (1,664 kg)
- Powerplant: 2 × Turbomeca Artouste IIC turboshaft, 550 hp (298 kW) each
Performance
- Maximum speed: 85 mph (136 km/h)
- Cruise speed: 70 mph (112 km/h)
- Range: 35 miles (56 km)
- Service ceiling: 3,000 ft (914 m)
Armament
- Provision for one recoilless rifle - not fitted
[edit] See also
- Aircraft of comparable role, configuration and era
[edit] References
- Notes
- ^ The Flying Platforms & Jeeps
- ^ a b Harding 1998, p.11.
- ^ "PA-59K: History - Flying Jeeps". Piasecki Aircraft Corporation. 2009. Retrieved 26 March 2010.
- ^ a b c Harding 1998, p.12.
- ^ "PA-59H: History - Flying Jeeps". Piasecki Aircraft Corporation. 2009. Retrieved 26 March 2010.
- ^ http://www.helicoptermuseum.org/AircraftDetails.asp?HelicopterID=27
- Bibliography
- Harding, Stephen. "Flying Jeeps: The US Army's Search for the Ultimate 'Vehicle'". Air Enthusiast, No. 73, January/February 1998. Stamford, Lincs, UK:Key Publishing. ISSN 0143 5450. pp.10-12.
[edit] External links
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