Doak VZ-4
Role	VTOL research convertiplane
Manufacturer	Doak Aircraft Company
First flight	25 February 1958[1]
Status	preserved at Fort Eustis VA
Primary user	United States Army
Number built	1

The Doak VZ-4 (or Doak Model 16) was an American prototype VTOL aircraft built in the 1950s for service in the United States Army.

[edit] Development

The aircraft was originally powered by an 840 shp (630 kW) Lycoming YT53 turboprop engine. It was replaced with a 1,000 shp (750 kW) Lycoming T53-L-1 turbine. ^[2] The turbine engine is mounted in the fuselage driving two tilting ducted fan propellers.

Only one aircraft was produced. Given serial number 56-9642, it is on display at the U.S. Army Transportation Museum located at Fort Eustis, VA.

[edit] Operators

 United States

• NASA
• United States Army

[edit] Specifications

The Doak VZ-4 on display at Fort Eustis, Virginia, in April 2004

Data from The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985), 1985, Orbis Publishing, Page 1454

General characteristics

• Crew: 2
• Length: 32 ft 0 in (9.75 m)
• Wingspan: 25 ft 6 in (7.77 m)
• Height: 10 ft 0 in (3.05 m)
• Wing area: 96 ft² (8.92 m²)
• Empty weight: 2,300 lb (1043 kg)
• Gross weight: 3,200 lb (1451 kg)
• Powerplant: 1 × Avco Lycoming YT-53 turboshaft, 840 hp (626 kW)

Performance

• Maximum speed: 230 mph (370 km/h)
• Range: 230 miles (270 km)
• Service ceiling: 6000 ft (1830 m)

Related lists

• List of military aircraft of the United States
  

[edit] References

• The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985), 1985, Orbis Publishing, Page 1454
• United States Military Aircraft since 1909, F.G. Swanborough, 1963, Putnam & Co. Ltd, no isbn, Page 584

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