Standard H-2

The Standard H-2 was an early American Army reconnaissance aircraft, ordered in 1916. The H-2 was built by the Standard Aircraft Corporation, and previously known as the Sloane H-2. It was an open-cockpit three-place tractor biplane, powered by a 125 hp (90 kW) Hall-Scott A-5 engine. Only three were built.

An improved version, the H-3, with the same engine, earned an order for nine aircraft, while the Navy ordered three with floats as the H-4H.

Two Standard H-3s were sold by the US Army to Japan, where a further three were built by the Provisional Military Balloon Research Association (PMBRA) in 1917, powered by 150 hp (110 kW) Hall-Scott L-4 engines. They were used as trainers between May 1917 and March 1918, although they were considered dangerous.^[1]

Operators

 Japan

• Imperial Japanese Navy Air Service

 United States

• United States Army
• United States Navy

Specifications (H-3)

H-4H seaplane

Data from Course in Aerodynamics and Airplane Design: Part II–Section 1^[2]

General characteristics

• Crew: 2
• Length: 27 ft 0 in (8.23 m)
• Wingspan: 40 ft 1 in (12.22 m)
• Wing area: 532 sq ft (49.4 m²)
• Empty weight: 2,500 lb (1,134 kg)
• Gross weight: 3,300 lb (1,497 kg)
• Fuel capacity: 68 US gal (57 imp gal; 260 L)
• Powerplant: 1 × Hall-Scott A-5 straight-6, 135 hp (101 kW)

Performance

• Maximum speed: 84 mph (135 km/h, 73 kn)
• Stall speed: 46 mph (74 km/h, 40 kn)
• Endurance: 6 hr
• Time to altitude: 10 minutes to 3,400 ft (1,000 m)

References

Notes

1. Mikesh and Abe 1990, p. 55.
2. Klemin and Huff Aviation 15 February 1917, p. 91.

Bibliography

• Klemin, Alexander and T. H. Huff. "Course in Aerodynamics and Airplane Design: Part II–Section 1". Aviation, Volume II, No. 2, 15 February 1917, pp. 91–92. (Registration required).
• Donald, David, ed. Encyclopedia of World Aircraft, p. 854, "Standard aircraft". Etobicoke, Ontario: Prospero Books, 1997.
• Mikesh, Robert C. and Shorzoe Abe. Japanese Aircraft, 1910-1941. London: Putnam, 1990. ISBN 0-85177-840-2.