H-2
Standard H-3
Role	Trainer Type of aircraft
National origin	United States
Manufacturer	Standard Aircraft Corporation

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)

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)