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The Martin B-10 was the first all-metal monoplane bomber to be regularly used by the United States Army Air Corps, having entered service in June 1934.[1] It was also the first mass-produced bomber whose performance was superior to that of the Army's pursuit aircraft of the time.

The B-10 served as the airframe for the B-12, B-13, B-14, A-15 and O-45 designations using Pratt & Whitney engines instead of Wright Cyclones. A total of 348 of all versions were built. The largest users were the US, with 166, and the Netherlands, with 121

General characteristics

Crew: 3
Length: 44 ft 9 in (13.64 m)
Wingspan: 70 ft 6 in (21.49 m)
Height: 15 ft 5 in (4.70 m)
Wing area: 678 sq ft (63.0 m2)
Empty weight: 9,681 lb (4,391 kg)
Gross weight: 14,700 lb (6,668 kg)
Max takeoff weight: 16,400 lb (7,439 kg)
Powerplant: 2 × Wright R-1820-33 Cyclone (F-3) 9-cylinder air-cooled radial piston engines, 775 hp (578 kW) each
Propellers: 3-bladed variable-pitch propellers
Performance

Maximum speed: 213 mph (343 km/h, 185 kn)
Cruise speed: 193 mph (311 km/h, 168 kn)
Range: 1,240 mi (2,000 km, 1,080 nmi)
Service ceiling: 24,200 ft (7,400 m)
Wing loading: 21.7 lb/sq ft (106 kg/m2)
Power/mass: 0.105 hp/lb (0.173 kW/kg)
Armament
Guns: 3 × 0.300 in (7.62 mm) Browning machine guns
Bombs: 2,260 lb (1,025 kg)