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Martin B-10 (1934)

Role Bomber aircraft
Manufacturer Glenn L. Martin Company
Designer Peyton M. Magruder
First flight 16 February 1932
Introduction November 1934
Retired 1949 (Royal Thai Air Force)
Primary users United States Army Air Corps
Netherlands East Indies Air Force
Turkish Air Force
Produced 19331940
Number built 121 B-10
82 model 166
32 B-12348 of all variants including 182 export versions
Variants Martin Model 146
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History Martin Aircraft Company
Martin B-10 (1934)



The Martin B-10 was the first all-metal monoplane bomber to be regularly used by the United States Army Air Corps, entering service in June 1934. 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

The B-10 began a revolution in bomber design. Its all-metal monoplane airframe, along with its features of closed cockpits, rotating gun turrets (almost simultaneously with the 1933 British Boulton & Paul Overstrand biplane bomber's own enclosed nose-turret), retractable landing gear, internal bomb bay, and full engine cowlings, became the standard for bomber designs worldwide for decades.[2] It made all existing bombers completely obsolete. Martin received the 1932 Collier Trophy for designing the XB-10.

Operational history

Dutch East Indies

Dutch Martin 139 at Andir in 1937
In the mid-1930s, the Netherlands government adopted a doctrine for defense of the Netherlands East Indies which relied on the use of land-based bombers against any attacking force, with orders for defensive fighters cancelled to pay for the bomber force. The Martin 139 was chosen in preference to the Dutch Fokker T.V, as its all metal construction was considered more robust than the steel tube and fabric Fokker, while the Martin bomber was also already in production and therefore would be available sooner. Twelve Martin 139 WH-1s were ordered for the Royal Netherlands East Indies Army Air Force (ML-KNIL) in 1936, followed by 26 improved WH-2s in March 1937, sufficient bombers to equip a Group of three squadrons. In December 1937, an order was placed for 39 Martin 139 WH-3s, followed by an order for 40 Martin 139 WH-3As in November 1938. Two more Martin 139 WH-3As were ordered in July 1939 to replace aircraft lost during delivery. The last of these attrition replacement aircraft was delivered in March 1940, including the last Martin B-10/139 built. On the outbreak of war with Japan in December 1941, about 58 Martins (WH-3 and WH-3As) were operational with six squadrons, with about 20 more of the older variants in reserve. B-10s of the ML-KNIL served in the defense of the Dutch East Indies..

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Martin B-10 (1934)

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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)
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Powerplant

    • Empty weight: 9,681 lb (4,391 kg)
    • Gross weight: 14,700 lb (6,668 kg)
    • Max takeoff weight: (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
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Specifications

    • Maximum speed: 213 mph (343 km/h)
    • Cruise speed: 193 mph (311 km/h)
    • 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 
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Performance

  • Guns: 3 × 0.300 in (7.62 mm) Browning machine guns
  • Bombs: 2,260 lb (1,025 kg)
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