Aviation Models Martin 146
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    The Martin 146 was designed for a USAAC competition, announced on August 6, 1934, to find a modern replacement for the assorted twin-engine Keystone biplane bombers. The requirement was for a multi-engine bomber, to be used mostly for coastal-defense. The Martin 146 competed against the Douglas DB-1 (B-18) and Boeing Model 299 (B-17 Flying Fortress).

    At the time, the Martin B-10 was the latest bomber in service and the US Army Air Corps was generally satisfied with the plane. However, they were now looking for a longer range aircraft with the following requirements:

Range of at least 1,020 miles (1,640 km).
Speed of 200 to 250 mph (322 to 402 km/h).
Bomb load of 2,000 lb (907 kg).2
    The Martin 146 was not much of an improvement over the Martin B-10. It had the same configuration of turrets and engines with the main difference being that the cockpit had side-by-side seating for the pilots. It was powered by two 800 hp Wright R-1820-G5 Cyclone engines. The wing span was 75 ft. 1 in. (22.9 m) and the length was 52 ft. 0 in. (15.5 m). The top speed was 234 mph (377 km/h) and had a service ceiling of 28,500 ft. (8,687 m). Armament consisted of three 0.30 caliber machine guns and could carry a bomb load of 2,260 lbs. (1,030 kg).

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August 28, 2013.