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The Martin B-10 all metal monoplane twin engine bomber of 1932 was a revolutionary military bomber design, quickly replacing tube and fabric open cockpit bombers of the era. It had the first multiple gun turrets-two-nose, dorsal and ventral tunnel guns, retractable landing gear, internal bomb carriage, streamlined all metal construction, multiple engines, larger wingspan, enclosed cockpits and max speed over 210 mph with 1,240 mile range! This eclipsed any biplane bombers and even exceeded in speed ANY contemporary world military fighters!
Here are the answers.
1. Glenn L. Martin Company. Design was privately funded.
2a. B-10. 2b. "Flying Whale". 2c. 342 were built. 2D. 153 for US Army Air Corps, 189 B-10 variants for export. BONUS-This was a "first" -building more of a military aircraft for export than for the US Army Air Corps.
3. Most B-10s were built with two Wright R-1820-33 Cyclone radials, but 32 were built with two Pratt & Whitney radials as B-12s.
4. First flight was on Feb. 16, 1932. Remarkable as design was conceived in same year 1932.
5. The Martin B-10 was the first aircraft to test the famous Norden bomb-sight.
The Martin B-10 design concepts directly led to the famous Boeing B-17 Flying Fortress in the late 1930s but was eclipsed by the B-17 before World War II. The B-10 had a crew of four-one pilot, one radio operator, two gunners with three .30 caliber machine guns-nose turret, ventral tunnel and rear dorsal turret.
The Martin bomber also served with Argentina, China, Netherlands, Philippines, Thailand, and Turkey. Last continuous use was by Thailand finally retired in 1949! The B-10 won the Collier Trophy in 1932 with presentation by US President Franklin Delano Roosevelt.
I thank all who pondered this quiz.