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      Martin B 10 
      
       
      
      The 
      B-10, the first of the "modern-day" all-metal monoplane bombers to be 
      produced in quantity, featured such innovations as internal bomb storage, 
      retractable landing gear, a rotating gun turret, and enclosed cockpits. It 
      was so advanced in design that it was 50% faster than its contemporary 
      biplane bombers and as fast as most of the fighters. When the Air Corps 
      ordered 121 B-10s in the 1933-1936 period, it was the largest procurement 
      of bomber aircraft since WW I. It also ordered 32 B-10 type bombers with 
      Pratt and Whitney rather than Wright engines and designated these B-12s.
       
      
      General Henry H. "Hap" 
      Arnold once called the B-10 the air power wonder of its day. In 1934, he 
      led ten B-10s on a 8,290 mile flight from Washington, D.C. to Fairbanks, 
      Alaska and back. Although Air Corps B-10s and B-12s were replaced by B-17s 
      and B-18s in the late 1930s, China and the Netherlands flew export 
      versions in combat against Japan. 
      
        
      specifications  
      Span: 70 ft. 6 in.  
      Length: 44 ft. 9 in.  
      Height: 15 ft. 5 in.  
      Weight: 14,700 lbs. loaded  
      Armament: Three .30-cal. machine guns, 2,200 lbs. of bombs  
      Engine: Two Wright R-1820's of 775 hp. each  
      Cost: $55,000  
      performance  
      Maximum speed: 215 mph.  
      Cruising speed: 183 mph.  
      Range: 1,370 miles  
      
      Service Ceiling: 
      24,000 ft. 
  
                
            
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