Editing Martin B-10 (section)

==Design and development==
[[File:25th_Bombardment_Squadron_B-10s.jpg|thumb|Martin B-10, [[25th Bombardment Squadron]], Panama Canal Zone]]
[[File:Martin B-10 Variant.jpg|thumb|Martin B-10 during exercises over Oahu, Hawaii, 1941]]

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.<ref name="world1"/> It made all existing bombers completely obsolete. Martin received the 1932 [[Collier Trophy]] for designing the XB-10.<ref>''Collier Trophy Is Presented to Martin'', 1 June 1933.</ref>

The B-10 began as the '''Martin Model 123''', a private venture by the [[Glenn L. Martin Company]] of [[Baltimore, Maryland]]. It had a crew of four: [[Aviator|pilot]], copilot, nose [[Air gunner|gunner]] and fuselage gunner. As in previous bombers, the four crew compartments were open, but it had a number of design innovations as well.<ref name="Flying Fish">[https://books.google.com/books?id=aygDAAAAMBAJ&pg=PA51 "Flying Fish–Our Army's Newest Plane Hits Terrific Speeds (photo of Model 123, US Army designation XB-907, in flight)."] ''Popular Science,'' October 1932. Retrieved: 22 December 2010.</ref><ref name="M=List">[http://aerofiles.com/_martin.html "M-list."] ''Aerofiles.'' Retrieved: 22 December 2010.</ref>

These innovations included a deep belly for an internal [[bomb bay]] and [[Landing gear|retractable main landing gear]]. Its {{convert|600|hp|kW|abbr=on}} [[Wright R-1820|Wright SR-1820-E]] Cyclone engines provided sufficient power. The Model 123 first flew on 16 February 1932 and was delivered for testing to the [[U.S. Army]] on 20 March as the XB-907. After testing it was sent back to Martin for redesigning and was rebuilt as the '''XB-10'''.<ref name="Flying Fish"/><ref name="M=List"/>

The XB-10 delivered to the Army had major differences from the original aircraft. Where the Model 123 had [[Townend ring]]s, the XB-10 had full [[NACA cowling]]s to decrease [[Aerodynamic drag|drag]].<ref name="fitz46">Fitzsimons 1969, p. 1846.</ref> It also sported a pair of {{convert|675|hp|kW|abbr=on}} [[Wright R-1820]]-19 engines, and an {{convert|8|ft|m}} increase in the wingspan, along with an enclosed nose turret. When the XB-10 flew during trials in June, it recorded a speed of {{convert|197|mph|kph|abbr=on}} at {{convert|6000|ft|m|0|abbr=on}}. This was an impressive performance for 1932.<ref name="world1"/>

Following the success of the XB-10, a number of changes were made, including reduction to a three-man crew and addition of [[canopy (aircraft)|canopies]] for all crew positions. The Army ordered 48 of these on 17 January 1933. The first 14 aircraft were designated '''YB-10''' and delivered to [[Wright Field]], starting in November 1933, and used in the [[Air Mail scandal|Army Air Corps Mail Operation]]. The production model of the XB-10, the YB-10, was very similar to its prototype.{{citation needed|date=July 2016}}