Editing Martin B-10 (section)

==Variants==
[[File:Martin XB-907 in flight.jpg|thumb|Martin XB-907]]
[[File:Martin YB-10.jpg|thumb|Martin YB-10]]
[[File:Martin B-12 parked.jpg|thumb|Martin B-12]]
[[File:Martin B-12A.jpg|thumb|Martin B-12A]]
[[File:Martin XB-14.jpg|thumb|Martin XB-14]]

=== Martin Model 123 ===
Private venture of Martin company, predecessor of the XB-10, served as prototype for the series, one built.<ref name="fitz45">Fitzsimons 1967/1969, p. 1845.</ref>
;XB-907
:US Army designation for the Model 123 in evaluation,<ref name="fitz45"/> with open cockpits and two Wright SR-1820-E, delivered April 1932.
;XB-907A
:Modified XB-907 after Martin returned it to U.S. Army for further operational trials,<ref name="fitz46"/> with larger wingspan and two Wright R-1820-19.
;XB-10
:Designation of the prototype when purchased by the United States Army Air Corps, Modified XB-907A with enclosed cockpits and turret and single strut landing gear.<ref name="world1"/><ref>[http://www.10af.afrc.af.mil/shared/media/photodb/photos/060511-F-1234S-003.jpg "Photo of XB-10."] {{webarchive|url=https://web.archive.org/web/20110722180510/http://www.10af.afrc.af.mil/shared/media/photodb/photos/060511-F-1234S-003.jpg|date=2011-06-22}} ''10af.afrc.af.mil.'' Retrieved: 17 July 2011.</ref>

=== Martin Model 139, 139A and 139B ===
Army Air Corps versions, 165 built.
;YB-10
:Model 139A, test and production version of the XB-10 with crew reduced to three members, and two {{cvt|675|hp|kW}} R-1820-25, 14 built, some flown temporarily as float planes.<ref name="world2"/>
;YB-10A
:The '''YB-10A''' was different from a YB-10 only in its engines. It used [[Wright R-1820]]-31 turbo-supercharged radials, allowing it to attain speeds of {{cvt|236|mph|kph}}. This made it the fastest aircraft of the B-10 series. Despite this advantage, only one was built, as a test aircraft.<ref name="world2"/>
;B-10
:According to one source, two additional aircraft ordered in 1936.<ref name="world2"/>
;B-10B
:Model 139, main production version with two {{cvt|775|hp|kW}} R-1820-33 engines, 105 built, delivered August 1936.<ref name="world2"/>
;B-10M
:According to one source this was, these were B-10Bs converted as target tugs.<ref name="world2"/> According to Martin's own archive, this was the designation of the YB-10 after testing, then used for airmail and Alaska missions, 13 of the 14 built were still in service in April 1940.
;RB-10MA
:One former NEIAF Model 139WH-3A model impressed in July 1942 and flown from Australia to the United States.<ref name="world2"/>
;YB-12
:Model 139B. With {{convert|250|or|500|USgal|L}} flotation chambers for safety on overwater flights, and two [[Pratt & Whitney R-1690]]-11 "Hornet" radial engines. These {{cvt|775|hp|kW}} engines gave similar performance to those on the B-10B ({{cvt|218|mph|kph}}), seven built, five still in service in April 1940.<ref name="world2"/>
;(Y)B-12A
:The production version of the YB-12 with provision for a {{cvt|365|USgal|L}} fuel tank in the bomb bay, giving the B-12A a combat range of {{cvt|1240|mi|km}}, 25 built, 23 still in service in April 1940.<ref name="world2"/>
;YB-13
:Re-engined version of the YB-10 powered by two {{cvt|700|hp|kW}} [[Pratt & Whitney R-1860|Pratt & Whitney R-1860-17 Hornet B]] radial engines. Ten were on order but cancelled before production started, not built.<ref name="world2"/>
;XB-14
:To test the new {{cvt|900|hp|kW}} [[Pratt & Whitney R-1830|Pratt & Whitney YR-1830-9]] "Twin Wasp" radial engines, one built which was converted back to YB-12 after testing.<ref name="world2"/>
;A-15
:Proposed attack variant of the YB-10 with two {{cvt|750|hp|kW}} R-1820-25 engines, was never built. The contract fell to the [[A-14 Shrike]].<ref name="ohnine2">Swanborough and Bowers 1964, p. 332.</ref>
;YO-45
:With two {{cvt|750|hp|kW}} Wright R-1820-17, proposed high-speed observation role, one B-10 was beginning to be converted in 1934 and another in 1935 but both were stopped before being completed and were converted back into B-10s.

=== Model 139W and 166 ===
The export versions, 100 built (182 including the Model 166, see below).
;Model 139WA
:Martin demonstrator for Argentina, later sold to Argentine Navy.
;Model 139WAA
:Export version for Argentine Army, 22 built, delivered April 1938.
;Model 139WAN
:Export version for the Argentine Navy, 12 built, delivered November 1937.
;Model 139WC and WC-2
:Export version for China, six and three built, delivered in February and August 1937.<ref name="jackson"/><ref name="Baugher">Baugher, Joe. [http://www.joebaugher.com/usaf_bombers/b10.html "Martin B-10".] ''American Military Aircraft'', 11 July 1999. Retrieved: 13 June 2010.</ref>
;Model 139WH
:Export version for the Netherlands, used in the Netherlands East Indies. Thirteen WH-1s, powered by {{convert|770|hp|kW|abbr=on}} Cyclone GR-1820-F53 engines delivered from December 1936, followed by 26 WH-2s, with {{convert|875|hp|kW|abbr=on}} GR-1820-G3 engines, delivered 1938.<ref name="Casius p23,6">Casius 1983, pp. 2–3, 6.</ref>
;Model 139WR
:Single demonstrator to the Soviet Union.<ref name="world2"/><ref name="Baugher"/>
;Model 139WSM and WSM-2
:Export version for Siam, three and three built, delivered in March and April 1937.<ref name="world2"/>  Locally designated B.Th.3 ({{langx|th|บ.ท.๓}}).<ref>{{Cite web |title=Thai Military Aircraft Designations |url=https://designation-systems.net/non-us/thailand.html |access-date=2025-03-18 |website=designation-systems.net}}</ref>
;Model 139WSP
:Proposed license built version to be built by CASA of Spain, production blocked by U.S. State Department.
;Model 139WT
:Export version for Turkey, 20 built, delivered September 1937.<ref name="jackson"/>
 
[[File:Dutch Martin Model 166.jpg|thumb|Side view of Dutch Martin Model 166]]
;Model 166
Final version, a.k.a. 139WH-3 and 139WH-3A, 82 built.
:Export version for the Netherlands, used in the Netherlands East Indies. Redesigned wings, nose and single 'glass house' canopy, bomb shackles between engines and fuselage, and better engines. The WH-3 had two {{cvt|900|hp|kW}} R-1820-G5 (40 built, delivered September 1938), the WH-3A had two {{cvt|1000|hp|kW}} R-1820-G-105A (42 built, delivered March 1940). With the bomb shackles, the bomb load could be doubled for a shorter range. A total of 121 of all types were built for the Dutch.<ref name="world2"/>