The Martin Model 139 was a twin-engined mid-wing monoplane bomber developed from the experimental Model 123 of 1932. During 1934 48 Model 139 were delivered to the USAAC. Fifteen were fitted with 503kW Wright R-1820 Cyclone engines as YB-10 and 33 with 577.5kW Pratt & Whitney R-1690 Hornet engines as YB-12 and B-12A, a number of which were later converted into twin-float seaplanes for coastal patrol duties.
Development of the Model 139 led to numerous improvements being made, including the installation of 551.4kW SGR- 1820-G3 Cyclone engines, a Sperry automatic pilot and the addition of wing flaps, constant-speed propellers, de-icers and numerous structural and maintenance refinements. During 1935 and 1936 103 of the improved aircraft (B-10B) were delivered to the USAAC.
On 1 July 1936 the bomber was released for export and was subsequently ordered by six foreign governments, the Netherlands East Indies alone receiving 120 Model 139W and Model 166 with 670.7kW Cyclone engines. The latter aircraft introduced improved aerodynamics and performance characteristics and featured a continuous cockpit enclosure instead of the previous separate enclosures.
| ENGINE||2 x Wright R-1820-33 Cyclone|
| Take-off weight||7439 kg||16400 lb|
| Empty weight||4391 kg||9681 lb|
| Wingspan||21.49 m||71 ft 6 in|
| Length||13.64 m||45 ft 9 in|
| Height||4.70 m||15 ft 5 in|
| Wing area||62.99 m2||678.02 sq ft|
| Max. speed||343 km/h||213 mph|
| Ceiling||7375 m||24200 ft|
| Range w/max.fuel||2000 km||1243 miles|
| ARMAMENT||3 x 7.62mm machine-guns, 1000kg of bombs|
|A three-view drawing (752 x 901)|
Today the B-10 is generally thought of as a rather quaint-looking airplane that, by the time World War II began, was clearly out of date. However, it should be remembered that, at the time it first flew in 1932, the B-10 was extremely advanced, in fact far ahead of it's time. It was the first U.S. Army Air Corps bomber to include such advanced features as all-metal construction, monoplane wings, enclosed crew positions, retractable landing gear and controllable-pitch propellers. At the time the B-10 was introduced into A.A.C. service most airplanes were still biplanes with open cockpits and fixed landing gear.
The B-10 was considered so advanced that the manufacturer sold many for use by foreign air forces. Later in the 1930s, when the Soviet Tupelev SB-2 bombers began to appear in the skies above Spain and China, they were often misidentified as a "Martin Bombers" because they were mistakenly believed to have been a Soviet copy of the B-10.
Perhaps the most impressive sight about age 12 (circa 1940) was a MARTIN B-10 ON IT'S BELLY (Ramp) AT GREENVILLE, SC MUNICIPAL AIRPORT.He likely made a bell landing or his gear retracted on the ramp. Otherwise little damage was noted. Anyone know of this
Does anyone out there know what emblem unit a B-10/12 had that depicts the fuselage of a "Douglas OA-3 with large upswept bird like wings/Big/Little Dipper star formation and aerial bomb falling below aircraft on a round background with half globe on lower portion ??????
If so please contact me, I have seen photo of this emblem on aircraft wan to get "possitive" ID as to the unit , thank you !!!!!!!!!!!!!
|Mario Edgardo, 17.02.2011|
El martin que apareced en la foto esta en el Museo de dayton y fue donado por la argentina en 1974 y restaurado en USA en la Argentina estubo en la Escuela Jorge Newbery.Donde yo Estudie y desame y arme ese Avion , en el Aņo 1980 estube en presencia en ese Museo.
|Robert Williams, 03.01.2011|
I have a photograph of the B-10B taken by my father at an air show in either Bell Fourche or Spearfish SD in the mid-late 30s.
|Col L. J. Partridge Usaf Ret, 27.08.2010|
I was in Flying Cadet Class 41-F and took my advanced twin-engine training at Barksdale Field.As Cadets we flew both the B-10 and B-12. As far as I know they were no longer being used by any tactical units. I remained at Barksdale Field as an instructor and late in 1941 wwe flew all that remained to Eglin Field to be used as tow target aircraft.
|don wilson, 07.02.2010|
The first militarhy airplane I ever saw and touched. At Ft Riley, KS in 1939 it had just arrived non-stop from San Antonio, TX and the engines were still warm. The crew chief answered all my questions and at that minute I decided a career in the air was for me. And it happened.
|gene bach, 20.12.2009|
I remember one of these aircraft that flew over my house sometime in the late 30"s home was in kirkwood mo, which is about 12 miles south of lambert field in st.louis county missouri.
Do you have any comments about this aircraft ?