Martin B-10 - Variants

Variants

Martin Model 123

Private venture of Martin company, predecessor of the XB-10, served as prototype for the series.

XB-907

US Army designation for the Model 123 in evaluation

XB-907A

Modified XB-907 after Martin returned it to U.S. Army for further operational trials

XB-10

Designation of the XB-907A when purchased by the United States Army Air Corps, Modified Martin Model 123 with full engine cowlings, fully rotating nose glass turret, more powerful engines, and increased wingspan.

YB-10

Model 139, production version of the XB-10 with crew reduced to three members, canopies for all crew members and better engines (675 hp/503 kW R-1820-25), 14 built, some flown temporarily as float planes.

B-10

Two additional aircraft ordered in 1936.

RB-10MA

One former NEIAF Model 139WH-3A model impressed in July 1942 and flown from Australia to the United States.

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 236 mph (380 km/h). This made it the fastest aircraft of the B-10 series. Despite this advantage, only one was built, as a test aircraft.

B-10B

Main production version with two 775 hp (578 kW) R-1820-33 engines, 103 built.

B-10M

A number of B-10Bs converted as target tugs.

YB-12

Re-engined version of the YB-10 with Pratt & Whitney R-1690-11 "Hornet" radial engines. These 775 hp (578 kW) engines gave similar performance to those on the B-10B (218 mph/351 km/h), seven built.

B-12A

The production version of the YB-12 with provision for a 365 gal (1,381 l) bomb bay tank, giving the B-12A a combat range of 1,240 mi (1,995 km), 25 built.

YB-13

Re-engined version of the YB-10 powered by two 700 hp (522 kW) Pratt & Whitney R-1860-17 radial engines. Ten were on order but cancelled before production started, not built.

XB-14

The last of the 48 XB-10–airframes ordered by the army was a version of the YB-10 using Pratt & Whitney YR-1830-9 "Twin Wasp" radial engines, one built.

A-15

Proposed attack variant of the YB-10 with two 750 hp (559 kW) R-1820-25 engines, was never built. The contract fell to the A-14 Shrike.

YO-45

One YB-10 temporarily tested in the high-speed observation role.

Martin Model 139

Martin export version of the B-10 bomber, six sold to Siam

Model 139WA

Martin demonstrator for Argentina

Model 139WAA

Export version for Argentine Army, 26 built

Model 139WAN

Export version for the Argentine Navy, 12 built.

Model 139WC

Export version for China, six built.

Model 139WH

Export version to Netherlands for use in the Dutch East Indies. Produced in block series H-1 (13 built), H-2 (26 built) and H-3. The 139WH-3 (also known as the Model 166) had two 900 hp (671 kW) R-1820-G102 and single long dorsal canopy, 39 built. The 139W-3A (also known as the Model 166A) as WH-3 with equipment changes, 39 built. A total of 116 were built for the Dutch.

Model 139WS

Single demonstrator to the Soviet Union.

Model 139WSM

Export version for Siam, 6 built.

Model 139WSP

Proposed licence built version to be built by CASA of Spain, production blocked by U.S. State Department.

Model 139WT

Export version for Turkey, 20 built