Military Factory logo
Icon of F-15 Eagle military combat fighter aircraft
Icon of AK-47 assault rifle
Icon of Abrams Main Battle Tank
Icon of navy warships
Icon of a dollar sign
Icon of military officer saluting

Martin B-10

Twin-Engine Medium Bomber

Martin B-10

Twin-Engine Medium Bomber


The Martin B-10 was an advanced aircraft for its time, but made obsolete when World War 2 had arrived.
National Flag Graphic
ORIGIN: United States
YEAR: 1932
STATUS: Retired, Out-of-Service
MANUFACTURER(S): Glenn L. Martin Company - USA
OPERATORS: Argentina; China (Taiwan); Indonesia; Netherlands; Philippines; Soviet Union; Siam (Thailand); Turkey; United States

Unless otherwise noted the presented statistics below pertain to the Martin B-10B model. Common measurements, and their respective conversions, are shown when possible.
LENGTH: 44.62 feet (13.6 meters)
WIDTH: 70.54 feet (21.5 meters)
HEIGHT: 15.42 feet (4.7 meters)
WEIGHT (EMPTY): 9,700 pounds (4,400 kilograms)
WEIGHT (MTOW): 16,402 pounds (7,440 kilograms)
ENGINE: 2 x Wright R-1820 G-102 Cyclone 9-cylinder radial piston engines developing up to 1,000 horsepower.
SPEED (MAX): 214 miles-per-hour (345 kilometers-per-hour; 186 knots)
RANGE: 1,243 miles (2,000 kilometers; 1,080 nautical miles)
CEILING: 24,278 feet (7,400 meters; 4.60 miles)
RATE-OF-CLIMB: 1,380 feet-per-minute (421 meters-per-minute)

1 x 7.62mm machine gun in nose position
1 x 7.62mm machine gun in dorsal position
1 x 7.62mm machine gun in ventral position

Maximum bomb load of up to 2,260 lb of internally-held ordnance.
Graphical image of an aircraft medium machine gun
Graphical image of an aircraft conventional drop bomb munition

Series Model Variants
• Model 123 - Base Model Project Designation as pursued by Martin.
• XB-907 - US Army Evaluation Designation of Model 123.
• XB-907A - Modified US Army Evaluation Designation of Model 123.
• XB-10 - USAAC Modified Model based on the XB-907A model.
• YB-10 - Modified XB-10 models
• B-10 - Base Production Model Designation
• YB-10A - based on YB-10 model but fitted instead with Wright R-1820-31 radial piston engines.
• B-10B - Initial and Main Production Model Designation.
• B-10M - Target Tug Conversion Models of B-10B.
• RB-10
• YB-12 - Improved B-10 Model fitted with Pratt & Whitney R-1690-11 Hornet radial piston engines.
• B-12A - "Improved B-10" Production Model
• YB-13 - Proposed Re-engined Variant Model
• XB-14
• A-15 - Proposed Attack Model Variant
• YO-45 - Experimental Testing Platform
• Model 139 - Export Designation for B-10 Model
• Model 139WA - Argentina Export Model Designation for demonstration model.
• Model 139WAA - Argentina Export Model Designation; fielded with Argentine Army units.
• Model 139WAN - Argentine Export Model Designation; fielded with Argentine Naval units.
• Model 139WC - Chinese Export Model Designation.
• Model 139WH - Netherlands Export Model Designation.
• Model 139WS - Soviet Demonstrator Model
• Model 139WSM - Siam Export Model Designation
• Model 139WSP - Proposed Spanish Export Model
• Model 139WT - Turkish Export Model Designation


Detailing the development and operational history of the Martin B-10 Twin-Engine Medium Bomber.  Entry last updated on 3/18/2019. Authored by Staff Writer. Content ©
The Martin B-10 medium bomber was a breakthrough design for American military aviation when it appeared in the early 1930s. However, despite its advanced form at the time of introduction, the series was quickly made obsolete at the outbreak of hostilities concerning World War 2. The series managed to persevere during the period through its healthy stable of export customers around the globe. Before the end, over 300 examples of the type were delivered.

The B-10 originated as a private venture initiative by the Glenn Martin Company through the "Model 123" design. This work then begat the XB-907 evaluation models for the U.S. Army and featured Wright SR-120-E radials as well as open-air crew positions. These were seen in April of 1932.

The XB-907A was a revised form incorporating several requested changes. Modifications were made to the wing mainplanes to widen their reach. Engines consisted of 2 x Wright R-1820-19 series radials.

The XB-10 marked official prototype forms for the U.S. Army and brought about the use of enclosed crew positions and revised undercarriage legs. Evaluation models then became YB-10 and YB-10A, the latter shifting from R-1820-25 radials to R-1820-31 turbo-supercharged radials. Fourteen YB-10s were produced to the single YB-10A that was completed.

Once in production (as the "B-10") and reaching operational service status in June of 1934, the B-10 became the first quantitative American bomber design of all-metal construction and the first anywhere in the world to outpace pursuit fighters of the period. It was also the first local design to feature turreted armament for defense against intercepting enemy fighters. For the United States, the B-10 became a breakthrough design that helped to lay down doctrine, practices, and lessons for future bomber needs still to come.

Martin B-10 (Cont'd)

Twin-Engine Medium Bomber

Martin B-10 (Cont'd)

Twin-Engine Medium Bomber

At its core, the Martin B-10 was a twin-engine, medium-class bomber powered by a pair of Wright R-1820 G-102 "Cyclone" 9-cylinder radial piston engines. The engines were fitted on what would become the USAAC's first attempt at a cantilever low-wing monoplane. The fuselage housed a crew of four that included the pilot and machine gunners. The nose and tail were both glazed over and held defensive armament in the form of machine guns. The aircraft three machine guns in all. A aft section of the fuselage was also glazed over (greenhouse-style) for another crew position and a ventral machine gun was carried near here. All machine guns were of 7.62mm caliber. Internally, the aircraft was cleared to carry upwards of 2,260 pounds of conventional drop ordnance.

After the early B-10 production forms came about, the B-10B (Model 139) followed as primary production versions. These carried R-1820-33 series engines of 775 horsepower (each) and 105 were built to this standard. The B-10M served as a target tug or mail carrier and RB-10MA was a special, modified version of July 1942 flown from Australia to the United States.

YB-12 (Model 139B) arrived as a marginally improved B-10 evaluation model. Over-water safety was improved through installed flotation chambers and Wright engines were given up in favor of 2 x Pratt & Whitney R-1690-11
"Hornet" radials of 775 horsepower (each) instead. Seven of these were produced for April 1940.

B-12A became the first production forms of the YB-12 test models but only 25 units followed to this standard. YB-13 saw PW R-1860-17 "Hornet B" radials of 700 horsepower (each) installed but, despite ten being ordered, none were completed. XB-14 tested PW YR-1830-9 "Twin Wasp" engines of 900 horsepower (each) but only a single YB-12 was converted (and then reverted) for testing. A-15 became a proposed USAAC attack variant but official selection went to the A-14 "Shrike" design offered by competitor Curtiss.

Even while the USAAC began its shift to more modern bomber platforms, export orders (as the "Model 139W") allowed the B-10 lines to remain active for the time being. Customers included the Netherlands with an order of 120, Argentina with 35, and Thailand and Turkey having ordered 26 and 20 respectively.

Aviation engineer Glenn Martin won the prestigious Collier Trophy in 1932 for his design work on the Martin B-10.


Our Data Modules allow for quick visual reference when comparing a single entry against contemporary designs. Areas covered include general ratings, speed assessments, and relative ranges based on distances between major cities.

Image of collection of graph types

Relative Maximum Speed
Hi: 300mph
Lo: 150mph
This entry's maximum listed speed (214mph).

Graph average of 225 miles-per-hour.
City-to-City Ranges
Graph showcases the Martin B-10B's operational range (on internal fuel) when compared to distances between major cities.
Aviation Era
Pie graph section
Pie graph section
Pie graph section
Pie graph section
Pie graph section
Useful in showcasing the era cross-over of particular aircraft/aerospace designs.
Unit Production (348)
Comm. Market HI*: 44,000 units
Military Market HI**: 36,183 units

  * Commercial Market High belongs to Cessna 172.

  ** Military Market High belongs to Ilyushin Il-2.

Altitude Visualization
Small airplane graphic
Supported Roles
Ground Attack
Aerial Tanker
A2A=Air-to-Air; UAV=Unmanned; CAS=Close Support; ASW=Anti-Submarine; AEW=Airborne Early Warning; MEDEVAC=Medical Evac; EW=Electronic Warfare; SAR=Search-Rescue
Commitments / Honors
Military lapel ribbon for Operation Allied Force
Military lapel ribbon for the Arab-Israeli War
Military lapel ribbon for the Battle of Britain
Military lapel ribbon for the Battle of Midway
Military lapel ribbon for the Berlin Airlift
Military lapel ribbon for the Chaco War
Military lapel ribbon for the Cold War
Military lapel ribbon for the Cuban Missile Crisis
Military lapel ribbon for pioneering aircraft
Military lapel ribbon for the Falklands War
Military lapel ribbon for the French-Indochina War
Military lapel ribbon for the Golden Age of Flight
Military lapel ribbon for the 1991 Gulf War
Military lapel ribbon for the Indo-Pak Wars
Military lapel ribbon for the Iran-Iraq War
Military lapel ribbon for the Korean War
Military lapel ribbon for the 1982 Lebanon War
Military lapel ribbon for the Malayan Emergency
Military lapel ribbon representing modern aircraft
Military lapel ribbon for the attack on Pearl Harbor
Military lapel ribbon for the Six Day War
Military lapel ribbon for the Soviet-Afghan War
Military lapel ribbon for the Spanish Civil War
Military lapel ribbon for the Suez Crisis
Military lapel ribbon for the Vietnam War
Military lapel ribbon for Warsaw Pact of the Cold War-era
Military lapel ribbon for the WASP (WW2)
Military lapel ribbon for the World War 1
Military lapel ribbon for the World War 2
Military lapel ribbon for the Yom Kippur War
Military lapel ribbon for experimental x-plane aircraft
* Ribbons not necessarily indicative of actual historical campaign ribbons. Ribbons are clickable to their respective campaigns/operations.

Site Disclaimer  |  Privacy Policy  |  Cookies  |  Site Map Site content ©2003-, All Rights Reserved.

The "Military Factory" name and logo are registered ® U.S. trademarks protected by all applicable domestic and international intellectual property laws. All written content, illustrations, and photography are unique to this website (unless where indicated) and not for reuse/reproduction in any form. Material presented throughout this website is for historical and entertainment value only and should not to be construed as usable for hardware restoration, maintenance, or general operation. We do not sell any of the items showcased on this site. Please direct all other inquiries to militaryfactory AT

Part of a network of sites that includes GlobalFirepower, a data-driven property used in ranking the top military powers of the world.

Facebook Logo YouTube Logo