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  • Martin MB-1 / Glenn Martin Bomber Reconnaissance / Bomber Biplane Aircraft

    Only nine Martin MB-1 series bombers were completed before the end of hostilities in World War 1.

     Updated: 4/3/2017; Authored By Staff Writer; Content ¬©www.MilitaryFactory.com

    The Martin MB-1 (also known as the "Glenn Martin Bomber") became the first American-designed heavy bomber type to be purchased in quantity in the First World War, becoming the mainstay of the United States Army Air Service (USAAS) for a time. The system was a two-engine bomber of indigenous creation (previous US bombers were simply license production derivatives of European origin) and was designed by the Glenn Martin Company. In the end, only nine full-operational systems would become available by war's end but the type would soldier on until being replaced in 1920 by the more capable Martin MB-2 series.

    Power was derived from two Liberty 12-A engines mounted between the upper and lower wing assemblies. Each engine developed a reported 400 horsepower and straddled the fuselage where three to four crewmembers were called upon to man the various open-cockpit stations. Armament was defensive and was made up of no fewer than 5 x 7.62mm machine guns in various positions about the fuselage including the bow nose mount. Offensive firepower consisted of up to 2,000lbs of ordnance. The undercarriage was of a fixed type and consisted of four wheels. First production examples were received in October of 1918.

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    Martin MB-1 / Glenn Martin Bomber Technical Specifications

    Service Year: 1918
    Type: Reconnaissance / Bomber Biplane Aircraft
    National Origin: United States
    Manufacturer(s): Glenn Martin Company (Martin) - USA
    Production Total: 22

    Structural (Crew Space, Dimensions and Weights)

    Operating Crew: 3 or 4
    Length: 44.09 feet (13.44 meters)
    Width: 71.49 feet (21.79 meters)
    Height: 14.70 feet (4.48 meters)

    Weight (MTOW): 10,223 lb (4,637 kg)

    Installed Power and Standard Day Performance

    Engine(s): 2 x Liberty 12-A engines developing 400 horsepower each.

    Maximum Speed: 104 mph (168 kph; 91 knots)
    Maximum Range: 390 miles (627 km)
    Service Ceiling: 12,247 feet (3,733 meters; 2.32 miles)

    Armament / Mission Payload

    2 x 7.62mm Lewis machien guns in bow position
    2 x 7.62mm Lewis machine guns in upper rear fuselage.
    1 x 7.62mm Lewis machine gun in lower rear fuselage.

    Up to 2,000lb of ordnance

    Global Operators / Customers

    United States

    Model Variants (Including Prototypes)

    MB-1 - Martin Company Designation / Military Designation.

    GMB "Glen Martin Bomber" - United States Army Air Service designation for MB-1 series.

    GMT "Glenn Martin Transcontinental" - Fitted with fuel tanks for increased range.

    GMC "Glen Martin Canon" - Fitted with 1 x 37mm cannon replacing bow-mounted 7.62mm machine gun.

    GMP "Glenn Martin Passenger" - Accommodations for up to 10 passengers; redesignated to T-1.

    MBT "Martin Bombers - Torpedo" - Torpedo Bomber Variant; used by the United States Navy.

    MT "Martin Torpedo" - Used by the United States Navy; based on MB-1 system with wing assembly of MB-2 bombers; redesignated to TM-1.

    T-1 - GMP Redesignation

    TM-1 - MT Redesignation

    MB-1 / NBS-1 - "Improved" MB-1 Model Series