Martin XLB-4

The Martin XLB-4 was a 1920s proposal for a light bomber by the Glenn L. Martin Company.

Role Medium bomber
Manufacturer Martin
Status Paper project only
Number built 0

Design and development

The XLB-4 would have been a biplane bomber of all metal construction, powered by two Pratt & Whitney R-1690 Hornet radial engines. The United States Army Air Corps (USAAC) ordered a single prototype serialled 27-332, but the aircraft was cancelled because the USAAC leadership was lukewarm about experimenting with all-metal aircraft.[1][2]

Specifications (XLB-4 estimated)

General characteristics

  • Crew: 5
  • Length: 44 ft 8 in (13.61 m)
  • Wingspan: 76 ft (23 m)
  • Height: 16 ft 7 in (5.06 m)
  • Wing area: 1,203.0 sq ft (111.76 m2)
  • Empty weight: 5,891 lb (2,672 kg)
  • Gross weight: 11,982 lb (5,435 kg)
  • Powerplant: 2 × Pratt & Whitney R-1690 Hornet 9-cylinder air-cooled radial piston engines, 525 hp (391 kW) each


  • Maximum speed: 69 mph (111 km/h, 60 kn)
  • Wing loading: 9.98 lb/sq ft (48.7 kg/m2)

See also

Related development

Aircraft of comparable role, configuration and era

Related lists


  1. ^ Wagner, Ray (23 March 1982). American combat planes (3d, enl. ed.). Doubleday. ISBN 9780385131209.
  2. ^ Baugher, Joe. "Martin XLB-4". Retrieved 30 January 2019.
Glenn L. Martin Company

The Glenn L. Martin Company was an American aircraft and aerospace manufacturing company founded by aviation pioneer Glenn L. Martin. The Martin Company produced many important aircraft for the defense of the US and allies, especially during World War II and the Cold War. During the 1950s and 60s, the Martin Company moved from the aircraft industry into the guided missile, space exploration, and space utilization industries.

In 1961, the Martin Company merged with American-Marietta Corporation, a large sand and gravel mining company, forming Martin Marietta Corporation. In 1995, Martin Marietta merged with aerospace giant Lockheed to form the Lockheed Martin Corporation.

List of aircraft (Ma)

This is a list of aircraft in numerical order of manufacturer followed by alphabetical order beginning with 'M'.

USAAS/USAAC/USAAF/USAF bomber designations, Army/Air Force and Tri-Service systems
Original sequences
Main sequence
Long-range Bomber
Tri-Service sequence

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