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

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

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


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". www.joebaugher.com. Retrieved 30 January 2019.