World Library  
Flag as Inappropriate
Email this Article

Boeing Y1B-20

Boeing Y1B-20
Role Heavy bomber
Manufacturer Boeing
First flight n/a
Status Cancelled
Primary user United States Army Air Forces
Number built 0
Developed from Boeing XB-15

The Boeing Y1B-20 (Boeing 316) was designed as an improvement on the Boeing XB-15 (Y1- indicates a funding source outside normal fiscal year procurement.) It was slightly larger than its predecessor, and was intended to use much more powerful engines. It was presented to the Army in early 1938, and two orders were placed soon after. The order was reversed before construction began.

Despite their cancellation, the XB-15 and Y1B-20 laid the groundwork for the Boeing B-29 Superfortress.[1]


  • Specifications (as designed) 1
  • See also 2
  • References 3
  • External links 4

Specifications (as designed)

General characteristics


  • Guns:
    • 3× .30 in (7.62 mm) machine guns
    • 4× .50 in (12.7 mm) machine guns
  • Bombs: 17,600 lb (6,620 kg)

See also

Related development
Aircraft of comparable role, configuration and era
Related lists


  1. ^ Kohn, Leo. "Boeing XB-15 Super Flying Fortress: U.S. Heavy Bomber". In Ray Merriam. U. S. Warplanes of World War II. World War II Journal 69. Merriam Press. pp. 43–44.  

External links

  • Encyclopedia of American Aircraft
  • USAF Museum description of Y1B-20
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.