Boeing 42

Model 42
Role observation
National origin United States
Manufacturer Boeing
First flight 6 February 1925[1]
Number built 3
Developed from Airco DH-4M-1

The Boeing Model 42 (also Boeing XCO-7 for Experimental Corps Observation Model 7) was an American biplane aircraft developed from the Airco DH.4, taking advantage of the large amount of aircraft left over after the end of World War I.

Development and design

The Model 42 was essentially an Airco DH-4M-1 fitted with new Boeing tailplanes, tapered wings, and tripod landing gear. The first aircraft built, designated XCO-7, was used as a static test bed, and did not fly. The second aircraft, XCO-7A, used a standard DH-4M-1 fuselage and Liberty engine, with the Boeing modifications. The final aircraft, XCO-7B, added balanced elevators and inverted the Liberty engine. Both flyable aircraft were shipped to McCook Field, where the first flight occurred on 6 February 1925.[1]

The performance of the new aircraft did not justify the cost of the conversion, and Boeing abandoned the project.[2]

Specifications (XCO-7A)

Data from Bowers, 1966. pg. 60.

General characteristics
  • Crew: 2
  • Length: 29 ft 2 in ( m)
  • Wingspan: 45 ft in ( m)
  • Height: 10 ft 8 in ( m)
  • Wing area: 440 ft2 ( m2)
  • Empty weight: 3,107 lb ( kg)
  • Gross weight: 4,665 lb ( kg)
  • Powerplant: 1 × Liberty L-12A, 420 hp ( kW)


  • Maximum speed: 112 mph ( km/h)
  • Cruise speed: 110 mph ( km/h)
  • Range: 420 miles ( km)
  • Service ceiling: 13,050 ft ( m)
  • 4x 0.30 cal machine guns
  • References

    • Bowers, Peter M. Boeing aircraft since 1916. London: Putnam Aeronautical Books, 1966.
    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.