Boeing Model 42

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 number of aircraft left over after the end of World War I.

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

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 (8.89 m)
  • Wingspan: 45 ft 0 in (13.7 m)
  • Height: 10 ft 8 in (3.25 m)
  • Wing area: 440 ft2 (40.9 m2)
  • Empty weight: 3,107 lb (1,409 kg)
  • Gross weight: 4,665 lb (2,116 kg)
  • Powerplant: 1 × Liberty L-12A, 420 hp ( kW)


  • Maximum speed: 112 mph (180 km/h)
  • Cruise speed: 110 mph (177 km/h)
  • Range: 420 miles (676 km)
  • Service ceiling: 13,050 ft (3,977 m) 


  • 4x 0.30 cal machine guns


  1. ^ a b Bowers, 1966. pg. 60.
  2. ^ Bowers, 1966. pg. 59.
  • Bowers, Peter M. Boeing aircraft since 1916. London: Putnam Aeronautical Books, 1966.
Boeing aircraft model numbers
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