Passengers and Pilot with the Boeing Model 40B Transport

Unloading a Model 40A Mailplane

Boeing Model 40C at Gorst's Field

Model 40A on Ground

40A Mail Plane

Model 40A Flight Line

Model 40B with Passengers

William Boeing with a Model 40

Model 40B-4 Mailplane Radio Ship Model

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Boeing Model 40 with Special Passenger

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The first Model 40 was built for a 1925 U.S. Post Office competition as a replacement for the converted military de Havillands that had carried the airmail since 1918. The Model 40 used steel tubing for the nose and curved wood-veneer laminate for the middle of the fuselage. The wings were wood and fabric. The plane was hampered by the antiquated water-cooled Liberty engine, required by the government in order to use up large stocks of surplus war equipment.

BI231019 (hs3618)

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2402px × 1542px (~10 MB)
8.0in × 5.1in (300dpi)

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