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- Air Mail Service Boeing 40 Airplane Heading East over the Rocky Mountains, 1928 - Passenger accommodations were sparse on a Boeing 40, but the airplane primarily was designed to carry mail. Early in its production, the airplane's original water-cooled Liberty V-12 engine was replaced with an air-cooled Pratt & Whitney radial engine. The air-cooled motor eliminated the need -- and excess weight -- of a radiator and water, increasing the airplane's payload and profitability.
- 1928
- Collections - Artifact
Air Mail Service Boeing 40 Airplane Heading East over the Rocky Mountains, 1928
Passenger accommodations were sparse on a Boeing 40, but the airplane primarily was designed to carry mail. Early in its production, the airplane's original water-cooled Liberty V-12 engine was replaced with an air-cooled Pratt & Whitney radial engine. The air-cooled motor eliminated the need -- and excess weight -- of a radiator and water, increasing the airplane's payload and profitability.