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Donald A. Hall Estate Collection

Hazy View of the Tri-Motor Engine (1925)

A close, slightly out-of-focus air-to-air view looking directly at the spinning propeller and radial engine block of a Ford Tri-Motor in flight. — Hazy View of the Tri-Motor Engine (1925) · Donald A. Hall Estate Collection

A piece of aviation history, capturing the era when corrugated metal began replacing fabric and wood in passenger transport. Photo taken when Donald A. Hall, designer of the Spirit of St. Louis in 1927, was working as a contract aerodynamics engineer.