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Langley’s Propeller Research Tunnel

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AngelOfThyNight:
Langley’s Propeller Research Tunnel

Chief of aerodynamics Elton W. Miller ponders the future of the Sperry M-1 Messenger, the first full-scale airplane tested in the Propeller Research Tunnel. Miller was one of the designers of the Propeller Research Tunnel.
Source: Langley’s Propeller Research Tunnel

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