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Sperry M-1 Messenger, the first full-scale airplane tested in the Propeller Research Tunnel.

The NACA: A Look Back

In mid-1927, a Langley Laboratory researcher ponders the future of the Sperry M-1 Messenger, the first full-scale airplane tested in the Propeller Research Tunnel. Standing in the exit cone is Elton W. Miller, Max M. Munk's successor as chief of aerodynamics.

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