An investigation of a wing-propeller configuration employing large-chord plain flaps and large-diameter propellers for low-speed flight and vertical take-off

Richard E. Kuhn, John W. Draper
naca-tn-3307
Dec 1954


An investigation of the effectiveness of a wing equipped with large-chord plain flaps and auxiliary vanes in rotating the thrust vector of two large-diameter propellers through the large angles required for vertical take-off and low-speed flight has been conducted in the Langley 300 MPH 7- by 10-foot tunnel.

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http://naca.central.cranfield.ac.uk/reports/1954/naca-tn-3307.pdf