An investigation of a wing-propeller configuration employing large-chord plain flaps and large-diameter propellers for low-speed flight and vertical take-off Page: 2 of 95
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TECH LIBRARY KAFB, NM
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS III'iIIII
006b304
TECHNICAL NOTE 33070066304
AN INVESTIGATION OF A WING-PROPELI R CONFIGURATION
EMPLOYING LARGE-CHORD PLAIN FLAPS AND
LARGE-DIAMETER PROPELERS FOR
LOW-SPEED FLIGHT AND
VERTICAL TAKE-OFF
By Richard E. Kuhn and John W. Draper
SUMMARY
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 ver-
tical take-off and low-speed flight has been conducted in the Langley
300 MPH 7- by 10-foot tunnel. The semispan model used was equipped with
a 60-percent-chord flap, a 30-percent-chord flap, and two large-diameter
overlapping propellers.
Under static-thrust conditions, a maximum upward rotation of the
effective thrust vector of 450 was obtained with the 60-percent-chord
flap deflected 300 and the 30-percent-chord flap deflected 500. With
the addition of two auxiliary vanes, the upward deflection of the thrust
vector was increased to 670. With this configuration, vertical take-off
could be made with a take-off attitude of 230 and at airplane weights up
to 95 percent of the thrust. A method is presented for calculating the
lift due to flap deflection and slipstream for small flap deflections
if the lift due to flap deflection at zero thrust and the lift due to
flap deflection at zero forward speed are known.
INTRODUCTION
The practical utilization of the helicopter has indicated the use-
fulness of aircraft that are capable of operating from very small bases.
The advantages to be gained with aircraft that incorporate the small-
field capabilities of the helicopter and the high-speed potential of
conventional airplanes are readily apparent. Numerous designs have been
proposed for achieving these advantages. If lift is to be produced, it
is necessary to give a mass of air per unit time a downward velocity.
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Kuhn, Richard E. & Draper, John W. An investigation of a wing-propeller configuration employing large-chord plain flaps and large-diameter propellers for low-speed flight and vertical take-off, report, December 1954; (https://digital.library.unt.edu/ark:/67531/metadc57315/m1/2/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.