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Determination of the Influence of Propeller Thrust on C L and C D of an Airplane Using a Triple-Slotted Flap at Various Deflections
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English
Abstract
The influence of propeller slipstream on lift and drag of deflected trailing edge flaps was previously described by this author in SAE paper 960C, as applied to the Breguet 941 STOL. The method calculating transition velocities proved to be very accurate. Recently the Ames Research Center conducted tests of a four propeller model, a close replica of the Breguet, applying the same method and obtaining very accurate results. This paper gives detailed analysis of how the method can determine CL and CD under transition conditions. Designers of STOL aircraft where thrust approaches large values compared with gross weight will find the procedure useful.
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Authors
Citation
Fowler, H., "Determination of the Influence of Propeller Thrust on CL and CD of an Airplane Using a Triple-Slotted Flap at Various Deflections," SAE Technical Paper 690724, 1969, https://doi.org/10.4271/690724.Also In
References
- Quigley Innis Holzhauser “A Flight Investigation of the Performance, Handling Qualities, and Operational Characteristics of a Deflected Slipstream STOL Transport Airplane (Breguet 941) Having Four Interconnected Propellers.” NASA TN D-2231 March 1964
- Quigley Innis Holzhauser “Flight Test Data Supplement to NASA TN D-2231.” Ames Research Center Librarian at Moffett Field Calif
- Fowler Harlan D. “Determination of Breguet 941 STOL Aircraft Transition Velocities with Various Flap Deflections.” Paper 960C, presented at SAE Automotive Engineering Congress Detroit January 1965
- Page Deckert Dickinson “Large Scale Wind-Tunnel Tests of a Deflected Slipstream STOL Model Having a Wing of Aspect Ratio 5.7 and Four Propellers.” Ames Research Center Working Paper 223 November 1966
- Page Dickinson “Large Scale Wind-Tunnel Tests of a Large Deflected Slipstream STOL Model with Wings of Various Aspect Ratios.” NASA TN D-4448 March 1968
- Quigley Innis “Handling Qualities and Operational Problems of a Large Four Propeller STOL Transport Airplane (Lockheed NC-130B).” NASA TN D-1647 January 1963
- Winston Huston “Propeller Slipstream Effects as Determined from Wing Pressure Distribution on a Large-Scale Six-Propeller VTOL Model at Static Thrust.” NASA TN D-1509 December 1962
- Nishimura Y. “An Experimental Investigation by Force and Surface Pressure Measurements of a Wing Immersed in a Propeller Slipstream, Part I.” National Research Council of Canada AR-LR-501 March 1968