The Effect of Trailing-edge Extension Flaps on Propeller Characteristics PDF Download
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Author: John L. Crigler
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 32
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Book Description
Summary: An analysis was made to determine the effect on propeller performance of extension flaps added to the trailing edge of a propeller blade. A method of calculating the changes in the ideal angle of attack, the angle of zero lift, and the design lift coefficient of a propeller blade section having a trailing-edge extension flap was utilized to calculate the performance of a six-blade dual-rotating propeller with extension flaps varying up to 40 percent chord. The method was used to determine the angle that the flap extension must make with the chord in order to obtain a particular load distribution. Although the analysis in this report was made for a wind-tunnel propeller designed to operate at low advance-diameter ration, the method is directly applicable to any propeller section under any operating condition.
Author: John L. Crigler
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 32
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Book Description
Summary: An analysis was made to determine the effect on propeller performance of extension flaps added to the trailing edge of a propeller blade. A method of calculating the changes in the ideal angle of attack, the angle of zero lift, and the design lift coefficient of a propeller blade section having a trailing-edge extension flap was utilized to calculate the performance of a six-blade dual-rotating propeller with extension flaps varying up to 40 percent chord. The method was used to determine the angle that the flap extension must make with the chord in order to obtain a particular load distribution. Although the analysis in this report was made for a wind-tunnel propeller designed to operate at low advance-diameter ration, the method is directly applicable to any propeller section under any operating condition.
Author: Julian D. Maynard
Publisher:
ISBN:
Category :
Languages : en
Pages : 92
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Author: Theodore Theodorsen
Publisher:
ISBN:
Category : Charts, diagrams, etc
Languages : en
Pages : 17
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Book Description
A method is presented to evaluate changes in airfoil characteristics resulting from extension of chord at trailing edge of propeller blade section. Method determines changes in angle of zero lift, angle of attack, and difference in these angles (upon which design lift coefficient depends) as function of angle and length of trailing edge extension. Treatment is based on thin-airfoil theory and is concerned only with mean camber line of section. Examples and detailed computations illustrate application of method, which is applicable to all propeller sections. Characteristics obtained were in perfect agreement with data calculated by exact method of arbitrary airfoil theory.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 760
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Book Description
Reproductions of reports, some declassified, of research done at Langley Memorial Aeronautical Laboratory during World War II. The order of reports does not represent when they were chronologically issued. Reference to the original version of each report is included.
Author: Donnell Wayne Dutton
Publisher:
ISBN:
Category : Propellers, Aerial
Languages : en
Pages : 26
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Author: Julian D. Maynard
Publisher:
ISBN:
Category : Aerofoils
Languages : en
Pages : 16
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Book Description
Propellers with trailing-edge extensions were studied to determine aerodynamic characteristics. Trailing-edge extension increased power absorbed by propeller with little loss in efficiency. Power coefficient for maximum efficiency was greater for 20 percent camber type extension than for 20 percent straight type extension over range of advance ratio of 1.0 to 2.5 although camber type was less efficient. Efficiency was about the same for cruising and high-speed at a high power coefficient for propeller with extension.
Author: United States. National Advisory Committee for Aeronautics
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 400
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 382
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Author: Carl A. Sandahl
Publisher:
ISBN:
Category : Aerodynamic load
Languages : en
Pages : 50
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Book Description
Summary: Some of the effects of pusher-propeller operation on the aerodynamic characteristics of a flapped wing were measured in the Langley propeller-research tunnel. The effects of propeller operation on the lift and profile drag of the wing, on pressure distribution, and on the position of boundary-layer transition were obtained. The results indicated that, at fixed angles of attack and with flaps deflected, the wing lift increased appreciably with increasing thrust coefficient. With flaps retracted, no appreciable increase in lift with increases in thrust coefficient was measured. Chordwise pressure distributions at several spanwise stations indicated that the effect of propeller operation was greatest in the region immediately ahead of the propeller and that the effect extended out-board from the propeller axis for about 2.5 propeller radii. Measurements of boundary-layer velocity on the forward part of the upper surface of the wing showed no appreciable shift of transition in the range of thrust coefficients investigated.
Author: United States. National Advisory Committee for Aeronautics
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 712
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Book Description
