Air Propeller in Yaw PDF Download
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Author: E. P. Lesley
Publisher:
ISBN:
Category :
Languages : en
Pages : 15
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Author: E. P. Lesley
Publisher:
ISBN:
Category :
Languages : en
Pages : 15
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Author: Herbert S. Ribner
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 88
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Summary: It was realized as early as 1909 that a propeller in yaw develops a side force like that of a fin. In 1917, R.G. Harris expressed this force in terms of the torque coefficient for the unyawed propeller. Of several attempts to express the side force directly in terms of the shape of the blades, however, none has been completely satisfactory. An analysis that incorporates induction effects not adequately covered in previous work and that gives good agreement with experiment over a wide range of operating conditions is presented herein. The present analysis shows that the fin analogy may be extended to the form of the side-force expression and that the effective fin area may be taken as the projected side area of the propeller. The effective aspect ratio is of the order of 8 and the appropriate dynamic pressure is roughly that at the propeller disk as augmented by the inflow. The variation of the inflow velocity, for a fixed-pitch propeller, accounts for most of the variation of side force with advance-diameter ration V/nD.
Author: William Frederick Durand
Publisher:
ISBN:
Category :
Languages : en
Pages : 37
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Author: Franz Misztal
Publisher:
ISBN:
Category : Propellers, Aerial
Languages : en
Pages : 33
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The quantity of air which the disk area described by propeller blades travels through, is accelerated rearward conformably to the momentum of the forces acting on the propeller. The accelerated air mass forms behind the propeller the so-called slipstream, in which among others, the mean velocity of advance is increased. If the propeller axis slopes toward the relative flight direction, the slipstream direction likewise changes, i.e., it sets up a downwash behind the propeller. It was shown how this deviation can be mathematically defined. With appreciable slope the momentum of the slipstream is partially split up in the surrounding air because of the circulation, and the downwash of the slipstream is diminished.
Author: Everett Parker Lesley
Publisher:
ISBN:
Category : Propellers, Aerial
Languages : en
Pages : 15
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Author: R. H. Neely
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 68
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Tests were made n the NACA 29-foot pressure tunnel to determine the yaw characteristics of a 0.32-scale model of a single-engine, fighter-type airplane with six-blade single-rotating and dual-rotating propellers. The propellers used in the investigation were of the same solidity and plan form. Force and moment characteristics of the model, with the exception of the rolling-moment characteristics, are presented for several model and power conditions. Curves are given that show estimated rudder-control characteristics of the design airplane in steady sideslips.
Author: United States. National Advisory Committee for Aeronautics
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 37
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Author: Bruce Morgan Richardson
Publisher:
ISBN:
Category : Propellers, Aerial
Languages : en
Pages :
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Author: Everett Parker Lesley
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 108
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Author: United States. National Advisory Committee for Aeronautics
Publisher:
ISBN:
Category : Aerofoils
Languages : en
Pages : 218
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