Author: Arthur W. Carter
Publisher:
ISBN:
Category : Ground-cushion phenomenon
Languages : en
Pages : 32
Book Description
An investigation has been made to determine the effect of ground proximity on the aerodynamic characteristics of aspect-ratio-1 airfoils. The investigation was made with the model moving over the water in a towing tank in order to eliminate the effects of wind-tunnel walls and of boundary layer on ground boards at small ground clearances. The results indicated that, as the ground was approached, the airfoils experienced an increase in lift-curve slope and a reduction in induced drag thus, lift-drag ratio was increased. As the ground was approached, the profile drag remained essentially constant for each airfoil. Near the ground, the addition of end plates to the airfoil resulted in a large increase in lift-drag ratio. The lift characteristics of the airfoils indicated stability of height at positive angles of attack and instability of height at negative angles; therefore, the operating range of angles of attack would be limited to positive values. At positive angles of attack, the static longitudinal stability was increased as the height above the ground was reduced. Comparison of the experimental data with Wieselsberger's ground-effect theory (NACA Technical Memorandum 77) indicated generally good agreement between experiment and theory for the airfoils without end plates.
Effect of Ground Proximity on the Aerodynamic Characteristics of Aspect-ratio-1 Airfoils with and Without End Plates
Author: Arthur W. Carter
Publisher:
ISBN:
Category : Ground-cushion phenomenon
Languages : en
Pages : 32
Book Description
An investigation has been made to determine the effect of ground proximity on the aerodynamic characteristics of aspect-ratio-1 airfoils. The investigation was made with the model moving over the water in a towing tank in order to eliminate the effects of wind-tunnel walls and of boundary layer on ground boards at small ground clearances. The results indicated that, as the ground was approached, the airfoils experienced an increase in lift-curve slope and a reduction in induced drag thus, lift-drag ratio was increased. As the ground was approached, the profile drag remained essentially constant for each airfoil. Near the ground, the addition of end plates to the airfoil resulted in a large increase in lift-drag ratio. The lift characteristics of the airfoils indicated stability of height at positive angles of attack and instability of height at negative angles; therefore, the operating range of angles of attack would be limited to positive values. At positive angles of attack, the static longitudinal stability was increased as the height above the ground was reduced. Comparison of the experimental data with Wieselsberger's ground-effect theory (NACA Technical Memorandum 77) indicated generally good agreement between experiment and theory for the airfoils without end plates.
Publisher:
ISBN:
Category : Ground-cushion phenomenon
Languages : en
Pages : 32
Book Description
An investigation has been made to determine the effect of ground proximity on the aerodynamic characteristics of aspect-ratio-1 airfoils. The investigation was made with the model moving over the water in a towing tank in order to eliminate the effects of wind-tunnel walls and of boundary layer on ground boards at small ground clearances. The results indicated that, as the ground was approached, the airfoils experienced an increase in lift-curve slope and a reduction in induced drag thus, lift-drag ratio was increased. As the ground was approached, the profile drag remained essentially constant for each airfoil. Near the ground, the addition of end plates to the airfoil resulted in a large increase in lift-drag ratio. The lift characteristics of the airfoils indicated stability of height at positive angles of attack and instability of height at negative angles; therefore, the operating range of angles of attack would be limited to positive values. At positive angles of attack, the static longitudinal stability was increased as the height above the ground was reduced. Comparison of the experimental data with Wieselsberger's ground-effect theory (NACA Technical Memorandum 77) indicated generally good agreement between experiment and theory for the airfoils without end plates.
Effects of Ground Proximity on the Longitudinal Aerodynamic Characteristics of an Unswept Aspect-ratio-10 Wing
Author: Arthur W. Carter
Publisher:
ISBN:
Category : Ground-cushion phenomenon
Languages : en
Pages : 68
Book Description
Ground proximity effects of unswept aspect ratio 10 wing on longitudinal aerodynamic characteristics.
Publisher:
ISBN:
Category : Ground-cushion phenomenon
Languages : en
Pages : 68
Book Description
Ground proximity effects of unswept aspect ratio 10 wing on longitudinal aerodynamic characteristics.
Index to NASA Technical Publications
Author: United States. National Aeronautics and Space Administration
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
NASA Technical Note
Monthly Catalog of United States Government Publications
Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1248
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1248
Book Description
Monthly Catalog of United States Government Publications
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1878
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1878
Book Description
Monthly Catalog of United States Government Publications, Cumulative Index
Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 1250
Book Description
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 1250
Book Description
Effect of Ground Proximity on the Longitudinal Aerodynamic Characteristics of an Aspect-ratio-1 Wing with and Without Wing-tip Blowing
Author: Raymond E. Mineck
Publisher:
ISBN:
Category : Ground-cushion phenomenon
Languages : en
Pages : 60
Book Description
Publisher:
ISBN:
Category : Ground-cushion phenomenon
Languages : en
Pages : 60
Book Description
USAF Stability and Control Datcom
Author: Douglas Aircraft Company
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 620
Book Description
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 620
Book Description
Aerodynamic Considerations on the Injection of Tornado-generated Missiles from Ground Level Into Tornado Flow Fields
Author: Robert T. Hall
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 108
Book Description
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 108
Book Description