Author: William A. Newsom (Jr)
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
Book Description
An investigation has been made to study the effect of ground proximity on the aerodynamic characteristics of two jet vertical-take-off-and-landing airplane models in which the fuselage remains in a horizontal attitude for the take-off and landing. The first model (called the tilt-wing model) had a tilting wing-engine assembly which was set at 90 deg incidence for the take-off and landing. The second model, called the deflected-jet model) had a cascade of retractable turning vanes to deflect the exhaust of the horizontally mounted jet engines downward for vertical take-off and landing while the entire model remained in a horizontal attitude. With the models at various heights above the ground in the take-off and landing configuration, the lift, drag, and pitching moment were measured and tuft surveys were made to determine the flow field caused by the jet exhaust. The tilt-wing model experienced a loss of lift of less than 3 percent near the ground. The deflected-jet model, however, suffered losses in lift as high as 45 percent near the ground because of a low pressure region under the model caused by the entrainment of air by the jet exhaust as it spread out along the ground. This loss in lift for the deflected-jet configuration could probably be reduced to less than 5 percent by the use of a longer landing gear and a high wing location.
Effect of Ground Proximity on Aerodynamic Characteristics of Two Horizontal-Attitude Jet Vertical-Take-Off-and-Landing Airplane Models
Author: William A. Newsom (Jr)
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
Book Description
An investigation has been made to study the effect of ground proximity on the aerodynamic characteristics of two jet vertical-take-off-and-landing airplane models in which the fuselage remains in a horizontal attitude for the take-off and landing. The first model (called the tilt-wing model) had a tilting wing-engine assembly which was set at 90 deg incidence for the take-off and landing. The second model, called the deflected-jet model) had a cascade of retractable turning vanes to deflect the exhaust of the horizontally mounted jet engines downward for vertical take-off and landing while the entire model remained in a horizontal attitude. With the models at various heights above the ground in the take-off and landing configuration, the lift, drag, and pitching moment were measured and tuft surveys were made to determine the flow field caused by the jet exhaust. The tilt-wing model experienced a loss of lift of less than 3 percent near the ground. The deflected-jet model, however, suffered losses in lift as high as 45 percent near the ground because of a low pressure region under the model caused by the entrainment of air by the jet exhaust as it spread out along the ground. This loss in lift for the deflected-jet configuration could probably be reduced to less than 5 percent by the use of a longer landing gear and a high wing location.
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
Book Description
An investigation has been made to study the effect of ground proximity on the aerodynamic characteristics of two jet vertical-take-off-and-landing airplane models in which the fuselage remains in a horizontal attitude for the take-off and landing. The first model (called the tilt-wing model) had a tilting wing-engine assembly which was set at 90 deg incidence for the take-off and landing. The second model, called the deflected-jet model) had a cascade of retractable turning vanes to deflect the exhaust of the horizontally mounted jet engines downward for vertical take-off and landing while the entire model remained in a horizontal attitude. With the models at various heights above the ground in the take-off and landing configuration, the lift, drag, and pitching moment were measured and tuft surveys were made to determine the flow field caused by the jet exhaust. The tilt-wing model experienced a loss of lift of less than 3 percent near the ground. The deflected-jet model, however, suffered losses in lift as high as 45 percent near the ground because of a low pressure region under the model caused by the entrainment of air by the jet exhaust as it spread out along the ground. This loss in lift for the deflected-jet configuration could probably be reduced to less than 5 percent by the use of a longer landing gear and a high wing location.
Effect on to Ground Proximity Aerodynamic Characteristics of Two Horizontal-attitude Checked Vertical-take-off-and-landing Airplane Models
Author:
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 0
Book Description
An investigation has been made to study the effects of ground proximity on the aerodynamic characteristics of two jet vertical-take-off-and-landing. The first model (public tilt-wing model) had a tilting wing-engine assembly which was set at 90 degrees incidence for the take-off and landing. The second model (called the deflected-jet model) had a cascade of retractable turning vanes to deflect take-off and landing while the entire model remained in a horizontal attitude. With the models at various heights above the ground in the take-off and landing configuration, the lift, drag, and pitching moments were measured and tuft surveys were made to determine the flow field caused by the jet exhaust. The tilt-winged model experienced a loss of left or less than 3 percent near the ground. The deflected-jet model, however, suffered losses in lift as high as 45 percent near the ground because of a low pressure region under the model caused by the entrainment of air by the jet exhaust as it spread adults along the ground. This loss in an lift for the deflected-jet configuration could probably be reduced to less than 5 percent by the use of a longer landing gear and a high wing location.
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 0
Book Description
An investigation has been made to study the effects of ground proximity on the aerodynamic characteristics of two jet vertical-take-off-and-landing. The first model (public tilt-wing model) had a tilting wing-engine assembly which was set at 90 degrees incidence for the take-off and landing. The second model (called the deflected-jet model) had a cascade of retractable turning vanes to deflect take-off and landing while the entire model remained in a horizontal attitude. With the models at various heights above the ground in the take-off and landing configuration, the lift, drag, and pitching moments were measured and tuft surveys were made to determine the flow field caused by the jet exhaust. The tilt-winged model experienced a loss of left or less than 3 percent near the ground. The deflected-jet model, however, suffered losses in lift as high as 45 percent near the ground because of a low pressure region under the model caused by the entrainment of air by the jet exhaust as it spread adults along the ground. This loss in an lift for the deflected-jet configuration could probably be reduced to less than 5 percent by the use of a longer landing gear and a high wing location.
Effect on to Ground Proximity Aerodynamic Characteristics of Two Horizontal-attitude Checked Vertical-take-off-and-landing Airplane Models
Author:
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 20
Book Description
An investigation has been made to study the effects of ground proximity on the aerodynamic characteristics of two jet vertical-take-off-and-landing. The first model (public tilt-wing model) had a tilting wing-engine assembly which was set at 90 degrees incidence for the take-off and landing. The second model (called the deflected-jet model) had a cascade of retractable turning vanes to deflect take-off and landing while the entire model remained in a horizontal attitude. With the models at various heights above the ground in the take-off and landing configuration, the lift, drag, and pitching moments were measured and tuft surveys were made to determine the flow field caused by the jet exhaust. The tilt-winged model experienced a loss of left or less than 3 percent near the ground. The deflected-jet model, however, suffered losses in lift as high as 45 percent near the ground because of a low pressure region under the model caused by the entrainment of air by the jet exhaust as it spread adults along the ground. This loss in an lift for the deflected-jet configuration could probably be reduced to less than 5 percent by the use of a longer landing gear and a high wing location.
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 20
Book Description
An investigation has been made to study the effects of ground proximity on the aerodynamic characteristics of two jet vertical-take-off-and-landing. The first model (public tilt-wing model) had a tilting wing-engine assembly which was set at 90 degrees incidence for the take-off and landing. The second model (called the deflected-jet model) had a cascade of retractable turning vanes to deflect take-off and landing while the entire model remained in a horizontal attitude. With the models at various heights above the ground in the take-off and landing configuration, the lift, drag, and pitching moments were measured and tuft surveys were made to determine the flow field caused by the jet exhaust. The tilt-winged model experienced a loss of left or less than 3 percent near the ground. The deflected-jet model, however, suffered losses in lift as high as 45 percent near the ground because of a low pressure region under the model caused by the entrainment of air by the jet exhaust as it spread adults along the ground. This loss in an lift for the deflected-jet configuration could probably be reduced to less than 5 percent by the use of a longer landing gear and a high wing location.
Effect of Ground Proximity on Aerodynamic Characteristics of Two Horizontal-attitude Jet Vertical-take-off-and-landing Airplane Models
Author: William A. Newsom
Publisher:
ISBN:
Category : Charts, diagrams, etc
Languages : en
Pages : 20
Book Description
An investigation has been made to study the effect of ground proximity on the aerodynamic characteristics of two jet vertical-take-off-and-landing airplane models in which the fuselage remains in a horizontal attitude for the take-off and landing.
Publisher:
ISBN:
Category : Charts, diagrams, etc
Languages : en
Pages : 20
Book Description
An investigation has been made to study the effect of ground proximity on the aerodynamic characteristics of two jet vertical-take-off-and-landing airplane models in which the fuselage remains in a horizontal attitude for the take-off and landing.
NASA Technical Note
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1196
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1196
Book Description
Index of NASA Technical Publications
Author: United States. National Aeronautics and Space Administration
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 448
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 448
Book Description
Investigation of Interference of a Deflected Jet with Free Stream and Ground on Aerodynamic Characteristics of a Semispan Delta-wing VTOL Model
Author: Kenneth P. Spreemann
Publisher:
ISBN:
Category : Aerodynamic load
Languages : en
Pages : 98
Book Description
Publisher:
ISBN:
Category : Aerodynamic load
Languages : en
Pages : 98
Book Description
Index of NACA Technical Publications
Author: United States. National Advisory Committee for Aeronautics
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 860
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 860
Book Description
Effect of Ground Proximity on the Aerodynamic Characteristics of a Four-engine Vertical-take-off-and-landing Transport-airplane Model with Tilting Wing and Propellers
Author: William A. Newsom
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 15
Book Description
An investigation has been made to study the effect of ground proximity on the aerodynamic characteristics of a four-engine vertical-take-off-and-land transport-airplane model with tilting wing and propellers. Tests were made with the wing at an angle of incidence of 90 degrees, the position used for vertical take-off or landing.
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 15
Book Description
An investigation has been made to study the effect of ground proximity on the aerodynamic characteristics of a four-engine vertical-take-off-and-land transport-airplane model with tilting wing and propellers. Tests were made with the wing at an angle of incidence of 90 degrees, the position used for vertical take-off or landing.
Index of NASA Technical Publications
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 494
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 494
Book Description