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A Redesigned Tail Rotor for Improvement of Ch-53e High-Altitude Performance - Tapa blanda

Pritchard, James A.

 
9781249401230: A Redesigned Tail Rotor for Improvement of Ch-53e High-Altitude Performance
Tapa blanda
ISBN 10: 1249401232 ISBN 13: 9781249401230
Editorial: BiblioScholar, 2012

Sinopsis


The Global War on Terror with specific emphasis on the recent military operation in Afghanistan has shown the invaluable contribution that heavy lift helicopters bring to the combatant commander. However, the flight range, altitudes and lift capability required to operate effectively in such an austere environment are pushing the limits of these helicopters. In an attempt to increase the operational capability of the CH-53E, this study will investigate methods for maximizing tail rotor effectiveness at high gross weights and high altitudes. This thesis records an analytical study designed to investigate the intricacies of tail rotor design and, by the computational simulation afforded through the Rotorcraft Comprehensive Analysis System (RCAS), define a tail rotor at high altitude that will reduce the tail rotor power required in hover by 10%. The versatility required of the tail rotor is seen due to the nature of the flow regime, which requires the tail rotor to effectively operate with inflow velocity from any direction, with a spanwise distribution of flow that produces Reynolds numbers up to 5.6e7 and with pilot commanded pitch changes from -10 to 24 degrees. With little to no assistance from the vertical fin, the tail rotor is most heavily relied on for antitorque response in hover; therefore, focus will be placed on hovering efficiencies tempered by solid forward flight and hover slide performance.

"Sinopsis" puede pertenecer a otra edición de este libro.

Reseña del editor


The Global War on Terror with specific emphasis on the recent military operation in Afghanistan has shown the invaluable contribution that heavy lift helicopters bring to the combatant commander. However, the flight range, altitudes and lift capability required to operate effectively in such an austere environment are pushing the limits of these helicopters. In an attempt to increase the operational capability of the CH-53E, this study will investigate methods for maximizing tail rotor effectiveness at high gross weights and high altitudes. This thesis records an analytical study designed to investigate the intricacies of tail rotor design and, by the computational simulation afforded through the Rotorcraft Comprehensive Analysis System (RCAS), define a tail rotor at high altitude that will reduce the tail rotor power required in hover by 10%. The versatility required of the tail rotor is seen due to the nature of the flow regime, which requires the tail rotor to effectively operate with inflow velocity from any direction, with a spanwise distribution of flow that produces Reynolds numbers up to 5.6e7 and with pilot commanded pitch changes from -10 to 24 degrees. With little to no assistance from the vertical fin, the tail rotor is most heavily relied on for antitorque response in hover; therefore, focus will be placed on hovering efficiencies tempered by solid forward flight and hover slide performance.

Biografía del autor

James A. Pritchard is an environmental historian and an adjunct professor of landscape architecture at Iowa State University.

"Sobre este título" puede pertenecer a otra edición de este libro.

Editorial
BiblioScholar
Año de publicación
2012
Idioma
Inglés
ISBN 10 
1249401232
ISBN 13 
9781249401230
Encuadernación
Tapa blanda
Número de páginas
138
Contacto del fabricante
no disponible
Persona responsable
no disponible