Aerodynamic Characteristics Of A Powered Semispan Tilting Shrouded Propeller Vtol Model In Hovering And Transition Flight
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Aerodynamic Characteristics Of A Powered Semispan Tilting Shrouded Propeller Vtol Model In Hovering And Transition Flight
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Author : Kenneth W. Goodson
language : en
Publisher:
Release Date : 1962
Aerodynamic Characteristics Of A Powered Semispan Tilting Shrouded Propeller Vtol Model In Hovering And Transition Flight written by Kenneth W. Goodson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with Aerodynamics categories.
"An investigation of the aerodynamic characteristics of a powered semispan tilting-shrouded-propeller configuration has been conducted in the 17-foot test section of the Langley 300-MPH 7- by 10-foot tunnel. The wing had an aspect ratio of 2.67 (based on wing span of 60 inches), a taper ratio of 0.67, and an NACA 2418 airfoil section with a 15-inch-diameter shrouded propeller mounted on the tip. The test results show that large nose-up pitching moments are obtained at transitional speeds of about 40 knots and duct angle of about 70°. Decelerating flight procedures further increases in the nose-up moment. Ground proximity reduces the nose-up pitching moments. The large nose-up moments can be trimmed by use of duct-exit control vanes. The results show that unloading the duct (shroud) by flying at a wing angle of attack of 15° reduces the power required by about 30 percent at 50 knots. Duct-lip stall produces large increases in power required. The results in general show that full-scale aerodynamic simulation can be made with small-scale wind-tunnel models if duct-lip separation at low Reynolds numbers is avoided."--Summary.
Nasa Technical Note
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Author :
language : en
Publisher:
Release Date : 1966
Nasa Technical Note written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with categories.
An Analytical Study Of V Stol Handling Qualities In Hover And Transition
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Author : R. L. Stapleford
language : en
Publisher:
Release Date : 1965
An Analytical Study Of V Stol Handling Qualities In Hover And Transition written by R. L. Stapleford and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965 with Airplanes categories.
The hover analysis considers pilot attitude and position control tasks in the presence of horizontal gusts. The effects of each of the stability derivatives on the difficulty of the control tasks and on the closed-loop gust responses are determined. It is clearly shown that the handling qualities studies of control sensitivity and angular damping must consider the influences of M sub u (or L sub v) and should include gust inputs. These conclusions are substantiated by previous variable-stability-helicopter experiments. The effects of vehicle size and geometry are investigated by several approaches. The key result of increasing size is found to be a reduction in M sub u and L sub v which can, in turn, lower the requirements for control power and damping. The handling qualities during transition of two vehicles, a tilt duct and a tilt wing, which were previously tested on a simulator are analyzed. It is shown that both trim control and perturbations about the trim conditions must be considered. In fact, part of the increased difficulty in landing transitions, in comparison with takeoff transitions, is due to more difficult trim control; the much more stringent position control requirements in landing are also a contributing factor.
Division Of Aerodynamic Loads On A Semispan Tilting Ducted Propeller Model In Hovering And Transition Flight
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Author : Kalman J. Grunwald
language : en
Publisher:
Release Date : 1962
Division Of Aerodynamic Loads On A Semispan Tilting Ducted Propeller Model In Hovering And Transition Flight written by Kalman J. Grunwald and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with Aerodynamic load categories.
Aerodynamic Loads On An Isolated Shrouded Propeller Configuration Of Angles Of Attack From 10 Degrees To 110 Degrees
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Author : Kalman J. Grunwald
language : en
Publisher:
Release Date : 1962
Aerodynamic Loads On An Isolated Shrouded Propeller Configuration Of Angles Of Attack From 10 Degrees To 110 Degrees written by Kalman J. Grunwald and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with Propulsion systems categories.
Aerodynamic Characteristics Of A 4 Foot Diameter Ducted Fan Mounted On The Tip Of A Semispan Wing
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Author : Kenneth W. Mort
language : en
Publisher:
Release Date : 1962
Aerodynamic Characteristics Of A 4 Foot Diameter Ducted Fan Mounted On The Tip Of A Semispan Wing written by Kenneth W. Mort and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with Airplanes categories.
Power, free-stream velocity, and duct angle of attack were varied at several wing angles of attack to define the aerodynamic characteristics of the ducted fan, wing, and of the ducted fan wing together. At large duct angles of attack, the inside of the upstream duct lip stalled causing a rapid change in the duct pitching moments and an accompanying increase in the power required. At low horizontal velocities, this lip stall would probably limit the rate of descent of a vehicle with a wing-tip-mounted ducted fan. During low-speed, level, unaccelerated flight (30 to 80 knots) it appeared that a vehicle, with a configuration similar to that examined, would require less power if it were supported by a wing and ducted fans than if it were supported only by ducted fans. (Author).
Monthly Catalog Of United States Government Publications
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Author :
language : en
Publisher:
Release Date : 1962
Monthly Catalog Of United States Government Publications written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with Government publications categories.
Monthly Catalog Of United States Government Publications
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Author : United States. Superintendent of Documents
language : en
Publisher:
Release Date : 1961
Monthly Catalog Of United States Government Publications written by United States. Superintendent of Documents and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with Government publications categories.
Monthly Catalog Of United States Government Publications Cumulative Index
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Author : United States. Superintendent of Documents
language : en
Publisher:
Release Date : 1980
Monthly Catalog Of United States Government Publications Cumulative Index written by United States. Superintendent of Documents and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with United States categories.
U S Government Research Reports
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Author :
language : en
Publisher:
Release Date : 1962
U S Government Research Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with Science categories.