Aerodynamic Characteristics Of A 4 Foot Diameter Ducted Fan Mounted On The Tip Of A Semispan Wing
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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).
Nasa Technical Note
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Author :
language : en
Publisher:
Release Date : 1971
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 1971 with categories.
A Wind Tunnel Investigation Of A 4 Foot Diameter Ducted Fan Mounted On The Tip Of A Semispan Wing
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Author : Paul F. Yaggy
language : en
Publisher:
Release Date : 1961
A Wind Tunnel Investigation Of A 4 Foot Diameter Ducted Fan Mounted On The Tip Of A Semispan Wing written by Paul F. Yaggy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with Airplanes categories.
The Effectiveness Of Three Exit Vane Cascade Configurations For Vectoring The Thrust Of A Ducted Fan
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Author : Kenneth W. Mort
language : en
Publisher:
Release Date : 1964
The Effectiveness Of Three Exit Vane Cascade Configurations For Vectoring The Thrust Of A Ducted Fan 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 1964 with Ducted fans categories.
Technical Publications Announcements With Indexes
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Author : United States. National Aeronautics and Space Administration
language : en
Publisher:
Release Date : 1962
Technical Publications Announcements With Indexes written by United States. National Aeronautics and Space Administration and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with Aeronautics categories.
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.
Guide To Annual Subject Index For Technical Publications Announcements Apr Dec 1962
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Author : United States. National Aeronautics and Space Administration
language : en
Publisher:
Release Date : 1962
Guide To Annual Subject Index For Technical Publications Announcements Apr Dec 1962 written by United States. National Aeronautics and Space Administration and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with Aeronautics categories.
Ducted Fan Design Volume 1 Propulsion Physics And Design Of Fans And Long Chord Ducts
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Author : Marc de Piolenc
language : en
Publisher: Lulu.com
Release Date :
Ducted Fan Design Volume 1 Propulsion Physics And Design Of Fans And Long Chord Ducts written by Marc de Piolenc and has been published by Lulu.com this book supported file pdf, txt, epub, kindle and other format this book has been release on 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.