Aerodynamic Characteristics Of Three Helicopter Rotor Airfoil Sections At Reynolds Number From Model Scale To Full Scale At Mach Numbers From 0 35 To 0 90
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Nasa Sp
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Author :
language : en
Publisher:
Release Date : 1990
Nasa Sp written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Aeronautics categories.
Aeronautical Engineering
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language : en
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Release Date : 1990
Aeronautical Engineering written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Aeronautics categories.
A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).
International Aerospace Abstracts
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Author :
language : en
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Release Date : 1996
International Aerospace Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Aeronautics categories.
Aerodynamic Characteristics Of Three Helicopter Rotor Airfoil Sections At Reynolds Number From Model Scale To Full Scale At Mach Numbers From 0 35 To 0 90
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Author :
language : en
Publisher:
Release Date : 1980
Aerodynamic Characteristics Of Three Helicopter Rotor Airfoil Sections At Reynolds Number From Model Scale To Full Scale At Mach Numbers From 0 35 To 0 90 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with categories.
Government Reports Announcements Index
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language : en
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Release Date : 1991-03
Government Reports Announcements Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991-03 with Science categories.
Aerodynamic Characteristics Of Three Helicopter Rotor Airfoil Sections At Reynolds Numbers From Model Scale To Full Scale At Mach Numbers From 0 35 To 0 90
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Author :
language : en
Publisher:
Release Date : 1980
Aerodynamic Characteristics Of Three Helicopter Rotor Airfoil Sections At Reynolds Numbers From Model Scale To Full Scale At Mach Numbers From 0 35 To 0 90 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with categories.
An investigation was conducted in the Langley 6- by 28-Inch Transonic Tunnel to determine the two-dimensional aerodynamic characteristics of three helicopter rotor airfoils at Reynolds numbers from typical model scale to full scale at Mach numbers from about 0.35 to 0.90. The model-scale Reynolds numbers ranged from about 0.7 times 10 to the 6th power to 1.5 times 10 to the 6th power and the full-scale Reynolds numbers ranged from about 3.0 times 10 to the 6th power to 6.6 times 10 to the 6th power. The airfoils tested were the NACA 0012 (0 deg Tab), the SC 1095-R8, and the SC 1095. Both the SC 1095 and the SC 1095-R8 airfoils a had trailing-edge tabs. The results of this investigation indicate that Reynolds number effects can be significant on the maximum normal-force coefficient and all drag-related parameters; namely, drag at zero normal force, maximum normal-force--drag-ratio, and drag-divergence Mach number. In general, the increments in these parameters at a given Mach number owing to the model-scale to full-scale Reynolds number change are different for each of the airfoils. (Author).
Aerodynamic Characteristics Of Three Helicopter Rotor Airfoil Sections At Reynolds Numbers From Model Scale To Full Scale At Mach Numbers From 0 35 To 0 90
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Author : Kevin W. Noonan
language : en
Publisher:
Release Date : 1980
Aerodynamic Characteristics Of Three Helicopter Rotor Airfoil Sections At Reynolds Numbers From Model Scale To Full Scale At Mach Numbers From 0 35 To 0 90 written by Kevin W. Noonan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Aerofoils categories.
Effect On Helicopter Performance Of Modifications In Profile Drag Characteristics Of Rotor Blade Airfoil Sections
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Author : F. B. Gustafson
language : en
Publisher:
Release Date : 1944
Effect On Helicopter Performance Of Modifications In Profile Drag Characteristics Of Rotor Blade Airfoil Sections written by F. B. Gustafson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1944 with Aerodynamics categories.
Summary: Performance calculations are presented for a typical helicopter rotor in which three types of airfoil section were successively used. The types represented are the rough conventional, the smooth conventional, and the laminar-flow or low-drag sections as developed for helicopter use. The performance items covered are rotor thrust for fixed power in hovering, range and endurance at cruising speed, and power required at a relatively high forward speed. Contours showing the conditions of operation encountered by the blade section and weighting curves showing the relative importance of the various section angles of attack for specified flight conditions are included as an aid in the interpretation of the results. The calculations indicated that the use of a smooth conventional section will result in marked performance gains throughout the flight range. Definite, though smaller, additional gains in take-off weight and in range and endurance may be realized by the use of a low-drag section. At high forward speeds or at moderate forward speeds and high loadings, however, losses are indicated for the low-drag sections in contrast with the smooth conventional sections. It is demonstrated that, if these losses are to be avoided, the low-drag sections must be designed to avoid the extreme rise in drag coefficient at the higher angles of attack which is characteristic of the low-drag sections now available for use in helicopters.
Two Dimensional Aerodynamic Characteristics Of Several Rotorcraft Airfoils At Mach Numbers From 0 35 To 0 90
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Author :
language : en
Publisher:
Release Date : 1977
Two Dimensional Aerodynamic Characteristics Of Several Rotorcraft Airfoils At Mach Numbers From 0 35 To 0 90 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with categories.
Two Dimensional Aerodynamic Characteristics Of Three Rotorcraft Airfoils At Mach Numbers From 0 35 To 0 90
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Author :
language : en
Publisher:
Release Date : 1982
Two Dimensional Aerodynamic Characteristics Of Three Rotorcraft Airfoils At Mach Numbers From 0 35 To 0 90 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.