Effect On Helicopter Performance Of Modifications In Profile Drag Characteristics Of Rotor Blade Airfoil Sections
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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.
Considerations Of Methods Of Improving Helicopter Efficiency
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Author : Richard C. Dingeldein
language : en
Publisher:
Release Date : 1961
Considerations Of Methods Of Improving Helicopter Efficiency written by Richard C. Dingeldein and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with Aerodynamics categories.
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.
Wartime Report
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Author : United States. National Advisory Committee for Aeronautics
language : en
Publisher:
Release Date :
Wartime Report written by United States. National Advisory Committee for Aeronautics and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with Aeronautics categories.
Wartime Report
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Author :
language : en
Publisher:
Release Date : 194?
Wartime Report written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 194? with Aeronautics categories.
Reproductions of reports, some declassified, of research done at Langley Memorial Aeronautical Laboratory during World War II. The order of reports does not represent when they were chronologically issued. Reference to the original version of each report is included.
Report National Advisory Committee For Aeronautics
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Author : United States. National Advisory Committee for Aeronautics
language : en
Publisher:
Release Date : 1948
Report National Advisory Committee For Aeronautics written by United States. National Advisory Committee for Aeronautics and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1948 with Aeronautics categories.
Report
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Author :
language : en
Publisher:
Release Date : 1948
Report written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1948 with Aeronautics categories.
Report
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Author : United States. National Advisory Committee for Aeronautics
language : en
Publisher:
Release Date : 1948
Report written by United States. National Advisory Committee for Aeronautics and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1948 with Aeronautics categories.
Annual Report Of The National Advisory Committee For Aeronautics
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Author : United States. National Advisory Committee for Aeronautics
language : en
Publisher:
Release Date : 1947
Annual Report Of The National Advisory Committee For Aeronautics written by United States. National Advisory Committee for Aeronautics and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1947 with Aeronautics categories.
Nasa S Contributions To Aeronautics Volume 2 Flight Environment Nasa Sp 2010 570 Vol 2 2010
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Author : Richard P. Hallion
language : en
Publisher:
Release Date : 2010
Nasa S Contributions To Aeronautics Volume 2 Flight Environment Nasa Sp 2010 570 Vol 2 2010 written by Richard P. Hallion and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.