Download or read book Experimental Smoke and Electromagnetic Analog Study of Induced Flow Field about a Model Rotor in Steady Flight Within Ground Effect written by Robin B. Gray and published by . This book was released on 1960 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hovering and steady low-speed forward-flight tests were run on a 4-foot-diameter rotor at a ground height of 1 rotor radius. The two blades had a 2 to 1 taper ratio and were mounted in a see-saw hub. The solidity ratio was 0.05. Measurements were made of the rotor rpm, collective pitch, and forward-flight velocity. Smoke was introduced into the tip vortex and the resulting vortex pattern was photographed from two positions. Using the data obtained from these photographs, wire models of the tip vortex configurations were constructed and the distribution of the normal component of induced velocity at the blade feathering axis that is associated with these tip vortex configurations was experimentally determined at 450 increments in azimuth position from this electromagnetic analog. Three steady-state conditions were analyzed. The first was hovering flight; the second, a flight velocity just under the wake "tuck under" speed; and the third, a flight velocity just above this speed. These corresponded to advance ratios of 0, 0.022, and 0.030 (or ratios of forward velocity to calculated hovering induced velocity of approximately 0, 0.48, and 0.65), respectively, for the model test rotor. Cross sections of the wake at 450 intervals in azimuth angle as determined from the path of the tip vortex are presented graphically for all three cases. The nondimensional normal component of the induced velocity that is associated with the tip vortex as determined by an electromagnetic analog at 450 increments in azimuth position and at the blade feathering axis is presented graphically. It is shown that the mean value of this component of the induced velocity is appreciably less after tuck-under than before. It is concluded that this method yields results of engineering accuracy and is a very useful means of studying vortex fields.

Download or read book NASA Technical Note written by and published by . This book was released on 1960 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Index of NASA Technical Publications written by United States. National Aeronautics and Space Administration and published by . This book was released on 1960 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Helicopter Theory written by Wayne Johnson and published by Courier Corporation. This book was released on 1994-01-01 with total page 1126 pages. Available in PDF, EPUB and Kindle. Book excerpt: The history of the helicopter may be traced back to the Chinese flying top (c. 400 BC) and to the work of Leonardo da Vinci, who sketched designs for a vertical flight machine utilizing a screw-type propeller. In the late 19th-century, Thomas Edison experimented with helicopter models, realizing that no such machine would be able to fly until the development of a sufficiently lightweight engine. When the internal combustion gasoline engine came on the scene around 1900, the stage was set for the real development of helicopter technology. While this text provides a concise history of helicopter development, its true purpose is to provide the engineering analysis required to design a highly successful rotorcraft. Toward that end the book offers thorough, comprehensive coverage of the theory of helicopter flight: the elements of vertical flight, forward flight, performance, design, mathematics of rotating systems, rotary wing dynamics and aerodynamics, aeroelasticity, stability and control, stall, noise and more. Wayne Johnson has worked for the U.S. Army and NASA at the Ames Research Center in California. Through his company Johnson Aeronautics, he is engaged in the development of software that is used throughout the world for the analysis of rotorcraft. In this book, Dr. Johnson has compiled a monumental resource that is essential reading for any student or aeronautical engineer interested in the design and development of vertical-flight aircraft.

Download or read book Optimum Performance and Potential Flow Field of Hovering Rotors written by J. C. Wu and published by . This book was released on 1975 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Catalog of United States Government Publications written by United States. Superintendent of Documents and published by . This book was released on 1960 with total page 1812 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Index to NASA Technical Publications written by United States. National Aeronautics and Space Administration and published by . This book was released on 1960-07 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Selected Listing of NASA Scientific and Technical Reports for written by and published by . This book was released on 1960 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Glideway System written by Massachusetts Institute of Technology and published by . This book was released on 1966 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1960 with total page 1006 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aerodynamic Problems Associated with V STOL Aircraft Propeller and rotor aerodynamics written by and published by . This book was released on 1966 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1961 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Journal of Air Law and Commerce written by and published by . This book was released on 1969 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes section "Book reviews."

Download or read book A Study of NACA and NASA Published Information of Pertinence in the Design of Light Aircraft written by James C. Williams and published by . This book was released on 1970 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report investigates critical reviews of NACA and NASA report literature on aerodynamics and aerodynamic load calculations for light aircraft design.

Download or read book NASA SP written by and published by . This book was released on 1985 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The National Union Catalogs 1963 written by and published by . This book was released on 1964 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The National union catalog 1968 1972 written by and published by . This book was released on 1973 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt: