Download or read book Wind tunnel Acoustic Results of Two Rotor Models with Several Tip Designs written by Ruth McVoy Martin and published by . This book was released on 1986 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wind tunnel Test of an Articulated Helicopter Rotor Model with Several Tip Shapes written by John D. Berry and published by . This book was released on 1980 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: A wind-tunnel investigation has been conducted using an articulated helicopter model rotor system to determine the effects of several blade tip designs on both the performance and acoustic characteristics of the rotor. Only the performance characteristics are presented in this paper. Six tip shapes were tested: a square (baseline) tip, an ogee tip, a subwing tip, a swept tip, a winglet tip, and a short ogee tip. Tests were conducted at two rotor rotational speeds and five advance ratios including hover. In hover at the lower rotational speed and a given lift coefficient, the swept, ogee, and short ogee tips had about the same torque coefficient, and the subwing and winglet tips had a larger torque coefficient than the baseline square tip blades. In simulated forward flight, the ogee tip had values of torque coefficient very close to or less than the baseline square tip blades. In simulated forward flight at 1200 rpm, the ogee tips showed a decrease in torque coefficient relative to the baseline blades as drag coefficient decreased. The swept tip blades required less torque coefficient at lower rotational speeds than the baseline square tip blades and roughly equivalent torque coefficient at higher rotational speeds in forward flight. The short ogee tip was tested in limited forward flight conditions and it required higher torque coefficient at higher lift coefficient than the baseline square tip blade. (Author).
Download or read book NASA Technical Paper written by and published by . This book was released on 1990 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Paper written by United States. National Aeronautics and Space Administration and published by . This book was released on 1988 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1994 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1990-11 with total page 1432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on with total page 1224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Aeronautical Engineering written by and published by . This book was released on 1991 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Acoustic Test of a Model Rotor and Tail Rotor Results for the Isolated Rotors and Combined Configuration written by and published by . This book was released on 1989 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Information Output of the Langley Research Center for Calendar Year 1986 written by Langley Research Center. Research Information and Applications Division and published by . This book was released on 1987 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aeronautical Engineering A Cumulative Index to a Continuing Bibliography supplement 261 written by and published by . This book was released on 1991 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book DGLR AIAA 14th Aeroacoustics Conference written by Hanno H.. Heller and published by . This book was released on 1992 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Correlation of Helicopter Impulsive Noise from Blade vortex Interaction with Rotor Mean Inflow written by Andrew B. Connor and published by . This book was released on 1987 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advancing side Directivity and Retreating side Interactions of Model Rotor Blade vortex Interaction Noise written by and published by . This book was released on 1988 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advancing side Directivity and Retreating side Interactions of Model Rotor Blade vortex Interaction Noise written by Ruth McVoy Martin and published by . This book was released on 1988 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aeromechanics Technology Product Design for the 21st Century written by and published by . This book was released on 1995 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
