Download or read book Hover performance tests of full scale variable geometry rotors written by James B. Rorke and published by . This book was released on 1976 with total page 124 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 1987 with total page 1126 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 Hover Performance Characteristics of a Variable Geometry Rotor written by Abraham I. Shaban and published by . This book was released on 1994 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Experimental Investigation of Model Variable geometry and Ogee Tip Rotors written by Anton J. Landgrebe and published by . This book was released on 1974 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation was conducted to systematically explore the effects of inter-blade spatial relationships and pitch variations on rotor performance and wake geometry. Variable-geometry rotors consisting of various combinations of blade length, axial spacing, azimuth spacing, and collective pitch were tested at model scale in hover and forward flight. In addition, a hover test of a model rotor with an ogee blade tip design was conducted to determine its performance and wake characteristics. The results of this investigation indicate that properly selected variable geometry rotor configurations can offer substantial improvements in hover performance without adversely affecting forward flight performance. Axial spacing of alternate blades was found to provide the greatest performance benefit, and further improvements were achieved by combining azimuth spacing with axial spacing. The performance benefit appears to be related to the relief of local adverse aerodynamic phenomena produced by vortex interference. The ogee tip design was found to substantially reduce the concentrated core intensity of the tip vortex, and could thus prove beneficial for the relief of blade-vortex interaction problems. However, the ogee tip was found to reduce hover performance at model scale.

Download or read book Performance and Loads Data from a Hover Test of a Full scale Advanced Technology XV 15 Rotor written by and published by . This book was released on 1986 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hover Performance Characteristics of a Variable Geometry Helicopter Rotor written by Abraham I. Shaban and published by . This book was released on 1993 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance and Loads Data from a Hover Test of a Full scale XV 15 Rotor written by and published by . This book was released on 1985 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 1977 NASA Authorization written by United States. Congress. House. Committee on Science and Technology. Subcommittee on Space Science and Applications and published by . This book was released on 1976 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NASA Authorization for Fiscal Year 1977 written by United States. Congress. Senate. Committee on Aeronautical and Space Sciences and published by . This book was released on 1976 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 1977 ERDA authorization fossil fuels written by United States. Congress. House. Committee on Science and Technology. Subcommittee on Energy Research, Development, and Demonstration (Fossil Fuels) and published by . This book was released on 1976 with total page 3192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Annual Index Keyword A L written by and published by . This book was released on 1976 with total page 1052 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 1979 with total page 1250 pages. Available in PDF, EPUB and Kindle. Book excerpt: February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index

Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on with total page 1386 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Catalog of United States Government Publications Cumulative Index written by United States. Superintendent of Documents and published by . This book was released on 1979 with total page 1504 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Planform Geometry on Hover Performance of a 2 Meter Diameter Model of a Four Bladed Rotor written by Arthur E. Phelps and published by . This book was released on 1986 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hover tests were conducted on three small-scale rotors to evaluate the effect of blade planform taper on rotor hover performance. Tests were conducted on a rectangular swept-tip configuration, on a configuration with a 3-to-1 taper over the outboard 20 percent of the span, and on a configuration with a 5-to-1 taper over the outboard 20 percent of the blade span. The investigation covered a range of thrust coefficients from 0 to 0.0075 and a range of tip speeds from 300 to 600 ft/sec. The test showed that both tapered configurations had better performance than the swept-tip rectangular configuration and that the 3-to-1 taper configuration was better than the 5-to-1 taper configuration. The test results were compared with predictions made with a prescribed-wake analysis, a momentum analysis, and a simplified free-wake analysis. Keywords: Helicopter rotor blades; Rotor hover performance, and Tapered rotor blades.

Download or read book NASA Conference Publication written by and published by . This book was released on 1988 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: