Download or read book OH 58A Autorotational Evaluation written by Joseph C. Watts and published by . This book was released on 1972 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several recent instances of tail-boom buckling have occurred after an autorotational touchdown in the OH-58A helicopter. These occurrences prompted the US Army Aviation System Command (AVSCOM) light observation helicopter (LOH) Project Manager to enter into a product improvement program (PIP) with Bell Helicopter Company (BHC) to define the problem and recommend a solution. This PIP task included computer studies, a shake test, and flight testing of a structurally instrumented OH-58A helicopter. The results of the PIP task, to date, indicate that the tail-boom buckling resulted from a resonant condition between the main rotor and the natural frequencies of the fore and aft pylon mode and the tail boom. This resonant frequency, 5 hertz, was likely to occur at high blade angles (100-percent collective) and low rotor speed (150 rpm) and was associated with large main rotor flapping excursions. Three solutions were considered: (1) change the natural frequencies of the fore and aft pylon mode and/or tail boom, (2) damp the pylon movement, and (3) eliminate the excessive blade flapping. The BHC chose the third solution by electing to restrict the maximum collective control travel which would, in turn, eliminate excessive flapping at low rotor speeds. The BHC testing showed that there was no degradation of helicopter performance as the result of the installation of an 80-percent collective pitch restriction device.

Download or read book Flight Test Evaluation of OH 58A Tailboom Failure During Autorotation Landings written by Thomas L. Sanders and published by . This book was released on 1973 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: A flight program was initiated in September 1971 to investigate the causes of the model OH-58A tailboom failures occurring in service and to explore methods of eliminating this type of failure. From the results of this test it is concluded that the tailboom failures would not have occurred had proper autorotative techniques been observed.

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 Product Improvement Test of OH 58A Helicopter Cold Weather Test written by Jack D. Hill and published by . This book was released on 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Product improvement Test of OH 58A Helicopter Cold Weather Test written by Richard J. Followill and published by . This book was released on 1971 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Research development test and evaluation written by United States. Congress. House. Committee on Armed Services and published by . This book was released on 1983 with total page 1404 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1977-04-29 with total page 256 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 1978 with total page 932 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.

Download or read book Defense Department Authorization and Oversight Research development test and evaluation written by United States. Congress. House. Committee on Armed Services and published by . This book was released on 1983 with total page 1404 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Defense Department Authorization and Oversight Research development test and evaluation April 12 18 19 20 22 25 26 27 and 28 1983 written by United States. Congress. House. Committee on Armed Services and published by . This book was released on 1983 with total page 1404 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aeronautical Engineering written by and published by . This book was released on 1990 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).

Download or read book Technical Abstract Bulletin written by and published by . This book was released on 1979 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Annual Department of Defense Bibliography of Logistics Studies and Related Documents written by United States. Defense Logistics Studies Information Exchange and published by . This book was released on 1977 with total page 1200 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Flight Regulations written by United States. Department of the Army and published by . This book was released on 1997 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Journal of the American Helicopter Society written by American Helicopter Society and published by . This book was released on 1983 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book OH 58A Flat Rate Manual written by and published by . This book was released on 1976 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this Flat Rate Manual is to provide statistical man- hour parameters for the performance of tasks involved at the Organizational, Direct, and General maintenance levels for the Oh-58A aircraft. It is intended for evaluating and predicting maintenance requirements and/or comparing the performance of an activity against a recognized standard. (Author).

Download or read book Proceedings of the 1980 Army Science Conference Principal authors A through D written by and published by . This book was released on 1980 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: