• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 111
  • 110
  • 6
  • 4
  • 4
  • 4
  • 4
  • 4
  • 4
  • 3
  • 3
  • 2
  • 2
  • 1
  • Tagged with
  • 290
  • 142
  • 106
  • 50
  • 34
  • 31
  • 28
  • 27
  • 26
  • 26
  • 23
  • 22
  • 21
  • 21
  • 20
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Effect of a ground plane on the induced power required by a hovering helicopter

Kural, Marat Huseyin 08 1900 (has links)
No description available.
2

Helicopter performance instrumentation system /

Hardy, Michael L. Unknown Date (has links)
The civil helicopter accident rate in the USA is 10 times that of airline accidents, with 20% attributed to pilot error. US Army/NASA studies have developed a number of strategies with the goal of reducing the helicopter accident rate. These include human centred cockpit technology to provide real time performance prediction and operational limits alerting systems. These were seen as practical recommendations to help reduce the significant number of accidents where performance limitations were exceeded, particularly for rotorcraft pilots subject to high workload. / The two typical methods in use for pilots to predict helicopter performance and pre-determine limits are through the use of performance data in the Rotorcraft Flight Manual (RFM) and Flight Management Systems (FMS). Using the RFM performance data is extremely difficult in a single-pilot environment, particularly in lower cost helicopters that have weak stability and unfavourable flight control characteristics. The FMS in several modern helicopter types provide some means of performance prediction but are limited in their capability, are aircraft-type specific and not certified for use in other helicopters. / This thesis describes the design and test of a low-cost, automated, helicopter performance instrumentation system that conducts real-time performance predictions and limits alerting for the Bell OH-58C helicopter. / The prototype helicopter performance instrumentation system demonstrated very good potential to conduct accurate performance predictions, while significantly reducing pilot workload. It allowed a limited demonstration of performance limits alerting that could warn a pilot of inadequate performance available. The reduction in workload, accuracy and performance limits alerting features of the COTS-based helicopter performance instrumentation system enable it to have potential to assist in reducing the high accident rate in lower-cost production helicopters. Further research into the system is recommended to develop enhancements using intelligent techniques. / Thesis (MSc(AppliedPhysics))--University of South Australia, 2007.
3

Application of neural networks to indirect monitoring of helicopter loads from flight variables /

Cook, Allan B., January 1991 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1991. / Vita. Abstract. Includes bibliographical references (leaves 85-86). Also available via the Internet.
4

A study of helicopter aerodynamics in ground effect

Pulla, Devi Prasad, January 2006 (has links)
Thesis (Ph. D.)--Ohio State University, 2006. / Title from first page of PDF file. Includes bibliographical references (p. 195-197).
5

Analysis of consolidation of intermediate level maintenance for Atlantic Fleet T700-GE-401 engines

Cook, Jeffrey S. January 1992 (has links)
Thesis (M.S. in Management)--Naval Postgraduate School, June 1992. / Thesis Advisor: Kang, Keebom. "June 1992." Includes bibliographical references (p. 89-90). Also available in print.
6

Enhanced energy maneuverability for attack helicopters using continuous, variable rotor speed control /

Schaefer, Carl George. January 1990 (has links)
Project report (M. Eng.)--Virginia Polytechnic Institute and State University, 1990. / Includes bibliographical references (leaves 144-148). Also available via the Internet.
7

Development of a low-cost, low-weight flight control system for an electrically powered model helicopter /

Carstens, Nicol. January 2005 (has links)
Thesis (MScIng)--University of Stellenbosch, 2005. / Bibliography. Also available via the Internet.
8

Investigation of increased forward flight velocities of helicopters using second harmonic control and reverse velocity rotor concept /

Van Riper, Steven G. January 2003 (has links) (PDF)
Thesis (M.S. in Aeronautical Engineering)--Naval Postgraduate School, December 2003. / Thesis advisor(s): E. Roberts Wood, Raymond Shreeve. Includes bibliographical references (p. 145-146). Also available online.
9

A method for estimating performance of single rotor helicopters

Stevens, Story Crandall 12 1900 (has links)
No description available.
10

Jet thrust as a counter-torque force for single-rotor, shaft-powered helicopters

McDaniel, Robert Lee 08 1900 (has links)
No description available.

Page generated in 0.06 seconds