Results 291 to 300 of about 7,767,476 (330)

Design Study of Expendable Main Rotor Blades

1972
Abstract : A design study is performed to determine the feasibility and cost advantages of expendable main rotor blades designed for the UH-1H helicopter. Technical feasibility, manufacturing cost, reliability, maintainability, and life-cycle costs were determined.
Carroll R. Akeley, Paul F. Maloney, Michael C. Frengley   +2 more
openaire   +1 more source

The Bearingless Main Rotor

Journal of the American Helicopter Society, 1980
Peter G. C. Dixon, Harold E. Bishop
openaire   +1 more source

Effect of rotor blade tip shape on helicopter main-rotor performance

2021
EFFECT OF ROTOR BLADE TIP SHAPE ON HELICOTER MAIN-ROTOR PERFORMANCE SUMMARY A helicopter is an aircraft that uses rotating wings to provide lift, propulsion, and control. The rotary wings can produce aerodynamics forces, which are generated by the relative motion of a wing surface with respect to the air, even when the velocity of the vehicle itself is
openaire   +1 more source

The Effect of Helicopter Main Rotor Blade Damage on the Rotor Disk (Whole Rotor) Motion

2000
Abstract : When a helicopter main rotor blade is ballistically damaged, an imbalance is created in the rotor, causing the rotor disk to execute unwanted motions, which are detrimental to performance. The normally smooth-flying helicopter develops new vibrations that can be physiologically annoying or debilitating to the pilot, can exceed structural ...
openaire   +1 more source

Helicopter Main Rotor Transmission Output Shaft Failure

2019
Abstract A helicopter had just taken off when there was a loud bang and the engine started to overspeed. After landing and inspection, the transmission was disassembled. It was discovered that the assembly containing the output shaft to the main rotor had failed.
openaire   +1 more source

Monitoring the Dynamics of a Helicopter Main Rotor With High-Speed Stereophotogrammetry

Experimental techniques (Westport, Conn.), 2016
T. Lundstrom, J. Baqersad, C. Niezrecki
semanticscholar   +2 more sources

Failure of a Helicopter Main Rotor Blade

1992
Abstract A Marine Corps helicopter crash was investigated. Efforts were directed to the failure of one of the main rotor blades that had apparently separated in the air. The apparent failure of a blade integrity monitor (BIM) system was also considered.
openaire   +1 more source

Helicopter Main Rotor Blade Root End under High Velocity Bird Impact

, 2018
D. Naik, R. Kumar
semanticscholar   +1 more source

Rotor Position Estimation Based on Low-Frequency Signal Injection and Estimated Main Field Current for Wound-Field Synchronous Starter/Generator in the Low-Speed Region

IEEE Transactions on Power Electronics, 2023
Xiaoke Zhang, Ningfei Jiao, Shuai Mao
exaly  

Design and Optimisation of Main Rotor for Ultralight Helicopter

, 2017
W. Stalewski
semanticscholar   +1 more source