Results 191 to 200 of about 15,084 (235)

Vibratory Ice Protection for Helicopter Rotor Blades.

1978
Abstract : This report presents the results of a study on vibrational deicing of main and tail rotor blades through higher harmonic shaking of the blades with aerodynamic, mechanical, and hydraulic shakers. Studies were made of various locations for mounting shakers, the forces and frequencies to deice, types of shakers, concept effectiveness, energy ...
H. Upton, H. E. Lemont
openaire   +1 more source

Active rotor control for helicopters: individual blade control and swashplateless rotor designs

CEAS Aeronautical Journal, 2011
Modern helicopters still suffer from many problems that hinder a further increase in their efficiency, acceptance and hence their market share. The high level of vibrations and the noise generated by the rotor are the most important reasons for this. Vibrations are problematic not only for pilot and passenger comfort, but also give rise to an increase ...
openaire   +3 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

Design and Production of Fiberglass Helicopter Rotor Blades

1980
The design of a helicopter rotor blade requires close attention to aerodynamic, dynamic, structural and mechanical considerations, and manufacturing methodology.
C. E. Covington, P. S. Baumgardner
openaire   +1 more source

Mechanical Stability of a Two-Bladed Cantilever Helicopter Rotor

Journal of the Aeronautical Sciences, 1956
SUMMARY A theoretical analysis of the mechanical stability of a twobladed cantilever helicopter rotor, whose hub is mounted upon isotropic elastic supports in the horizontal plane and whose elastic blades employ fixed root attachments, has been made and is reported here.
openaire   +2 more sources

Solutions for Helicopter Rotor Blade Icing

Journal of the American Helicopter Society, 1958
D. A. Richardson, H. A. Wahl, J. M. Clifford   +2 more
openaire   +1 more source

The Single-Rotor Helicopter with Rigidly-Mounted Blades

The Journal of the Royal Aeronautical Society, 1963
For many years, studies of various light aircraft designs have been carried on by the Lockheed-California Company in search of a vehicle that had the potential of truly generating the “air age”—a vehicle which would perform a useful service to many people, in many jobs.
openaire   +1 more source

The Heavy Lift Helicopter Rotor Blade

Journal of the American Helicopter Society, 1974
T. Scarpati, R. Sandford, R. Powell
openaire   +1 more source

Stabilizing helicopter rotor blades using delayed feedback

2021
J.M. Krodkiewski, J.S. Faragher
openaire   +1 more source

Modulating crystal growth of formamidinium–caesium perovskites for over 200 cm2 photovoltaic sub-modules

Nature Energy, 2022
Tongle Bu, Luis K Ono, Jie Su
exaly