An experimental investigation of the aeromechanical stability of a hingeless rotor in hover and forward flight [PDF]
Analysis and testing were conducted in the Langley Transonic Dynamics Tunnel to investigate the aeromechanical stability of a soft inplane hingeless rotor model.
Hamouda, M-Nabil H. +2 more
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Redesigned rotor for a highly loaded, 1800 ft/sec tip speed compressor fan stage 1: Aerodynamic and mechanical design [PDF]
A highly loaded, high tip-speed fan rotor was designed with multiple-circular-arc airfoil sections as a replacement for a marginally successful rotor which had precompression airfoil sections. The substitution of airfoil sections was the only aerodynamic
Halle, J. E., Ruschak, J. T.
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A Case of Penetrating Head Wound Due to Helicopter Rotor Blade Injury in a 34-Year-Old Naval Helicopter Pilot Who Returned to Active Service 5 Years Later. [PDF]
Am J Case Rep, 2021 Hsieh CC +6 more
europepmc +1 more source
Helicopter rotor wake geometry and its influence in forward flight. Volume 1: Generalized wake geometry and wake effect on rotor airloads and performance [PDF]
An analytic investigation to generalize wake geometry of a helicopter rotor in steady level forward flight and to demonstrate the influence of wake deformation in the prediction of rotor airloads and performance is described.
Egolf, T. A., Landgrebe, A. J.
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, 2016 A Reynolds averaged Navier Stokes (RANS) model has been compared with laboratory scale measurements of the loading and wake of arrays of horizontal axis three-bladed rotors.
A. Olczak +3 more
semanticscholar +1 more source
Application of a system modification technique to dynamic tuning of a spinning rotor blade [PDF]
An important consideration in the development of modern helicopters is the vibratory response of the main rotor blade. One way to minimize vibration levels is to ensure that natural frequencies of the spinning main rotor blade are well removed from ...
Spain, C. V.
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An experimental study of the sensitivity of helicopter rotor blade tracking to root pitch adjustment in hover [PDF]
The sensitivity of blade tracking in hover to variations in root pitch was examined for two rotor configurations. Tests were conducted using a four bladed articulated rotor mounted on the NASA-Army aeroelastic rotor experimental system (ARES).
Langston, Chester W. +5 more
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Advancing-side directivity and retreating-side interactions of model rotor blade-vortex interaction noise [PDF]
Acoustic data are presented from a 40 percent scale model of the four-bladed BO-105 helicopter main rotor, tested in a large aerodynamic wind tunnel.
Elliott, J. W. +3 more
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Аграрная наука Евро-Северо-ВостокаThe purpose of the research is to substantiate the critical rotation speed of a rotor with bent blades based on force analysis and modeling the movement of mixture particles in a horizontal loader of a circulation mixer.
T. M. Kovaleva +3 more
doaj +1 more source
A flight investigation of blade section aerodynamics for a helicopter main rotor having NLR-1T airfoil sections [PDF]
A flight investigation was conducted using a teetering-rotor AH-1G helicopter to obtain data on the aerodynamic behavior of main-rotor blades with the NLR-1T blade section.
Morris, C. E. K., Jr. +2 more
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