NASA NTRS · 19960033297
Rotorcraft Blade-Vortex Interaction Controller
Abstract
Blade-vortex interaction noises, sometimes referred to as 'blade slap', are avoided by increasing the absolute value of inflow to the rotor system of a rotorcraft. This is accomplished by creating a drag force which causes the angle of the tip-path plane of the rotor system to become more negative or more positive.
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Schmitz, Fredric H.. 1995-12-26. Rotorcraft Blade-Vortex Interaction Controller. https://ntrs.nasa.gov/citations/19960033297
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