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00 i i i i 6ap mnuiLze American Helicopter Soc ao^oy apparent time-dependent veloc autocovariance function AVRADCOM beam calculations cross-beam angle described in reference discrete-frequency fast Fourier transform flow field frequency fuselage width H/A iZ'O Helicopter Rotor histogram horizontal I I I I I I I I I I I I I I I I I I I I I I I l l IIII1IIII investigation JO^oy Langley Research Center LV data LV measurements LV sample m/sec measurement location NASA oaS/w optics panux^uoo particle percent periodic turbulence poL9A poLaA 00 Power spectral density presented in figure probability density function quantizing error random rotor azimuth rotor blades rotor wake velocity rotor-fuselage spacing S S 0 S0 sample volume solid angle Spectral transformation time-averaged time-dependent velocity characteristics to^oy uo^oy velocity components velocity fluctuation velocity measurements obtained velocity time history vertical wavelength