= "».• " "»/«o« iracber of helical vortex filaments used to approximate the vortex sheet In hovering flight •a-»«" manber of vortex filaments approximating vortex sheet in forward flight analysis radius of helical tip vortex, ft. radial distance from helix axis of any point at vhich the Induced velocities are desired, ft. radial position of vortex filaments as defined by eq. A-53> ft. radius of point (X/yO on helix from wake axis (^-axis), ft. radius of r^tor, ft. pop-d 1 mensional induced velocities associated with tip vortex non-dimensional induced velocities associated with vortex sheet in forwari flight time, measured from »o , sec. time required for wake to reach steady configuration, sec. rotor thrust, lbs. rtdial velocity component associated with vortex sheet in forward flight, ft/sec. radial induced velocity associated with lifting line, ft/sec. radial induced velocity associated with tip vortex, ft/eec. \uan*m T ~ " "-wij<..i...wt».-^A-JJU»^ ■ ."■ ■ * i^g.rf ^c' i'ii' 1 n ii 1 i>iiiiyrigiBrjiwiij'ii3tii'i
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