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90 Wake skew angle of attack average interference velocity calculated correction factors closed on bottom closed tunnel Closed wind tunnel computing cos2 cos3 diameter to tunnel effect of angle Effective wake skew Elliptic loading equation 19b equation 27 ference velocities Figure 12.—Continued flight conditions free air free boundaries front rotor ft/sec vertical induced ground effect Harry H Heyson horizontal doublets identical image wake jet-boundary Langley Field lift coefficient low skew angles low speeds NACA Rep nondimensionalizing radians rate of climb ratio of rotor rear rotor RECTANGULAR WIND TUNNELS rection rotor diameter rotor disk rotor wake shown in figure single rotor small rotor SOLID LOWER BOUNDARY tandem rotors terms of equation tunnel floor tunnel width Uniform loading vertical induced velocity vortex rings wake deflection wake of horizontal wake of vertical wake skew angle Wind tunnel closed wind-tunnel center line wind-tunnel floor wind-tunnel jet-boundary-correction factor wind-tunnel width-height ratio zero