1. Rotor radius, R Number of rotors Blades per rotor Rotor separation Blade tip chord Blade taper ratio Blade twist (nonlinear) Solidity, a Referencesrea, S Blade precone angle Blade prelag angle Shaft tilt 5.5 m 2 3 0.76 m 0.29 m 2:1 -10 deg 0.13 12.0 m2 3 deg 1.4 deg