Figure 12 Comparison of power coefficient with tip speed ratio for number of blade=7, at different pitch angle.
While minimum value of power coefficient was obtained 0.02,
at operating pitch angle ranging from -3 degree and -5 degree,
corresponding tip speed ratio=8.
It is noted from Figure 12 when pitch angle=3, value of power coefficient was obtained 0.48,
while pitch angle=-5 degree value of power coefficient was obtained only 0.3,
therefore it justifies that the pitch angle strongly affects power coefficient.
Hence, proper selection of pitch angle is very important as it can improve rotor design performance.