Dear Jason,
I have some doubts about thrust of NREL 5MW given in this article [Definition-of-a-5-MW-reference-wind-turbine-for-offshore-system-development](Figure 9-1. Steady-state responses as a function of wind speed).
I used ORIGIN to obtain the data of RotThrust vs wind speed, and then it was easy to get the CT(coefficient of thrust, the black line) with the formula(air density=1.225, Ad=3.1415*63^2)
At the same time, I used FAST to calculate Ct in different average wind speed ranged from 3-25 m/s(the red line).
The strange things is that those 2 line has huge difference. Why has this happened? Is it normal Ct is as high as 2.5?
Best regards,
Chenxu.Zhao
