A large Darrieus vertical axis wind turbine was built by the U.S. Department of Energy near Sandia, New Mexico [48]. This machine is \(18 \mathrm{~m}\) tall and has a \(5-\mathrm{m}\) radius; the area swept by the rotor is over \(110 \mathrm{~m}^{2}\). If the rotor is constrained to rotate at \(70 \mathrm{rpm}\), plot the power this wind turbine can produce in kilowatts for wind speeds between 5 and 50 knots.