Rotating cylinders were proposed as a means of ship propulsion in 1924 by the German engineer, Flettner. The original Flettner rotor ship had two rotors, each about \(10 \mathrm{ft}\) in diameter and \(50 \mathrm{ft}\) high, rotating at up to \(800 \mathrm{rpm}\). Calculate the maximum lift and drag forces that act on each rotor in a \(30-\mathrm{mph}\) wind. Compare the total force to that produced at the optimum \(L / D\) at the same wind speed. Estimate the power needed to spin the rotor at \(800 \mathrm{rpm}\).