A five metre tall, 1 m diameter Flettner rotor mounted on asmall cargo vessel, spins at 50 rpm in a steady beam breeze of 15knots. What is the thrust generated by the rotor? The air densityand viscosity may be assumed constant at 1.22 kg/m3 and 1.79 x 10â€5Pa.s respectively. Note also that 1 knot = 0.514 m/s.  Which direction must the rotor spin to produce forward thrust?
