Propeller characteristics refer to the relationship curve between propeller torque, power and rotational speed, that is, M=f(n), P=f(n) curves. The most commonly used are the following three typical characteristic curves: (1) Free navigation characteristics My=f(n), Py=f(n); (2) Mooring characteristics or anchoring characteristics Mz=f(n), Pz=f(n); (3) …