Power Estimation

Using the resistance estimation and propulsion factors previously derived, the propeller characteristic is interpolated at each speed using the appropriate value of KT/J2. This therefore provides the appropriate advance coefficient and open water efficiency at each speed from which the propeller rpm and the delivered power for each ship speed are then obtained from the following process:

where:

Note:
If you enter a value of 1.0 for the transmission efficiency, then the shaft power in the output is effectively only delivered power and is printed in the output as such.