The 1978 ITTC PERFORMANCE Prediction Method is the method developed to predict the rate of propeller revolutions and delivered power of a single screw ship from the model test results. The viscous and the residuary resistance of the ship are calculated from the model resistance tests assuming the form factor to be independent of scale and speed. The ITTC standard predictions of rate revolutions and delivered power are obtained from full-scale propeller characteristics determined by correcting the model values for drag scale effects. The original 1978 method was modified in 1984 and 1987 for a better and more convenient use of the program.
Further reading: ITTC – Recommended Procedure 7.5-02-03-01.4.