This report presents the results of an analysis data for 1,485 models of single-screw ocean-going ships run at St. Albans and Teddington, in the form of charts of © for a ship of standard dimensions 400-ft BP x 55 ft moulded breadth x 24-ft moulded draught, for a series of speeds and a range of block coefficient from 0.53 to 0.88. From these charts standards of average and optimum resistance performance, as at April 1969, have been determined.

The 1969 average and optimum standards have been compared with three other standards; the best © for tankers and bulk carriers attainable at St. Albans January 1965, and the 1969 cross fairing of resistance of some new B.S.R.A. forms with and without bulbous bows.

It is concluded that for most practical combinations of block coefficient and speed-length ratio the B.S.R.A. series forms have a resistance performance which lies between the average and optimum.