A previous report by H.F. Nordstrom gives comprehensive information about the hull forms and resistances of a considerable number of round-bottom boats. This earlier report also shows that the resistance of these craft is determined mainly by the value of the hull form parameter,
. Data on round-bottom boats from a number of other sources were examined to see if they could be correlated with the Nordstrom data. It was hoped thereby to produce graphs which would be useful for the prediction of boat performance for a wider range of speeds. A report by Marwood and Silverleaf was found to contain data which could be used to prepare a series of graphs useful for predicting the resistances of boats of a wide range of sizes up to quite high speeds. The data from the other sources examined was found to be of little value for the present purpose. Generally this was either because of the evident presence of liminar flow on the models, or because the models were fitted with skegs of unknown size and of unknown influence on the resistance.
