When a marine propeller is designed, the weight, moment of inertia and strength of blade of the propeller etc. should be calculated. These calculations, in practice, are very complicated, because the method of graphical integration is used as a usual process of calculation. At the stage of initial design, the basic particulars of a propeller are often required to be determined in a short time. For this reason, many empirical formulae have been presented, but few formulae are satisfactory for any type of propellers. The author calculated the above-mentioned quantities of propellers for many particulars which are varied systematically, by using a high speed digital computer "IBM 7090", and obtained new approximate formulae with sufficient.accuracy.
