Propeller overload factors for the direct power method

摘要

The new guidelines for speed-power sea trials data analysis apply the direct power method to correct the measured data. This method requires propeller overload factors which ideally are determined by self-propulsion tests performed by the propeller load varying method, aka British method. The less laborious method of propeller constant loading method (aka Continental method) is largely used for self-propulsion basin tests even though it cannot directly produce the propeller overload factors required by the new standards. STAIMO freeware, released by STA Group applies these new regulations and has been, widely adopted by the marine industry in recent years. Default values of propeller overload factors are suggested in that software which ignores the particularity of the subject ship.