105 Cup, 4-Blade, LH Rotation All Acme propellers are engineered, manufactured, inspected and shipped directly from Acme's U. Through this process, Acme can "dial-in" to make incremental changes in any or all of these elements, which enables the development of an optimum propeller for each specific make and model of boat. Propeller 14 x 14.Boats using Acme Propellers are discovering their true performance potential - directly out of an Acme box.