Abstract: Each blade includes at its root a root portion that slides axially into a re-entrant cavity that extends axially in the hub. End caps prevent axial removal of the blade roots from the hub. Thus, it is possible to replace an individual damaged blade, and the hubs are interchangeable from ship to ship, although the blades may vary slightly. All of the parts are injection molded of a high-strength fiber-reinforced plastic. The entire assembly can be produced at approximately half the cost of conventional metal propellers. The propeller is intended for use with engines developing 90-250 HP, and the diameter of the propeller is 16-18 inches. The various parts includes apertures and passages so as not to interfere with the discharge of exhaust gases.