The propeller silent.It is provided with a propeller silent (1) including a blade of propeller with this angle of step is not his portion of the base.However, in its portion of the blade and the edge with respect to a flow on the rotational direction, so as to raise the internal pressure of a liquid in the same to eliminate a cavity.An air bubble or a cavitation in the portion of base of the blade at the time of a high-speed rotation.So that the propeller is rotated at a high speed by a small main engine and a main motor capable of moving the fluid behind; in the quiet propeller (1),A blade of the propeller (3) is bent back at its portion of the conductor to form a portion of the slope 3 (d),And a portion of the end of rotational front side (3a) in the portion of the slope (3D) is formed in a curved shape in side view.While a portion of the edge of the rear rotational (3b) is then gradualmenre extended backward from the front end portion of the rotational (3a) to become aStraight from the base of the blade to the tip of the blade, thereby to form a face of slope deflection (3e); at the time of rotation.The fluid is pushed in the direction of the rear axle from the face of slope deflection (3e) in the portion of the slope.
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