The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . Fig. I,Ressel — 18 Fig. — improved. case of the screw propeller, the difference be-tween the distance travelled by the screw in afluid, and the interval of its advance in a solidmedium is known as the apparent slip: whilethe backward velocity of the water immediatelyacted upon by the screw, is called the realslip. Both of these results are consequencesnecessitated by the working of a screw in a SCREW PROPELLER fluid medium, and may u
The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . Fig. I,Ressel — 18 Fig. — improved. case of the screw propeller, the difference be-tween the distance travelled by the screw in afluid, and the interval of its advance in a solidmedium is known as the apparent slip: whilethe backward velocity of the water immediatelyacted upon by the screw, is called the realslip. Both of these results are consequencesnecessitated by the working of a screw in a SCREW PROPELLER fluid medium, and may under certain circum-stances vary considerably from each other. Real v + f—sslip may be expressed by the formula , V in which (v) represents the speed of the screw,(s) the speed of the vessel, and (/) the velocityof the forward motion of the water followingin the wake of the vessel. The factor (/), be-ing due to the frictional resistance of the vessel,depends so much upon the shape of its hull,that it is not susceptible of accurate determi-nation, so that in considering the loss of applied. Fic. s,Hirsch — 186a. Fic. — i86s
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