are four-bladed, at a maximum the amount of power necessary to sink the boat. propelling the boat. It was designed with this boat speed of 300 revolutions per minute. This rate of revo- When the desired depth is attained, then the propeller to attach torpedoes to the bottom of a vessel, then run… … sistance, itxe cause of the positive pole wearing awajl wheels, one on either side, connected with one shaft twice as fast as the negative is due to this difference in amidships. To the ends of the shaft are attached temperature. gear wheals, working in the gear attached to propellers, THE TUCK…
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