The S-42 Class coastal submarine torpedo boat was 225 feet 3 inches in length overall; had an extreme beam of 20 feet 8 inches; had a normal surface displacement of 906 tons, and, when in that condition, had a mean draft of 16 feet. Submerged displacement was 1,126 tons. The hulls were riveted. The designed compliment was four officers and thirty-four enlisted men. The boat could operate safely to a depth of 200 feet.
The submarine was armed with four 21-inch torpedo tubes...installed in the bow. Twelve torpedoes were carried. One 4-inch/50 caliber deck gun was installed.
The full load of diesel oil carried was 46,363 gallons, which fueled two 600 designed brake horsepower Model 8-EB-15NR diesel engines manufactured by the New London Ship and Engine Company at Groton, Connecticut which could drive the boat via a diesel direct drive propulsion system at 14.5 knots on the surface.
Power for submerged propulsion was provided by a main storage battery, divided into two sixty-cell batteries, manufactured by the Electric Storage Battery Company (EXIDE) at Philadelphia, Pennsylvania which powered two 750 BHP main propulsion motors manufactured by the Electro Dynamic Company at Bayonne, New Jersey which turned propeller shafts which could drive the submarine at 11 knots for a short period of time when operating beneath the surface of the sea. Slower submerged speeds resulted in greater endurances before the batteries needed to be recharged by the engines and generators.
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