Main power was generated by two Westinghouse 10,200 kilowatt turbine generator sets that normally each drove two 400 volt Westinghouse 13,200 horsepower synchronous motors directly connected to the two screws. In the President Coolidge twelve Babcock & Wilcox superheater type water tube boilers provided steam for main and auxiliary power. Westinghouse built the turbo generators and propulsion motors for President Coolidge but General Electric built the turbo generators and propulsion motors for President Hoover. Each ship had turbo-electric transmission, with a pair of steam turbo generators generating current that powered propulsion motors on the propeller shafts. They were the largest merchant ships built in the United States up to that time. The keel for President Coolidge was laid 22 April 1930 and the ship was delivered 1 October 1931. The Newport News Shipbuilding and Drydock Company of Newport News, Virginia built the two ships, completing President Hoover in 1930. President Coolidge had a sister ship, SS President Hoover, completed in 1930 and lost when she ran aground in a typhoon in 1937.ĭollar Lines ordered both ships on 26 October 1929. She served as a troopship from December 1941 until October 1942, when she was sunk by mines in Espiritu Santo in the New Hebrides at the Espiritu Santo Naval Base, part of current-day Vanuatu. She was operated by Dollar Steamship Lines until 1938, and then by American President Lines until 1941. SS President Coolidge was an American luxury ocean liner that was completed in 1931. San Francisco – Kobe – Shanghai – Manila
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