C-5 was a hydrogen-filled C class blimp operated by the U.S. Navy in 1918 and 1919. It was part of a 10-blimp series built by Goodyear and Goodrich and was intended to capitalize upon the navy's experience operating blimps during World War I. The C-5's engines were built by Hispano-Suiza, and its control car was built by Curtiss Aeroplane and Motor Company. In early May 1919, the C-5 made a pioneering flight from its home base at Cape May, New Jersey to Montauk Point, New York and St. John's, Newfoundland, becoming the first airship to reach that city and in the process sending the first radio voice transmission from Newfoundland. The C-5's goal was to fly across the Atlantic, paralleling the route used by the U.S. seaplane NC-4. Previous attempts to cross the Atlantic Ocean in a balloon w