In 1907 the government sent out a RFP for a new gasoline generator design for use in seacoast forts. GE responded to the proposal with a price that was 10% less than the single other bidder and won the contract to develop what would become the model GM-12. This 25 kw. set consists of a four-cycle, four-cylinder, vertical gasoline engine driving a directly coupled 115-volt DC generator in the version acquired by Ft. MacArthur and as seen in the video. The engine has a maximum capacity of 54 hp at a speed of 560 rpm The net, continuous duty output of the set is 25 kw. The cylinder bore and stroke dimensions are 7.25 and 7.5 inches respectively. Both the engine and radiator assembly (not seen in the video) were designed to pass through 3-foot doorways and a 7-foot ceiling is required to allow removal of the cylinder assemblies, the dimensions found in typical seacoast emplacements.
Keywords: history, motor, generator, GM-12, WW1, museum, Fort, macarthur, coast, artillery, electrical
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