both subcavitating and supercavitating propellers; took a leading part in developing the machinery plants for the SS United States and many merchant ships; and made and guided extensive design studies of gas turbine propulsion machinery for many ships, including the GTS John Sargent, HS Victoria, and several combatant types for the U.S. and Canadian navies.

Elected to the National Academy of Engineering in 1967, Bachman served on the National Research Council's Committee on Ocean Engineering and was chairman of its Panel on Commerce and Transportation. A licensed professional engineer, he was a fellow of the American Society of Mechanical Engineers and served on many of its technical committees. He was a member of the American Society of Naval Engineers, National Society of Professional Engineers, and the Engineering Committee of the American Bureau of Shipping. Also a member of the Society of Naval Architects and Marine Engineers, he was an active participant in that society's technical and research program, serving as chairman of its Committee for Hydrodynamic Research and as a member of its Technical and Research Steering Committee. Bachman also served as a member of the Mechanical Engineering Advisory Committee of Norwich University.

The late William Francis Gibbs earlier recalled his association with Bachman. "The results of the work of this firm, as shown in the design of ships for the national defense, in vast numbers of cargo ships and passenger ships such as the SS United States, indicate better than I could describe the senior part that Mr. Bachman has played in the performance of the firm. It is the opinion of many that he is easily the best and foremost marine engineer in the world today. If modesty be a fault, he can plead guilty."

Bachman is survived by his son, Van Cleaf Bachman of Lunenberg, Nova Scotia; a daughter, Elizabeth Ramjoué of Oberhaching, Germany; six grandchildren; and three great-grandchildren.

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