 Dravo Brothers also built Destroyer Escorts for the Battle of the Atlantic and many of the tugboats used in American harbors.The Packard V-12, a product of the Packard Motor Company that was co-founded by James Ward Packard (Lehigh Class of 1884), was one of the most powerful inline aircraft engines ever manufactured.The 4M-2500 version produced and was essential to the success of US Navy PT Boats in World War II, which were each powered by three of them.