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Coffyn remained at Palm Beach until April when the school was closed and he returned to Marblehead. He was kept busy during the summer months flight testing two new planes, first a pusher biplane flying boat for the Navy, using an 8-cylinder, 70 h.p. Renault engine, then later a special pusher biplane flying a boat for Robert Collier, using a 220 h.p., 20 cylinder, air-cooled Anzani engine. In addition to this he tested some military planes built and delivered that season. In early October Collier’s flying boat was delivered to him at Seidlers Beach on Raritan Bay, New Jersey, and Coffyn was sent there to fly it for him, remaining until the plane was put up for the winter on December 23rd. 
   During the winter months Coffyn designed and supervised the construction of a shallow draft, air-propelled boat for Collier, called the “Aero-Skimmer.” In the spring of 1914 he reportedly assisted in the early development of the first Burgess-Dunne hydroalkaplanes, and in June the Burgess Company established a New York office at 331 Madison Avenue with Coffyn in charge. At the same time he also set up his own consulting business and later became a free lance test pilot until the beginning of World War I on April 6, 1917. 
   After the war Coffyn went to Great Britain on business relating to the automobile industry. During 1920-1922 he was int he wholesale cotton business in Port au Prince, Haiti, then moved to California where he was in the movie and real estate business until 1929 when he made an aerial survey for a mining company in Mexico. In late 1929-1930 he was an aviation consultant for General Development Corporation, Hartford, Connecticut. In 1931 he was in charge of the Aviation 
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