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revolving on a [[strikethrough]] drum [[/strikethrough]] circular band around the fuselage just back of the wings. Seats were underwing and in tandem forward. [[strikethrough]]and[[/strikethrough]]The plane could be flown on either engine [[strikethrough]]single[[/strikethrough]] or both.[[strikethrough]]at will in flight[[/strikethrough]] The United States Navy bought four of [[strikethrough]] these planes[[/strikethrough]]them. During this period the well known test pilot, Dave McCulloch, also did some test flying for the company on these planes. 

Later in 1917-1918 a larger edition of this plane, designated the D-4, was built, using two liberty engines. Gallaudet was granted a U. S. Patent on the very novel geared-propeller drive [[strikethrough]]arrangement[[/strikethrough]] used on these planes. It had the advantage of a large, geared-down, highly efficient propeller, low head resistance, and [[strikethrough]]the arrangement[[/strikethrough]] afforded excellent visibility. In 1917 the company operated a flying school and taught many World War-I pilots. Instructors were Phil Radar, Jack McGee and Fred Eden. At this time the company was reorganized and became the Gallaudet Aircraft Corporation, with the factory at East Greenwich, R.I. and New York offices at 1328 Broadway. They advertised "Biplanes - Honoplanes, Seaplanes and Flying Boats." In 1918 the company bult a number of HS-2 Flying Boats for the United States Navy. Following World War I the corporation completed existing Government contracts and continues to promote air transport in general. 

In March, 1919 the company displayed their latest military-type D-1, together with a very novel small side-by-side two-seater sport plane called the "Chummy Flyabout", at the Aeronautical Exposition [[strikethrough]]at[[/strikethrough]] Grand Central Palace, New York. The Gallaudet flying school was also continued for a time. In 1921 a Government development contract for an airship engine nacelle was completed, using three Liberty engines, driving a large, single geared-down propeller through a patented multi-engine drive system. Gallaudet continued in aeronautical research and development work until 1923, when the corporation was dissolved and the factory and business was acquired by the newly formed Consolidated Aircraft Corporation. 

Gallaudet never lost his interest in aviation and remained active in engineering and research projects for many years. He was also a prominent inventor and [[strikethrough]]holder of[[/strikethrough]] held many patents. Gallaudet passed away suddenly on July 1st, 1945 at his home in Brandford, Connecticut, at age 74, survived by his wife, two daughters and a son. He was buried