12/29/2014. Remarks by Johan Visschedijk: "One of the most unusual designs in the USN inventory was the Gallaudet D-series, produced by the Gallaudet Engineering Company, Norwich, Connecticut. This featured the power plant amidships driving a geared-down four-blade propeller mounted on a ring encircling the fuselage. The D-1 (A-59) was powered with two 150 hp Dusenberg engines mounted side-by-side. Following delivery of the D-1 in January 1917, the firm reorganized as Gallaudet Aircraft Corporation, and moved to Greenwich, Rhode Island. Two D-4s, powered with single Liberty engines, were then produced for the USN (A-2653, A-2654)."