Curtiss Model S

The Curtiss Model S, also called the Speed Scout or Model 10, was a single-seat fighter that Curtiss designed as its first attempt at a fast and maneuverable fighting aeroplane. The first variant, the S-1, performed disappointingly; new wings in March 1917 made it the S-2. In 1917 the S-3 became the first triplane in service in the United States. Curtiss then tried seaplane versions, the S-4 with two floats and the S-5 with one central float and wingtip floats, in 1918 and 1919. The S-6 was meant to be an improved, armed S-3 but performed poorly, and of twelve ordered by the Army Signal Corps only one was delivered. The S-3 had a 100 hp Curtiss OXX-3 engine and reached 115 mph.