Curtiss R-6, US Army serial numbers 505

Photo from Ron DiPillo

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Information from Peter Bowers's book Cutriss Aircraft, 1907-1947

R-6 (Model 2A)-The R-6 of early 1917 was a long-wing seaplane like the R-3 and diflered from it mainly in use of the 200 hp V-2-3 engine and three degrees of dihedral in the outer wing panels. All but one of the seventy-six R-6s delivered to the US Navy had twin floats, serial number A193 being fitted with a single float. Army R-6s were delivered both as landplanes and as twin-float seaplanes. The US Army ordered 18, but most are believed to have been released to the Navy before Army acceptance. Navy R-6s became the first American-built aeroplanes to serve US forces overseas in World War I when a squadron was assigned to patrol duty in the Azores in January 1918. Average cost of the R-6 and similar R-9 was $15,200 less GFE. US Navy serial numbers: A162/197 (36), A302/341 (40). US Army serial numbers: 504/521