Curtiss Model K

The Curtiss Model K, also known as the Model 4, was a single-engined pusher flying boat that the Curtiss Aeroplane Company developed in 1914 as an enlarged Model F. It was a three-bay biplane with staggered, slightly swept wings, ailerons on the upper wing, and a 150 hp Curtiss V-X engine between the wings. Engine trouble delayed its first flight until January 1915, and it was claimed to be the largest single-engined flying boat in the world at the time. The type found no orders at home, but the Imperial Russian Navy ordered at least 51 in flying boat and landplane versions; shipped crated by way of Vancouver and Vladivostok, many reached service with cracked hulls.