It was an enlarged derivative of Curtiss's Model F and about 50 were built for export to the Imperial Russian Navy.

It was a three-bay biplane powered by a 150 hp (112 kW) Curtiss V-X engine mounted in a pusher configuration between the wings.

[1][2] The first flight of the Model K was delayed by problems with its engine until January 1915, with it being claimed that the aircraft was the largest single-engined flying boat in the world at the time.

[2] While the Model K did not attract orders from home,[3] attempts to export it were more successful, resulting in an order for at least 51 aircraft in both flying boat and landplane versions from the Imperial Russian Navy in 1914.

[3][5] Data from Curtiss Aircraft 1907–1947[3]General characteristics Performance