A larger model of flying boat developed during World War I, the Curtiss H-16 was used for bombing missions against German U-boats. Ferquent mechanical problems limited its effectiveness.
In "Stalking the U-Boat" (University Press of Florida, 2010), historian Geoffrey L. Rossano says of the H-16: "It measured 46 feet in length, with a 96-foot wingspan. Two 400 hp Liberty motors provided the power, generating a top speed of 95 mph. With an empty weight of 7,400 pounds and loaded weight of 10,900 pounds, the H-16 carried a crew of four, radio equipment, four or five machine guns, and two 230-pound depth bombs," (170).
Swanborough, Gordon; Bowers, Peter M. (1976) United States Navy Aircraft since 1911 (2nd ed.), London: Putnam, pp. p.106, via Wikimedia Commons