 His first design implemented at Felixstowe was the Porte Baby, a large, three-engined biplane flying-boat powered by one central pusher and two outboard tractor Rolls-Royce Eagle engines.Between November 1915 and 1918 it was the largest flying boat built and flown in the United Kingdom.Porte modified a Curtiss H-4 (No.3580) with Hispano-Suiza engines and a new hull whose improved hydrodynamic qualities made taxiing, take-off and landing much more practical, and renamed it the Felixstowe F.1.