 He then modified the hull of the larger Curtiss H-12 flying boat, creating the Felixstowe F.2, that was greatly superior to the original Curtiss boat.Under Porte's supervision the Naval and Seaplane Experimental Station continued to enlarge and improve the design of the Felixstowe aircraft independently of Curtiss, through the F.3 and the F.5; Porte's last design to be built was the 123 ft-span five-engined Felixstowe Fury triplane (also known as the "Porte Super-Baby" or "PSB"), largest seaplane in world and largest British aircraft at the time.The Felixstowes were mainly used on long range patrols to look for the High Seas Fleet or submarines of the Imperial German Navy, however the aircraft were also initially used successfully to intercept Zeppelins.