 These early flying boats did not have sufficient power, and the naval station at Felixstowe soon replaced their Curtiss engines with Anzani 10-cylinder powerplants.More Curtiss aircraft were ordered, but their 160 hp Curtiss engines were deemed unsatisfactory and replaced with 250 hp Rolls-Royce Falcon engines, being known as H-12s or "Large Americas".Once the project was under way Porte assisted with the assembly and testing of the "America" flying boats at RNAS Felixstowe, he was officially posted to Felixstowe in September 1915 as commander of the Experimental Flying Wing where he would frequently fly on offensive patrols to gather what was required of the aircraft.