sentences:  A further four aircraft were built powered by a 225 hp (168 kW) Sunbeam engine, known as the Improved Navyplane Type A.II.The Navyplanes were used for maritime reconnaissance missions over the North Sea, while four of the Improved Navyplanes were sent to the Dardanelles to serve in the Gallipoli Campaign.The four Sunbeam-powered aircraft proved unsuccessful owing to unreliability of the powerplant, and only saw limited use.