 They soon discovered that the Spitfire was a very good aircraft, but not perfect.The rudder was over-sensitive and the top speed was just , a little faster than Sydney Camm's new Merlin-powered Hawker Hurricane.A new and better-shaped wooden propeller meant the Spitfire reached in level flight in mid-May, then Summers flew the K5054 to RAF Martlesham Heath and handed the aircraft over to Squadron Leader Anderson of the Aeroplane & Armament Experimental Establishment (A&AEE).