Flight was then based. Initial flight testing was made by Bert Hinkler, who asked Shorts to enlarge the aircraft's rudder area before he attempted to fly it. On 4 May Hinkler flew the aircraft for the first time, making a flight during which he achieved an average speed of over a measured mile. On landing Hinkler touched down first with the left- hand float, causing the aircraft to slew round, resulting in severe buckling of the float struts. Hinkler reported that the aircraft suffered from severe hunting at full throttle, admitting that he had been wrong about the rudder area. The main problem encountered was intake surging, which caused the engine to cut out intermittently. After repairs, restoration of the rudder to the original size and some alterations to alleviate the intake problem, Hinkler made a second flight, after which the aircraft was formally accepted by the RAF, and RAF markings and serial number were painted on the tailfin. The first RAF pilot to fly it was Flt, Lieut. S.N. Webster, who reported its flight characteristics to be pleasant, although the engine still tended to cut out: this led to some alarming episodes when the aircraft was later flown by Flying Officer H.M. Schofield. During July a number of modifications were made: a new engine was fitted, together with a forged duralumin racing propeller, an additional fuel tank was fitted in the right-hand float to provide sufficient range to complete the Schneider course, high-temperature spark plugs were fitted and changes were made to the air inlets in a further attempt to cure the engine problems. In mid August the Crusader was dismantled and shipped on HMS Eagle to Venice. Here it was fitted with the race engine, but since it was obviously slower than the other aircraft entered, it was intended to use it solely as a practice aircraft. On 11 September Schofield took off in the aircraft: since the aircraft with full fuel load was heavy on takeoff, he held the aircraft close to the water to build up speed. It is probable that the aircraft encountered a thermal caused by the hot weather, for suddenly the right wing lifted. Schofield attempted to correct this, but the control wires to the ailerons had been crossed during reassembly, so that the aileron movement was reversed. The aircraft continued the roll, and hit the water at a speed of . The