Field, New York City, New York. Repaired. 22 March Prototype Grumman XF3F-1, BuNo 9727 (1st), c/n 257, company model G-11, first flown 20 March 1935, disintegrates when pulled sharply out of a terminal velocity dive, the tenth and final such test in six flights, killing pilot Jimmy Collins. G-forces in this dive estimated at 12–13, wrenching wings off, engine torn from mount. The airframe impacted in Pinelawn Cemetery, Farmingdale, Long Island. 9727 serial applied to three Grumman prototypes, two of which crashed. The Navy immediately orders a replacement which will be completed in two months and fly on 9 May. April Yugoslavian Air Force Ikarus IK-1, high-wing monoplane fighter, first prototype crashes on third flight at Zemun airfield when it fails to recover from power dive, pilot Capt. Leonid Bajdak, parachuting to safety. Examination of wreck revealed that fabric covering of the port wing had failed due to negligence in sewing the seams. Second prototype ordered as Ikarus IK-2, wings metal-skinned. 16 April Flying Officer Clive Newton Edgerton takes off from Laverton in RAAF Westland Wapiti, A5-31, but after entering a steep dive from 15,000 feet is unable to recover. "The structure of the aircraft failed during the test flight and the aircraft crashed at Werribee." Witnesses reported that the wings failed and folded back along the fuselage. The lower starboard wing landed in a paddock 1½ miles from the fuselage. The Aircraft Accident Investigation Committee (AAIC) reported that "The tailplane actuating gear was in full forward position...the aircraft had five ballast weights in the tail...when there should have been six, and in addition another four in the passenger's cockpit, so that the aircraft was obviously tail light and nose heavy. Apparently the pilot had his tail actuating gear into the full forward, giving maximum lift to the tail to enable him to go into a dive." The speed of Edgerton's dive was so great that the blades of the airscrew were pulled from the boss by the centrifugal force. 17 May Second of three Grumman XF3F-1 prototypes, BuNo 9727 (2nd), first flown 9 May, crashes on the first day it arrives at NAS Anacostia. Pilot Lee Gelbach is unable to recover from a flat spin which develops during a ten-turn right-hand spin demonstration – bails out safely. "The pilot's report indicated that high speeds induced directional instability. This caused the XF3F-1 to enter a flat spin from which recovery