P-51 Mustang vs Spitfire Mk XIV: Which Was Actually Better?

In early 1944, the RAF flew its newest Spitfire, the Mark XIV, against the Merlin-powered Mustang III. In a close fight, the testers had a clear winner. Then they wrote two words that changed the whole comparison: “No endurance.” This video goes through what the RAF’s Air Fighting Development Unit actually measured, speed, climb, turn, roll, dive and range, and why the fighter that won almost every close-combat category was not the answer to every mission. CHAPTERS 0:00 The RAF test 0:51 What the testers flew 1:29 Speed 1:50 Climb 2:45 Turn, roll and wing loading 3:34 Handling 4:48 The dive: the Mustang’s way out 5:23 Compressibility 6:32 “No endurance” 8:19 The price of drop tanks 10:18 Collier and the V-1 11:15 The escort mission 12:42 The RAF’s verdict 13:17 Two answers to two problems 13:50 Collier’s fate SOURCES Air Fighting Development Unit, tactical trials of the Mustang III, ref. AFDU/3/21/36 (report dated 8 March 1944). Full transcription: https://www.wwiiaircraftperformance.o... Air Fighting Development Unit, tactical trials of the Spitfire F Mk XIV (1944) RAF Museum: Flying Officer Kenneth Collier, No. 91 Squadron, and the first V-1 tipped over by wingtip (23 June 1944) Imperial War Museums: history of RAF Fighter Command FOOTAGE “V-1” (Crown Film Unit, 1944), Australian War Memorial F01883, public domain “RAAF Spitfires” (1944), Australian War Memorial F01618, public domain This video uses an AI-generated narration voice. The research, script and sources are my own.