Last updated May 6, 2008
In April, 1942, a British test pilot, Ronald Harker, flew the Mustang and was very impressed by it. He suggested that the new plane would be a natural fit with the Rolls Royce Merlin 60-series engine, well-suited to high altitudes. At the prodding of Major Thomas Hitchcock, the Americans began working along the same lines (using the Packard license-built version of the Merlin), and the first Merlin-equipped Mustang, the P-51B, flew in November, 1942. The results were impressive, to say the least. At 30,000 feet, the improved Mustang reached 440 MPH, almost 100 MPH faster than the Allison-equipped Mustang at that altitude.
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