FSX-FS2004 Mustang P-51a
On September 9, 1940, only 102 days after the contract had been signed, the NA-73X prototype was rolled out though still waiting for its engine. The new fighter was named Mustang by the British, and the first British version was designated Mustang I. As soon as it was available, the 1,120hp Allison V-171 0-39 power plant was installed, and engine and taxi tests began. By comparison, Mustangs with the Allison engine could outperform the Merlin-powered variants below 15,000 feet. When production of the Allison-engined Mustang ended, 1580 examples had been built. GMAX mdl by A.F.Scrub