 Most of the other uses for the Allison were for low-altitude designs, where a simpler supercharger would suffice.Fitting a turbocharger into the Mustang proved impractical, and Allison was forced to use the only supercharger available.In spite of this, the Mustang's advanced aerodynamics showed to advantage, as the Mk I was about faster than contemporary P-40s using the same V-1710-39 (producing at , driving a diameter, three-blade Curtiss-Electric propeller).