This led to some controversy over whether the Mustang's cooling system aerodynamics were developed by NAA's engineer Edgar Schmued or by Curtiss, although NAA had purchased the complete set of P-40 and XP-46 wind tunnel data and flight test reports for US$56,000.
Isto levou a certa controversia sobre se a aerodinámica do sistema de refrixeración do Mustang foi desenvolvido polo enxeñeiro de North American Aviation Edgar Schmued ou por Curtiss, aínda que NAA mercara todos os datos das probas no túnel e de voo do P-40 e XP-46 por 56.000 dólares.