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A Grumman F9F-6 Cougar fighter of fighter squadron VF-24 Corsairs after having just landed aboard the aircraft carrier USS Essex (CVA-9) in the summer of 1955. (Source: U.S. Navy)
Design and development
Prototypes, modified Panthers, were quickly produced and the first (XF9F-6) flew on September 20, 1951. To the surprise of the Navy (who had been cautious about adopting swept-wing fighters on the carrier deck) the Cougar was easier to fly from carriers than the Panther. The aircraft was still subsonic, but the critical Mach number was increased from 0.79 to 0.86 at sea level and to 0.895 at 35,000 feet (10,000 m), improving performance markedly. The Cougar, unlike the Panther, would not be outclassed by Russian Mikoyan-Gurevich MiG-15s, but it was too late to see Korean war service.
Sources:
Wikipedia: Grumman F9F Cougar
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