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Grumman F6F Hellcat
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====Change of powerplant==== Based on combat accounts of encounters between the F4F Wildcat and A6M Zero, on 26 April 1942, BuAer directed Grumman to install the more-powerful, 18-cylinder [[Pratt & Whitney R-2800 Double Wasp]] radial engine β which was already in use with Chance Vought's Corsair since 1940 β in the second XF6F-1 prototype.<ref>Ewing and Lundstrom 2004, pp. 155, 156.</ref> Grumman complied by redesigning and strengthening the F6F airframe to incorporate the {{cvt|2,000|hp|kW}} R-2800-10, driving a three-bladed [[Hamilton Standard]] propeller. With this combination, Grumman estimated the XF6F-3s performance would increase by 25% over that of the XF6F-1.<ref name="Sul4"/> The Cyclone-powered XF6F-1 (02981) first flew on 26 June 1942, followed by the first Double Wasp-equipped aircraft, the XF6F-3 (02982), which first flew on 30 July 1942. The first production F6F-3, powered by an R-2800-10, flew on 3 October 1942, with the type reaching operational readiness with [[VF-9]] on {{USS|Essex|CV-9|6}} in February 1943.<ref name= "Kinzey p. 6">Kinzey 1987, p. 6.</ref>{{Refn|Late-production F6F-3s were powered by the same water-injected R-2800 used by the F6F-5.{{citation needed|date=April 2021}}|group=Note}}
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