Grumman F6F Hellcat. The Grumman F6F Hellcat was a carrier-based fighter aircraft developed to replace the earlier F4F Wildcat in United States Navy (USN) service. Although the F6F resembled the Wildcat, it was a completely new design powered by a 2,000 hp Pratt & Whitney R-2800. Some tagged it as the 'Wildcat's big brother'. First 60 pages are about the development & testing written by the late Corky Myers. The day to day operational history of were and with what squadron the Hellcat served with. 224 pages of history and photos