Prototype modification of the deck fighter Grumman XF6F-4 Hellcat (BuNo 02981) at the aerodrome of the Langley Research Center NACA. Armed with four 20-mm cannons. Turbocharged (Pratt & Whitney R-2800-27 engine) is being tested instead of the mechanic supercharger mechanism used in the standard F6F).
Location: Virginia, USA
Date: 05 May 1944