The Grumman Avenger (US Navy designations TBF and TBM) was an American three-seater carrier-borne torpedo-bomber of the Second World War, entering service in 1942. The Grumman Avenger was a mid-wing cantilever monoplane with folding outer wing-sections. The Grumman Avenger was powered by a 1700 hp Wright R-2600-8 14-cylinder radial air-cooled engine providing a top speed of 445 kmh and a range of 1450 km. Armaments consisted of one 0.30 inch calibremachine-gun in the cowling and two 0.50 inch calibre machine-guns one in each outer wing, one 0.50 inch calibremachine-gun in a power-operated turret and one 0.30 inch calibremachine-gun in the ventral hatch at the aft end of the bomb-bay. The bomb-bay could accommodate one US Navy short air torpedo, one 2000 lb bomb, one 1600 lb armour piercing bomb, four 500 lb bombs or equivalent disposable ordnance. Research Grumman Avenger