The Halifax was powered by four Rolls-Royce Merlin X engines and had a crew of seven, the pilot, engineer, bomb aimer/observer, navigator, wireless operator, mid-upper gunner and tail-gunner. It had a maximum speed of 265 mph at 17,500 ft with a maximum ceiling of 22,800 ft and a range of 1,860 miles. It had 6 x 0.303 in. machine guns, 2 in the mid-upper position and 4 in the tail turret, and was capable of carrying 13,000 lbs of bombs.