Initially, the heaviest bombs carried by Lancasters were 4,000 lb (1,820 kg) “Cookies ”. Bulged doors were added to allow the aircraft to carry 8,000 lb (3,600 kg) and later 12,000 lb (5,450 kg) “Cookies”. Towards the end of the war, attacking special and hardened targets, the B.I Specials could carry the 21 ft (6.4 m) long 12,000 lb (5,450 kg) “Tallboy” or 25.5 ft (7.77 m) long 22,000 lb (9,980 kg) “Grand Slam” “earthquake” bombs.
Avro 683
Lancaster Mk.X
An important feature of the Lancaster was its unobstructed 33 ft (10 m) long bomb bay. The typical bomb load for a Lancaster was 14,000 lb (6,400 kg).