The Avro Lancaster was the Royal Air Force's main four-engine bomber in World War II. Its superb design, overall performance, and load-carrying capacity proved key factors in successfully prosecuting the nocturnal bombing offensive against Hitler's industrial and military base. With its ability to carry up to 16,000 pounds in explosives and incendiaries, specialist Lancasters could also deliver the 12,000-pound "Tallboy" and 22,000-pound "Grand Slam"...