The Lancaster Bomber is a British heavy bomber used during World War II. Designed by Avro, it first flew in 1941 and became one of the most effective bombers of the war. The aircraft was known for its large payload capacity, allowing it to carry a variety of bombs, including the famous Grand Slam and Tallboy bombs. With a wingspan of 102 feet, the Lancaster was powered by four Rolls-Royce Merlin engines, enabling it to reach speeds of up to 287 mph. It played a crucial role in the Battle of Britain and was instrumental in strategic bombing campaigns over Germany, contributing significantly to the Allied victory.