his aircraft also known as the "Grand Slam Bomber", was powered by four Rolls Royce Merlin engines, and was used by the English Royal Air Force in bombing raids against Germany. Approximately 7,377 units were built. The Avro Lancaster B Mk.I/III specifications are as follows: Length: 21.18m, Width: 31.10m, Weight: 33.11t, Power source: Four Rolls Royce Merlin engines (1480-1640hp) The Tamiya model assembly kit faithfully captures this piece of WWII aircraft history.