The
Avro Lancaster is a
British four-engined
Second World War heavy bomber designed and built by
Avro for the
Royal Air Force (RAF). It first saw active service with
RAF Bomber Command in 1942 and, as the
strategic bombing offensive over Europe gathered momentum, it was the central implement for the night-time bombing campaigns that followed. It became the main
heavy bomber used by the RAF, the
RCAF, and squadrons from other
Commonwealth and
European countries serving within the RAF, overshadowing its close contemporaries the
Handley Page Halifax and
Short Stirling. The "Lanc", as it was affectionately known, thus became one of the more famous and most successful of the Second World War night bombers, "delivering 608,612
long tons of bombs in 156,000 sorties." The Lancaster, an evolution of the troublesome
Avro Manchester, was designed by
Roy Chadwick and was powered by four
Rolls-Royce Merlins, or, in one version,
Bristol Hercules engines.