Avro Lancaster B.III Special The Dambusters 617 Squadron Operation Chastise 1943 1:72 scale Airfix Diecast Model Airplane Kit This Avro Lancaster B.III Special (The Dambusters 617 Squadron Operation Chastise 1943) diecast model airplane kit. It is made by Airfix & is 1:72 scale (approx. 43cm / 16.9in wingspan).