Beardmore-Halford-Pullinger (BHP) were a series of aircraft engines used in production between 1916 and 1918. The engines were used on many notable First World War aircraft, such as the Airco DH.4, DH.9, Airco DH.10 Amiens, de Havilland DH.15 and Avro 529 aircraft. The engines were used as the basis for later designs such as the Siddeley Puma and A.D.C Nimbus (1926).