Beardmore Halford Pullinger
Beardmore-Halford-Pullinger (BHP) were 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 name is derived from the three elements of:
- Sir William Beardmore of William Beardmore and Company: Responsible for funding and providing original engines from his production company, which manufactured aero engines used in many aircraft prior to 1916 such as the 120 hp, 160 hp and Beardmore Tornado (diesel). They also manufactured aircraft and airships, such as the Beardmore W.B.III, and R23X class airship. The company provided designs which were modified into the B.H.P. engines.
- Major Frank Halford: Responsible for proposing modifications to the engines originally taken from Beardmore designs. Halford also later designed the de Havilland Gipsy aero engine, designed the first turbo charged racing car engine, the Halford Special and one of the first jet engines, the Halford H.1 later developed by de Havilland as the de Havilland Goblin.
- Thomas Pullinger: Halford's proposals were made a working proposition by engineer and managing director of the Arrol-Johnston car factory T C Pullinger. Arrol-Johnston had manufactured the Austro - Daimler as the 160 hp Beardmore aero-engine. Arrol-Johnston's works was at Heathhall in Dumfries and continued development and production of aero engines such as the B.H.P. The B.H.P. was handed over to the Siddeley Motor Company and their version which had further improvements became well known as The Puma. Galloway Engineering was a subsidiary of Arrol-Johnston. Pullinger continued production of the B.H.P. post-war as the Galloway Adriatic.
- 230 hp
The 230 hp was a six-cylinder petrol aero engine. A new company, the Galloway Engineering Co. Ltd. was started in Dumfries to continue development and production of the 230 hp engine. Endurance tests began in June 1916 in a DH.4 modified by Geoffrey de Havilland and tested by the Central Flying School.
Production was ordered and the contract given to Siddeley-Deasy for units to be built at their Parkside works. John Siddeley himself worked on the engine and would later, after additions to the watercooling system, release an improved 240 hp version as the Siddeley Puma. Motor Co. Ltd. Coventry, Siddeley-Deasy and the Arrol Johnston factory were eventually called upon to assist production as Galloway Engineering could not produce enough units per week, after which they were left with just making the steel engine blocks.
- "The De Havilland D.H.9", Flight, Iliffe and Sons Ltd, p. 386b, 6 April 1956, retrieved 8 March 2011 CS1 maint: discouraged parameter (link)
- Spooner, Stanley, ed. (4 March 1926). "The A.D.C "Nimbus" Engine" (PDF). Flight: 122. Retrieved 8 March 2011. CS1 maint: discouraged parameter (link)
- "The B.H.P. Aero Engine", Flight, p. 88, 3 February 1921, retrieved 8 March 2011 CS1 maint: discouraged parameter (link)
- page 120, The Aeroplane, 2 February 1921