Thede Havilland Goblin,originally designated as theHalford H-1,is an earlyturbojetengine designed byFrank Halfordand built byde Havilland.The Goblin was the second British jet engine to fly, after Whittle'sPower Jets W.1,and the first to pass atype testand receive a type certificate issued for an aircraft propulsion turbine.[1]
| Goblin | |
|---|---|
| |
| Cutaway Goblin II | |
| Type | Turbojet |
| Manufacturer | de Havilland Engine Company |
| First run | 13 April 1942 |
| Major applications | de Havilland Vampire |
| Developed into | de Havilland Ghost |
Although it was conceived in 1941 it remained unchanged in basic form for 13 years by which time it had evolved to the Mk. 35 export version.[2]
The Goblin was the primary engine of thede Havilland Vampire,and was to have been the engine for theF-80 Shooting Star(as theAllis-ChalmersJ36) before that design switched engines due to production delays at Allis-Chalmers. The Goblin also powered theSaab 21Rfighter,Fiat G.80trainer and thede Havilland DH 108"Swallow" experimental aircraft. The Goblin was later scaled up as the largerde Havilland Ghost,with the model numbers continuing from the last marks of the Goblin.
Design and development
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Design of the engine was carried out by Frank Halford at his London consulting firm starting in April 1941.[3]It was based on the overall design pattern pioneered byFrank Whittle,using acentrifugal compressorproviding compressed air to sixteen individual combustion chambers, from which the exhaust powered a single-stage axial turbine.
Compared to Whittle designs, the H-1 was cleaned up in that it used a single-sided compressor with the inlet at the front, and a straight-through layout with the combustion chambers exhausting straight onto the turbine. Whittle's designs such as thePower Jets W.2used a reverse-flow layout that piped the hot air back to the middle of the engine, in order to "fold" it and reduce its length. The straight-through design simplified the engine, at the expense of being slightly longer and requiring a longer power shaft between the turbine and compressor.[4]Although it eliminated the Whittle-style "folding", the Goblin was still a compact design.
The H-1 first ran on 13 April 1942 and quickly matured to produce its full design thrust within two months. It first flew on 5 March 1943 in theGloster Meteor,and on 26 September in thede Havilland Vampire.[5]It was around this time that de Havilland purchased Halford's company and set him up as the chairman of thede Havilland Engine Company,with the engine name changing from H-1 to "Goblin", while the new H-2 design became the "Ghost" – de Havilland jet and rocket engines were all named afterspectral apparitions.
In July 1943, one of the two H-1s then available (actually the spare engine intended as a backup for the one installed in the Vampireprototype) was sent to theUnited States,where it was selected to become the primary engine of theLockheed P-80 Shooting Star.This engine was fitted to the prototype P-80, which first flew on 9 January 1944. The engine was later accidentally destroyed in ground testing, and was replaced by the only remaining H-1 from the prototype Vampire.[5]Allis-Chalmerswas selected to produce the engine in the US as theJ36,but ran into lengthy delays. Instead, theAllison J33,developed byGeneral Electricas the I-40 (their greatly improved 4,000 lbf (18 kN) version of theJ31,itself based on Whittle'sW.1), was selected for the production P-80A.
Variants
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- H.1/Goblin I
- Developed about 2,300 lbf (10.2 kN) thrust (nominal thrust for prototype) and 2,700 lbf (12.0 kN) for production models.
- Goblin II (DGn.2)
- 3,100 lbf (13.8 kN)
- Goblin 3 (DGn.3)
- 3,350 lbf (14.9 kN)
- Goblin 35
- 3,500 lbf (15.6 kN)
- Goblin 4 (DGn.4)
- 3,750 lbf (16.7 kN)
- Allis-Chalmers J36
- Licence production in the United States byAllis-Chalmers.
- Svenska Flygmotor RM1
- Goblin II production in Sweden
- Svenska Flygmotor RM1A
- Goblin III production in Sweden
Applications
editAircraft applications
edit
- Curtiss XF15C-1
- de Havilland DH 108 Swallow
- de Havilland Vampire
- Fiat G.80
- Gloster Meteor
- Lockheed XP-80 Shooting Star
- Saab 21R
Alternative applications
editEngines on display
editGoblin engines are preserved and on display at severalmuseumsincluding:
- Brooklands Museum
- South Yorkshire Aircraft Museum
- Canadian Warplane Heritage Museum
- de Havilland Aircraft Museum
- Midland Air Museum
- Royal Air Force Museum Cosford
- Shuttleworth Collection
- Vintage Flying Museum
- Queensland Air Museum,Caloundra, Australia
- A part-sectioned engine is on display atHistorical Aircraft Restoration Societyat Albion Park, New South Wales, Australia
- Technical University of Madrid
- University of Hertfordshire - College Lane Campus
Survivors
editAs of June 2011, two Goblin-powered de Havilland Vampires remain airworthy on the British register.[6]
As of December 2014, three Goblin-powered de Havilland Vampires remain airworthy in North America. N115DH is owned by the World Heritage Air Museum.,[7]C-FJRH is operated under the Jet Aircraft Museum in Ontario, Canada.[8]and N593RH is owned by Vampire Aviation LLC.
As of November 2015, three Goblin-powered de Havilland Vampires remain airworthy in South Africa. Serial number 276 and 277 are in the SA Air Force Museum and the third is at Wonderboom Airport.
Specifications (D.H Goblin II D.Gn 27)
editGeneral characteristics
- Type:Turbojet
- Length:107 in (2,700 mm)
- Diameter:50 in (1,300 mm)
- Dry weight:1,550 lb (700 kg)
Components
- Compressor:single-sided,centrifugal flow
- Combustors:16chambers
- Turbine:single stageaxial flow
- Fuel type:kerosene
- Oil system:metered pressure spray at 50 psi (3.4 bar), dry sump
Performance
- Maximumthrust:3,000 lbf (13 kN) at 10,200 rpm at sea level
- Overall pressure ratio:3.3:1
- Air mass flow:60 lb/s (27 kg/s) at 17,000 rpm
- Turbine inlet temperature:1,472 °F (800 °C)
- Fuel consumption:3,720 lb/hr (465 imp gal/hr), (1,687 kg/hr) or (2,114 L/hr)
- Specific fuel consumption:1.18 lb/(lbf⋅h) (33 g/(kN⋅s))
- Thrust-to-weight ratio:1.9
See also
editRelated development
Related lists
References
editNotes
edit- ^Gas Turbines and Jet Propulsion,G.Geoffrey Smith M.B.E., Revised and Enlarged By F.C. Sheffield, Sixth edition 1955, Iliffe & Sons Ltd., London. p.220
- ^"Aero Engines 1954..."Flight.9 April 1954.Retrieved26 August2017.
- ^Smith 1946, p.94.
- ^"De Havilland Goblin 2".The Canadian Museum of Flight.Retrieved2 December2021.
- ^abGunston 1989, p.51.
- ^G-INFO – UK CAA databaseArchived6 June 2011 at theWayback MachineRetrieved: 24 June 2011
- ^"Home".worldheritageairmuseum.org.
- ^"De Havilland DH-115 T.55 Vampire (C-FJRH) - Jet Aircraft Museum".Archived fromthe originalon 31 December 2014.Retrieved31 December2014.
- ^Smith 1946, p.98.
- ^Wilkinson, Paul H. (1946).Aircraft Engines of the world 1946.London: Sir Isaac Pitman & Sons. pp. 286–287.
Bibliography
edit- Gunston, Bill.World Encyclopedia of Aero Engines.Cambridge, England. Patrick Stephens Limited, 1989.ISBN1-85260-163-9
- Smith, Geoffrey G.Gas Turbines and Jet Propulsion for Aircraft,London S.E.1, Flight Publishing Co.Ltd., 1946.
- Kay, Anthony L. (2007).Turbojet History and Development 1930–1960.Vol. 1 (1st ed.). Ramsbury: The Crowood Press.ISBN978-1-86126-912-6.
- Wilkinson, Paul H. (1946).Aircraft Engines of the world 1946.London: Sir Isaac Pitman & Sons. pp. 286–287.
External links
edit
- DH Goblin at EnginesUK
- "De Havilland Goblin"a 1945Flightarticle
- "Series II Goblin"a 1946Flightarticle
- "Development of the Goblin Engine"a 1947Flightarticle
- "Maintenance At A Minimum – D.H. Goblin Completes a Second 500-Hour Test Run"– a 1949Flightnews item