The de Havilland PS.23 or PS.52 Gyron, originally the Halford H-4, was Frank Halford's last turbojet design while working for de Havilland. Intended to outpower any design then under construction, the Gyron was the most powerful engine of its era, producing 20,000 lbf (89 kN) "dry", and 27,000 lbf (120 kN) with afterburner ("reheat" in British terminology).
The design proved too powerful for contemporary aircraft designs and saw no production use. It was later scaled down to 45% of its original size to produce the de Havilland Gyron Junior, which was somewhat more successful.[1]
The Gyron was Halford's first axial-flow design, a complete departure from his earlier centrifugal-flow engines based on Whittle-like designs, the Goblin (H-1) and Ghost (H-2). The Gyron was also one of the first engines designed specifically for supersonic flight.
The Gyron first ran in 1953. Flight testing started in 1955 on a modified Short Sperrin, a bomber design that was instead turned into an experimental aircraft. The Sperrin used four Rolls-Royce Avons, mounted in over/under pairs in a single pod on each wing. For testing, the lower Avons were replaced with the much larger Gyrons. Flight rating was 18,000 lbf (80,000 N). In 1955 the DGy.1 received an official rating of 15,000 lbf (67,000 N).[2] Addition of a reheat section boosted output to 20,000 lbf (89,000 N) and then 25,000 lbf (110,000 N) in the DGy.2
The Gyron was selected for a number of projects, most notably the Hawker P.1121 (sometimes referred to as the Hurricane) supersonic attack aircraft that was to have been the replacement for the Hawker Hunter. However, this project was eventually cancelled. Another design potentially based on the Gyron was the Operational Requirement F.155 interceptor, which optionally used the Rolls-Royce RB.106. F.155 was also cancelled, part of the 1957 Defence White Paper. Government financial support of the Gyron project itself was cancelled in March 1957, at a reported total cost of £3.4 million.[3][2]
^Gunston, Bill (1989). World Encyclopaedia of Aero Engines (2nd ed.). Cambridge, England: Patrick Stephens Limited. p. 32. ISBN978-1-85260-163-8.
^ ab"GYRON : de Havilland's Supersonic Turbojet, with 25,000 lb. Reheat Rating". Flight and Aircraft Engineer. 72 (2532): 163–168. 2 August 1957. Retrieved 17 March 2019.
^"Cancelled projects: the list up-dated". Flight: 262. 17 August 1967.
^Wilkinson, Paul H. (1957). Aircraft engines of the World 1957 (15th ed.). London: Sir Isaac Pitman & Sons Ltd. pp. 146–147.
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Photo of DH Gyron at DH Heritage Centre
January 07, 2023
havilland, gyron, havilland, gyron, originally, halford, frank, halford, last, turbojet, design, while, working, havilland, intended, outpower, design, then, under, construction, gyron, most, powerful, engine, producing, with, afterburner, reheat, british, ter. The de Havilland PS 23 or PS 52 Gyron originally the Halford H 4 was Frank Halford s last turbojet design while working for de Havilland Intended to outpower any design then under construction the Gyron was the most powerful engine of its era producing 20 000 lbf 89 kN dry and 27 000 lbf 120 kN with afterburner reheat in British terminology Gyronde Havilland Gyron at the de Havilland Aircraft MuseumType TurbojetManufacturer de Havilland Engine CompanyFirst run 1953Major applications Hawker P 1121 not built Developed into de Havilland Gyron JuniorThe design proved too powerful for contemporary aircraft designs and saw no production use It was later scaled down to 45 of its original size to produce the de Havilland Gyron Junior which was somewhat more successful 1 Contents 1 Design and development 2 Engines on display 3 Specifications Gyron D Gy 2 3 1 General characteristics 3 2 Components 3 3 Performance 4 See also 5 References 6 External linksDesign and development EditThe Gyron was Halford s first axial flow design a complete departure from his earlier centrifugal flow engines based on Whittle like designs the Goblin H 1 and Ghost H 2 The Gyron was also one of the first engines designed specifically for supersonic flight The Gyron first ran in 1953 Flight testing started in 1955 on a modified Short Sperrin a bomber design that was instead turned into an experimental aircraft The Sperrin used four Rolls Royce Avons mounted in over under pairs in a single pod on each wing For testing the lower Avons were replaced with the much larger Gyrons Flight rating was 18 000 lbf 80 000 N In 1955 the DGy 1 received an official rating of 15 000 lbf 67 000 N 2 Addition of a reheat section boosted output to 20 000 lbf 89 000 N and then 25 000 lbf 110 000 N in the DGy 2The Gyron was selected for a number of projects most notably the Hawker P 1121 sometimes referred to as the Hurricane supersonic attack aircraft that was to have been the replacement for the Hawker Hunter However this project was eventually cancelled Another design potentially based on the Gyron was the Operational Requirement F 155 interceptor which optionally used the Rolls Royce RB 106 F 155 was also cancelled part of the 1957 Defence White Paper Government financial support of the Gyron project itself was cancelled in March 1957 at a reported total cost of 3 4 million 3 2 Engines on display EditAn example of the Gyron is held by the Science Museum London another is on public display at the de Havilland Aircraft Museum St Albans Specifications Gyron D Gy 2 Edit Rear view Data from Aircraft engines of the World 1957 4 General characteristics Type Turbojet Length 154 in 3 9 m Diameter 46 25 in 1 175 m Dry weight 3 500 lb 1 600 kg Components Compressor Seven stage axial flow Combustors Annular combustion chamber with 16 duplex burners Turbine Two stage axial flow Fuel type Aviation Kerosene JP 4 Oil system Pressure spray at 40 50 psi 280 340 kPa with scavengePerformance Maximum thrust 20 000 lbf 89 kN at 6 400 rpm static Overall pressure ratio 6 1 Air mass flow 320 lb s 150 kg s Specific fuel consumption 1 00 lb lbf h 0 028 kg N ks at maximum thrust subsonic Thrust to weight ratio 5 88See also EditRelated development de Havilland Gyron JuniorComparable engines Orenda IroquoisRelated lists List of aircraft enginesReferences Edit Gunston Bill 1989 World Encyclopaedia of Aero Engines 2nd ed Cambridge England Patrick Stephens Limited p 32 ISBN 978 1 85260 163 8 a b GYRON de Havilland s Supersonic Turbojet with 25 000 lb Reheat Rating Flight and Aircraft Engineer 72 2532 163 168 2 August 1957 Retrieved 17 March 2019 Cancelled projects the list up dated Flight 262 17 August 1967 Wilkinson Paul H 1957 Aircraft engines of the World 1957 15th ed London Sir Isaac Pitman amp Sons Ltd pp 146 147 External links Edit Wikimedia Commons has media related to De Havilland Gyron Photo of DH Gyron at DH Heritage Centre Retrieved from https en wikipedia org w index php title De Havilland Gyron amp oldid 1105483063, wikipedia, wiki, book, books, library,
