Rolls-Royce Olympus

Olympus
Preserved Bristol Siddeley Olympus Mk 301 Engine Change Unit (ECU) complete with ancillaries and bulkheads.
Type Turbojet
National origin United Kingdom
Manufacturer Bristol Aero Engines
Bristol Siddeley Engines Limited
Rolls-Royce Bristol Engine Division
First run 1950
Major applications Avro Vulcan
BAC TSR-2
Developed into Rolls-Royce/Snecma Olympus 593
Rolls-Royce Marine Olympus

The Rolls-Royce Olympus (originally the Bristol B.E.10 Olympus) was the world's first two-spool axial-flow turbojet aircraft engine design,[1][2] dating from November 1946,[3][4] although not the first to run or enter service. It was originally developed and produced by Bristol Aero Engines. First running in 1950,[5] its initial use was as the powerplant of the Avro Vulcan V bomber. The design was further developed for supersonic performance as part of the BAC TSR-2 programme. Later it saw production as the Rolls-Royce/Snecma Olympus 593, the powerplant for Concorde SST. Versions of the engine were licensed to Curtiss-Wright in the US as the TJ-32 or J67 (military designation) and the TJ-38 'Zephyr'. The Olympus was also developed with success as marine and industrial gas turbines.

Bristol Aero Engines (formerly Bristol Engine Company) merged with Armstrong Siddeley Motors in 1959 to form Bristol Siddeley Engines Limited (BSEL), which in turn was taken over by Rolls-Royce in 1966.

As of 2012, the Olympus remains in service as both a marine and industrial gas turbine.

Background

Origins

At the end of World War II, the Bristol Engine Company’s major effort was the development of the Hercules and Centaurus radial piston engines. By the end of 1946, the company had only 10 hours of turbojet experience with a small experimental engine called the Phoebus which was the gas generator or core of the Proteus turboprop then in development.[6] In early 1947, the parent Bristol Aeroplane Company submitted a proposal for a medium-range bomber to the same specification B.35/46 which led to the Avro Vulcan and Handley Page Victor. The Bristol design was the Type 172 and was to be powered by four or six Bristol engines of 9,000 lbf (40 kN) thrust[7] to the Ministry engine specification TE.1/46.

The thrust required of the new engine, then designated B.E.10 (later Olympus), would initially be 9,000 lbf (40 kN) with growth potential to 12,000 lbf (53 kN). The pressure ratio would be an unheard of 9:1.[8] To achieve this, the initial design used a low-pressure (LP) axial compressor and a high-pressure (HP) centrifugal compressor, each being driven by its own single-stage turbine. This two-spool design eliminated the need for features such as variable inlet guide vanes (Avon, J79), inlet ramps (J65), variable stators (J79) or compressor bleed (Avon) which were required on single spool compressors with pressure ratios above about 6:1. Without these features an engine could not be started nor run at low speeds without destructive blade vibrations. Nor could they accelerate to high speeds with fast acceleration times ("spool up") without surge.[9] The design was progressively modified and the centrifugal HP compressor was replaced by an axial HP compressor. This reduced the diameter of the new engine to the design specification of 40 in (100 cm). The Bristol Type 172 was cancelled though development continued for the Avro Vulcan and other projects.[10]

Initial Development

Gas-flow diagram of Olympus Mk 101

The first engine, its development designation being BOl.1 (Bristol Olympus 1), had six LP compressor stages and eight HP stages, each driven by a single-stage turbine. The combustion system was novel in that ten connected flame tubes were housed within a cannular system: a hybrid of separate flame cans and a true annular system. Separate combustion cans would have exceeded the diameter beyond the design limit, and a true annular system was considered too advanced.[11]

In 1950, Dr (later Sir) Stanley Hooker was appointed as Chief Engineer of Bristol Aero Engines.[11]

The BOl.1 first ran on 16 May 1950 and was designed to produce 9,140 lbf (40.7 kN) thrust and to be free from destructive rotating stall on start up to idle speed and to be free from surging on fast accelerations to maximum thrust. The engine started without a problem and Hooker, supervising the first test run and displaying the confidence he had in the design, slammed the throttle to give a surge-free acceleration to maximum power.[12] The thrustmeter showed 10,000 lbf (44 kN).[13] The next development was the BOl.1/2 which produced 9,500 lbf (42 kN) thrust in December 1950. Examples of the similar BOl.1/2A were constructed for US manufacturer Curtiss-Wright which had bought a licence for developing the engine as the TJ-32 or J67. The somewhat revised BOl.1/2B, ran in December 1951 producing 9,750 lbf (43.4 kN) thrust.[14] The engine was by now ready for air testing and the first flight engines, designated Olympus Mk 99, were fitted into a Canberra WD952 which first flew with these engines derated to 8,000 lbf (36 kN) thrust in August 1952. In May 1953, this aircraft reached a world record altitude of 63,668 ft (19,406 m).[15] (Fitted with more powerful Mk 102 engines, the Canberra increased the record to 65,876 ft (20,079 m) in August 1955.[16])

Variants

Preserved Bristol Olympus 101.
BOl.1/2A
BOl.1/2B
BOl.1/2C
BOl.2
BOl.3
Of all the early initial developments, BOl.2 to BOl.5 (the BOl.5 was never built[17]), perhaps the most significant was the BOl.3. Even before the Vulcan first flew, the Olympus 3 was being suggested as the definitive powerplant for the aircraft. In the event, the 'original' Olympus was continuously developed for the Vulcan B1. The BOl.3 was described in 1957 as "a high-ended product intermediate between the Olympus 100 and 200 series."[18]
BOl.4
BOl.5
not built
BOl.6
(Mk.200)
BOl.7
(Mk.201)
BOl.7SR
BOl.11
(Mk.102)
BOl.12
(Mk.104)
BOl.21
(Mk.301)
BOl.21R
not built, proposed for R.A.E. Missile (A) designed to meet O.R. 1149 issued May 1956.[19]
BOl.22R
(Mk.320)
BOl.23
not built, proposed with a 301 compressor, 22R turbine and reheat to give 25,000 lb at take-off (reheat).[20]
Olympus Mk 100
(BOl.1/2B) Similar to Olympus Mk 99 rated at 9,250 lbf (41.1 kN) thrust for second Vulcan prototype VX777. First flew September 1953.[21][N 1]
Olympus Mk 101
(BOl.1/2C) Larger turbine, 11,000 lbf (49 kN) thrust for initial production Vulcan B1 aircraft. First flew (XA889) February 1955.[22]
Olympus Mk 102
(BOl.11) Additional zero stage on LP compressor, 12,000 lbf (53 kN) thrust for later production Vulcan B1 aircraft.[24]
Olympus Mk 104
(BOl.12) Designation for Olympus Mk 102 modified on overhaul with new turbine and burners, 13,000 lbf (58 kN) thrust initially, 13,500 lbf (60 kN) thrust on uprating,[24] standard on Vulcan B1A.[25]
'Olympus 106'
Used to describe the development engine for the Olympus 200 (BOl.6).[26][27] Possibly a corruption of BOl.6 (Olympus 6).
Olympus Mk 97
This early engine tested an early annular combustion chamber. It was test flown on Bristol's Avro Ashton test bed WB493.[28]
Olympus Mk 201
(BOl.7) Uprated Olympus Mk 200. 17,000 lbf (76 kN) thrust. Initial Vulcan B2 aircraft.[29]
Olympus Mk 202
Disputed. Either Olympus Mk 201 modified with rapid air starter,[30] or Olympus Mk 201 with redesigned oil separator breathing system.[31] This was the definitive '200 series' engine fitted to Vulcans not fitted with the Mk 301. The restored Vulcan XH558 is fitted with Olympus Mk 202 engines.[32]
'Olympus Mk 203'
Very occasional reference to this elusive mark of engine can be found in some official Air Publications relating to the Vulcan B2. It is also noted in a manufacturer's archived document dated circa 1960.[33]
Olympus Mk 301
(BOl.21) Additional zero stage on LP compressor. 20,000 lbf (89 kN) thrust.[34] Later Vulcan B2 aircraft plus nine earlier aircraft[N 2] retrofitted.[35] Later derated to 18,000 lbf (80 kN) thrust.[36] Restored to original rating for Operation Black Buck.[37]
Olympus 510 series
With a thrust in the region of 15,000 lbf (67 kN) to 19,000 lbf (85 kN), the 510 series were civilianised versions of the BOl.6.[38] A team was sent to Boeing at Seattle to promote the engine in 1956 but without success.[39]
Olympus 551
The Olympus 551 'Zephyr' was a derated and lightened version of the BOl.6 and rated at 13,500 lbf (60 kN) thrust. The engine was the subject of a licence agreement between Bristol Aero Engines and the Curtiss-Wright Corporation - the engine being marketed in the US as the Curtiss-Wright TJ-38 Zephyr. There were hopes to fit the Olympus 551 to the Avro Type 740 and Bristol Type 200 trijet airliners which did not progress beyond the project stage. Curtiss-Wright also failed to market the engine.[40]
Olympus Mk 320 at the RAF Museum, Cosford.
Mk.320
The performance specification for the BAC TSR-2 was issued in 1962. It was to be powered by two BSEL Olympus Mk 320 (BOl.22R) engines each rated at 19,610 lbf (87.2 kN) dry and 30,610 lbf (136.2 kN) with reheat at take-off. The engine, which was re-stressed for supersonic flight at sea level, and over Mach 2.0 at altitude, and featured much use of high-temperature alloys such as titanium and Nimonic,[41] was a cutting edge derivative of the Olympus Mk 301 with a Solar-type afterburner.[42] The engine first ran in March 1961, soon achieving 33,000 lbf (150 kN),[41] and was test flown in February 1962 in an underslung nacelle in the belly of Vulcan B1 XA894 and was demonstrated at the Farnborough Air Show in September. In December 1962 during a full power ground run at Filton, the LP shaft failed. The liberated turbine disc ruptured fuel tanks and the subsequent fire completely destroyed the Vulcan.[43]
On its first flight in September 1964 the engines of the TSR-2 were scarcely flightworthy being derated and cleared for one flight. Nevertheless, the risk was deemed acceptable in the political climate of the time. With new engines, the TSR-2 XR219 flew another 23 times before the project was cancelled in 1965.[44]
Olympus 593
The Rolls-Royce/Snecma Olympus 593 was a reheated version of the Olympus which powered the supersonic airliner Concorde.[45] The Olympus 593 project was started in 1964, using the TSR2's Olympus Mk 320 as a basis for development.[46] BSEL and Snecma Moteurs of France were to share the project.[45] Acquiring BSEL in 1966, Rolls-Royce continued as the British partner.[47]
593D
Formerly Olympus 593. 28,100 lbf (125 kN) thrust.[46] (the 'D' in the engine designation equalling 'derivation' - for smaller, short-range version of Concorde that was later cancelled)[48]
593B
Flight test and prototype aircraft. 34,370 lbf (152.9 kN) thrust with reheat. (the 'B' in the engine designation equalling 'big' - for long-range Concorde that subsequently entered service) [49][50]
593-602
Production. Annular combustion chamber to reduce smoke[51]
593-610
Last production. 38,075 lbf (169.37 kN) thrust with reheat.[52]
Curtiss-Wright TJ-32
Examples of the BOl.1/2A were delivered to Curtiss-Wright in 1950. The engine was Americanised during 1951 and flew under a Boeing B-29 testbed as the TJ-32.
Curtiss-Wright J67
To meet a USAF demand for an engine in the 15000 lb thrust class, the engine was the subject of a development contract, redesigned and designated J67. Development was protracted and in 1955, the USAF announced that there would be no production contract for the present J67. Several aircraft had been intended to receive the J67 including the Convair F-102 Delta Dagger.[53]
Curtiss-Wright T47
The T47 was an attempt to produce a turboprop based upon the J67.[54]
TJ-38 Zephyr
See Olympus 551 (above).
Avro Vulcan XJ784 at CFB Bagotville in 1978. It is powered by four Olympus Mk 301 engines, identified by their shorter and wider jet pipe nozzles.[55]

Variant notes

Second-generation Engines
The initial design of the second-generation 'Olympus 6' began in 1952. This was a major redesign with five LP and seven HP compressor stages and a canullar combustor with eight interconected flame tubes. In spite of a much greater mass flow, the size and weight of the BOl.6 was little different from earlier models.[56]

Rival manufacturers Rolls-Royce lobbied very hard to have its Conway engine installed in the Vulcan B2 to achieve commonality with the Victor B2. As a consequence, Bristol undertook to complete development using company funds and peg the price to that of its fully government-funded rival.[39]

Olympus Mk 200
(BOl.6) 16,000 lbf (71 kN) thrust. First B2 (XH533) only.[29]
Civilianised Olympus
Plans to civilianise the Olympus go back as far as 1953 with the unveiling of the Avro Atlantic airliner based upon the Vulcan.[57] However, most of the civilian derivatives, except for supersonic airliners, were developed from the BOl.6.
Thin-wing Javelin
One project that got beyond the drawing board was a supersonic development of the Gloster Javelin, the P370, powered by two BOl.6, 7, or 7SR engines. The design evolved into the P376 with two BOl.21R engines rated at 28,500 lbf (127 kN) with reheat. Eighteen aircraft were ordered in 1955. The project was abandoned the following year.[58]
Afterburning Olympus
As early as 1952, Bristol had considered the use of reheat, or afterburning, to augment the thrust of the Olympus. Initially, a system called Bristol Simplifed Reheat was devised which was tested on a Rolls-Royce Derwent V mounted in an Avro Lincoln. Later it was tested on an Orenda engine in Canada and on an Olympus Mk 100 in the Avro Ashton test bed.[59] Fully variable reheat became possible after an agreement with the Solar Aircraft Company of San Diego which manufactured bench units for the Olympus Mks 101 and 102.[59] An afterburning Olympus was just one proposal for the Vulcan Phase 6, a 350,000 lb aircraft with a 13/14 hour endurance.[20]
Olympus driving aft fan
BS.81 rated at 28,000lb. As an alternative to afterburning a fan mounted at the trailing edge of the wing was proposed for the Vulcan Phase 6. The fan was driven by a turbine in the engine exhaust at the end of the jetpipe.[60]
Vectored thrust Olympus
A vertical take-off Vulcan was proposed in 1960. It used 4 vectored-thrust Olympus as well as 10 lift engines.[61]

Derivatives

Industrial power generation

The Olympus entered service as a peak demand industrial power generator in 1962 when the Central Electricity Generating Board (CEGB) commissioned a single prototype installation at its Hams Hall power station. Power was provided by an Olympus 201 exhausting through a two-stage turbine powering a Brush synchronous alternator providing 20 MW at 3000 rpm. By 1972, the CEGB had installed 42 Olympus generating sets.[62] Olympus engines are also used to provide backup power in case of a loss of grid electrical power at some of Britain's nuclear power stations.

Many sets were exported and many found use on offshore platforms. By 1990, over 320 sets had been sold to 21 countries,[45] many of which remain in service.

Applications

Proposed aircraft applications

Over the years, the Olympus was proposed for numerous other applications including:

Engines on display

Specifications Olympus 101

Data from The Operational Olympus Flight and Lecture Notes, Vulcan Bristol Aero Engine School

General characteristics

Components

Performance

Specifications Olympus 301

Data from flightglobal

General characteristics

Components

Performance

See also

Related development

Comparable engines
Related lists

References

Notes
  1. ↑ VX777 was retrofitted with Mk 101,[22] Mk 102 and Mk 104[23] engines.
  2. ↑ XH557 (flight test), XJ784 (certification), XL384-390 (retrofit programme)
Citations
  1. ↑ "The Rolls-Royce Olympus Aircraft Engine". Air Power World. Retrieved 13 September 2016.
  2. ↑ "Rolls-Royce Olympus". Gatwick Aviation Museum. Retrieved 13 September 2016.
  3. ↑ Baxter 2012, p. 16
  4. ↑ http://www.flightglobal.com/pdfarchive/view/1955/1955%20-%201748.html
  5. ↑ Baxter 2012, p. 20
  6. ↑ Baxter 1990, pp. 10–13
  7. ↑ Baxter 1990, pp. 13, 18
  8. ↑ Baxter 1990, p. 13
  9. ↑ http://webserver.dmt.upm.es/zope/DMT/Members/jmtizon/turbomaquinas/NASA-SP36_extracto.pdf p.44 and fig.27a
  10. ↑ Baxter 1990, pp. 16, 18
  11. 1 2 Baxter 1990, p. 18
  12. ↑ "Not Much Of An Engineer" Sir Stanley Hooker, The Crowood Press Ltd. 2002, ISBN 9780906393352, p.142
  13. ↑ "World Encyclopedia of Aero Engines - 5th edition" by Bill Gunston, Sutton Publishing, 2006, p36
  14. ↑ Baxter 1990, p. 20
  15. ↑ Baxter 1990, pp. 22, 24
  16. ↑ Baxter 1990, p. 32
  17. ↑ Baxter 1990, p. 173
  18. 1 2 Arrow Flight 25 October 1957, p. 647
  19. ↑ Fildes 2012, p. 397
  20. 1 2 Fildes 2012, p. 408
  21. ↑ Baxter 1990, p. 42
  22. 1 2 Baxter 1990, p. 44
  23. ↑ MOS Air Fleet Record of Aircraft Movements
  24. 1 2 Baxter 1990, p. 46
  25. ↑ Pilots Notes AP 4505C—PN
  26. ↑ Bristol Olympus Flight 9 December 1955, p. 876
  27. ↑ Blackman 2007, p. 101
  28. ↑ Baxter 1990, p. 33
  29. 1 2 Baxter 1990, p. 50
  30. ↑ Baxter 1990, p. 66
  31. ↑ Air Publication 101B-1902-1A Vulcan B Mk.2 Aircraft Servicing Manual Cover 2, Sect 4, Chap 1, AL 86, Sept '72, Para 54A.
  32. ↑ "CAA Airworthiness Approval Note 27038" (PDF). section 5.2.4 Engines.
  33. ↑ Archives of the National Archive, PA1716/5/11/3/5.
  34. ↑ Baxter 1990, p. 58
  35. ↑ Bulman 2001, pp. 149 & 150
  36. ↑ Aircrew Manual AP101B-1902-15 Prelim, p. 10
  37. ↑ Baxter 1990, p. 70
  38. ↑ Aero Engines 1957 Flight 26 July 1957, p. 114
  39. 1 2 Baxter 1990, p. 36
  40. ↑ Baxter 1990, pp. 36–40
  41. 1 2 "World Encyclopedia of Aero Engines - 5th edition" by Bill Gunston, Sutton Publishing, 2006, p. 38
  42. ↑ Baxter 1990, pp. 78, 80
  43. ↑ Baxter 1990, pp. 80–86
  44. ↑ Baxter 1990, pp. 96–100
  45. 1 2 3 Baxter 1990, p. 131
  46. 1 2 Baxter 1990, p. 135
  47. ↑ Baxter 1990, p. 11
  48. ↑ http://www.flightglobal.com/pdfarchive/view/1966/1966%20-%200036.html
  49. ↑ Baxter 1990, p. 149
  50. ↑ http://www.flightglobal.com/pdfarchive/view/1966/1966%20-%200080.html
  51. ↑ Baxter 1990, p. 153
  52. ↑ Baxter 1990, p. 165
  53. ↑ Bristol Olympus Flight 9 December 1955, p. 875
  54. ↑ Aero Engines 1954 Flight 9 April 1954, p. 462
  55. ↑ Bulman 2001, p. 146
  56. ↑ 16,000 lb Thrust Flight 15 February 1957, p. 200
  57. ↑ Baxter 1990, p. 40
  58. ↑ Baxter 1990, pp. 28 & 172
  59. 1 2 Baxter 1990, p. 26
  60. 1 2 Fildes 2012, p. 407
  61. ↑ Fildes 2012, p. 413
  62. ↑ Baxter 1990, pp. 110–123
  63. 1 2 3 4 Avro Type List Avro Heritage
  64. ↑ Fildes 2012, p. 424
  65. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Baxter 1990, p. 172
  66. ↑ Addendum to Avro Brochure IPB 104
  67. ↑ Wikipedia article quoting Berns, Lennart A36 - SAABs atombombare avslöjad, Flygrevyn issue #4, April 1991
  68. ↑ Historien om Viggen Protec 2005 No 4
Bibliography
  • Baxter, Alan. Olympus — the first forty years. Derby, UK: Rolls-Royce Heritage Trust, 1990. ISBN 978-0-9511710-9-7
  • Blackman, Tony. Vulcan Test Pilot. London, UK: Grub Street, 2009. ISBN 978-1-906502-30-0
  • Bullman, Craig. The Vulcan B.Mk2 from a Different Angle. Bishop-Auckland, UK: Pentland Books, 2001. ISBN 1-85821-899-3
  • Fildes, David W. The Avro Type 698 Vulcan"Barnsley, UK: Pen % Sword Aviation, 2012, ISBN 978 1 84884 284 7
  • Hooker, Stanley. Not Much of an Engineer. Marlsborough, UK: Airlife Publishing, 2002. ISBN 978-1-85310-285-1
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