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Encyclopedia > Allison 250
MTU build Allison 250-C20B

The Rolls-Royce Model 250 is a highly successful turboshaft/turboprop engine family, originally started by a General Motors offshoot, the Allison Engine Company, in the early 60's. MTU Aero Engines, Germanys leading aircraft engine manufacturer, develops, manufactures and provides service support for aircraft engines, military and civil alike. ... This article is about the company. ... The Allison Engine Company was an aircraft engine manufacturer that was acquired by Rolls-Royce in 1995. ...


Allison adopted a rather unusual "trombone" style of engine configuration for the Model 250: although air enters the intake/compression system in the conventional fashion, the compressed air leaving the centrifugal compressor diffuser is ducted rearwards around the turbine system, before being turned through 180 degrees at entry to the combustor; the combustion products expand through the 2-stage HP turbine, which is connected, via the HP shaft, to the compression system, before expanding through through the 2-stage power turbine; the exhaust gases then turn though 90 degrees to exit the engine in a radial direction; a stub shaft connects the power turbine to a compact reduction gearbox, located inboard, between the centrifugal compressor and the exhaust/power turbine system. The engine configuration is shown clearly in http://helicopterflight.net/engine1.jpg.


One of the latest versions of the Model 250 is the -C40, which has a hi-tech centrifugal compressor pulling a pressure ratio of 9.2:1, at an airflow 6.1lb/s, and developing 715shp.


Some of the earlier versions have axial compressor stages mounted on the HP shaft to supercharge a relatively low pressure ratio centrifugal compressor. The -C20R is typical, pulling an overall pressure ratio of 8.0:1, at an airflow of 4.0lb/s, with a power output of 450shp.


As the following site shows (http://www.atlasaviation.com/powerplant/aircraftapp.htm), the Model 250 propels a large number of helicopters and small aircraft. As a result, nearly 30,000 Model 250 engines have been produced. Of these, approximately 16,000 remain in service. The Model 250 is one of the highest-selling engines made by Rolls-Royce.


Oldler retired units have also had a second life as theatrical props as engines for Colonial Vipers that are being worked on in the background of the port Hangar bay on the Sci FI channel remake of Battlestar Galactica.

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Rolls-Royce Ltd/Rolls-Royce plc aero-engines

Piston engines
Buzzard · Condor · Crecy · Eagle · Eagle 22 · Exe · Falcon · Goshawk · Griffon · Hawk · Kestrel · Merlin · Pennine · Peregrine · "R" · Vulture
Rolls-Royce Limited was a British car and aero-engine manufacturing company founded by Henry Royce and C.S. Rolls in 1906 and was the result of a partnership formed in 1904. ... Rolls-Royce plc is a British aircraft engine maker; the second-largest in the world, behind General Electric Aviation. ... The Rolls-Royce Buzzard was an aero engine of 36. ... The Rolls-Royce Condor was a larger version of the Rolls-Royce Eagle developing upto 675 hp. ... The Rolls-Royce Crecy was a 2-stroke 90 degree V12 liquid cooled aero engine of 26. ... The Rolls-Royce Eagle V12 was a 12 cylinder 60 degree V12 aero engine of 20 Liters capacity. ... The Rolls-Royce Eagle 22 was a 24 cylinder sleeve valve aero engine of 46. ... The Rolls-Royce Falcon was an aero-engine developed in 1915. ... The Rolls-Royce Goshawk was a development of the Rolls-Royce Kestrel featuring evaporative cooling. ... Rolls-Royce Griffon The Rolls-Royce Griffon was a 2,240 in³ (36. ... The Rolls-Royce Hawk was produced between 1915 and 1918 consisting of one bank of six cylinders from the Rolls-Royce Eagle. ... The Kestrel was a 700 hp (520 kW) V-12 aircraft engine from Rolls-Royce, their first cast-block engine and the pattern for most of their future piston-engine designs. ... The Merlin was a 12 cylinder, 60° V, 27 litre, liquid cooled piston aircraft engine built during World War II by Rolls-Royce and under licence in the United States by Packard. ... The Peregrine was a 885hp liquid-cooled V-12 aircraft engine designed by Rolls Royce in the early 1930s. ... The Rolls-Royce R was a racing aero engine. ... The Rolls-Royce Vulture (and the related Peregrine) were aircraft engines, and probably the least successful power units ever produced by Rolls-Royce. ...


Turbojets
Avon · Derwent · Nene · Olympus · RB106 / Thames · RB108 · Soar · Tay · Welland
The Rolls-Royce Avon turbojet was developed by Cyril Lovesey who had previously been in charge of Merlin development at Rolls-Royce. ... The Derwent was the second jet engine design to be put into production by Rolls-Royce. ... The Nene or RB.41, was Rolls-Royces third jet engine to enter production, designed and built in an astonishingly short five month period in 1944, first running on October 27th, 1944. ... Rolls-Royce Olympus 593 The Olympus is a high-powered axial-flow turbojet, originally developed at Bristol Aero Engines, later passed to Bristol Siddeley, and finally to Rolls-Royce. ... The Rolls-Royce RB.106 was an advanced military turbojet engine design of the 1950s by Rolls Royce Ltd. ... The Short SC.1 used five RB.108s - the four lift engines are mounted vertically amidships in a cluster under the dark-coloured grilles whilst the fifth RB.108 is angle-mounted at the rear for forward propulsion The Rolls-Royce RB.108 was a jet engine designed by Rolls... The Rolls-Royce Soar was a small, expendable axial-flow turbojet intended for cruise missile use. ... The Rolls-Royce Tay was essentially an (optionally) afterburning version of the Nene, aimed at the same military market that the Nene served. ... The Welland was Englands first production jet engine. ...


Turbofans
Adour · AE 3007 · BR700 · Conway · F136 · Pegasus · RB199 · RB211 · RB401 · Spey · Tay · Trent
RAF Jaguars Adour The Adour jet engine is a two-shaft turbofan developed by Rolls-Royce/Turbomeca, a joint subsidiary of Rolls-Royce (UK) and Turbomeca (France). ... The AE 3007 is a turbofan engine produced by Rolls-Royce. ... The BR700 family of engines was developed by BMW and Rolls-Royce plc through the joint venture company BMW Rolls-Royce to power regional and corporate jets. ... The Rolls-Royce Conway was the first by-pass engine to go into service in the world. ... The General Electric/Rolls-Royce Fighter Engine Team is developing the F136 advanced fighter engine designed specifically for the Joint Strike Fighter. ... Rolls-Royce Pegasus The Rolls Royce Pegasus is a turbofan engine manufactured by Rolls-Royce plc. ... RB199s of Tornado F3 The Turbo Union RB199 is an aircraft jet engine designed and built jointly by Rolls-Royce, MTU and FiatAvio (now Avio). ... RB211 powered Lockheed L-1011 The Rolls Royce RB.211 family is a family of high-bypass turbofan aircraft engines made by Rolls-Royce capable of generating 37,400 to 60,600 pounds-force (166 to 270 kilonewtons) thrust. ... The RB401 was a business jet engine which Rolls-Royce started to develop in the mid-1970s. ... The Spey is a low-bypass turbofan engine from Rolls-Royce that has been in widespread service for over 30 years. ... Tay 650-15 installed on an Air Bagan Fokker F100 Tay 650-15 installed on an Air Bagan Fokker F100 The Rolls-Royce RB.183 Tay is a development of the RB.163 civil Spey, using the low-pressure components from the famous RB.211 to produce a version with... Rolls-Royce Trent 900 on A380 prototype Rolls Royce Trent is a family of high-bypass turbofan engines manufactured by Rolls-Royce. ...


Turboshafts / Turboprops
AE 1107C-Liberty · AE 2100 · Clyde · Dart · Gem · Gnome · Model 250 · MTR390 · RTM322 · T56 · Trent · Tyne The Rolls-Royce AE 1107C-Liberty (also known as Allison T406) is a turboshaft engine which powers the Boeing V-22 Osprey. ... Developed by Allison Engine Company, now part of Rolls-Royce North America, the AE 2100 is a turboprop derivative of the Allison T406 (Rolls-Royce AE 1107C-Liberty) turboshaft engine, and shares the same high-pressure core as the engine, as does the Rolls-Royce AE 3007. ... The Clyde, or RB39, was Rolls-Royces first purpose-designed turboprop engine. ... The Rolls Royce Dart was a long-lived turboprop engine. ... Please wikify (format) this article or section as suggested in the Guide to layout and the Manual of Style. ... The Rolls-Royce Gnome is a single spool turboshaft originally developed by De Havilland Engine Company from a General Electric design. ... The MTR390 is a turboshaft developed for light helicopter applications by an alliance of three European aero-engine manufacturers, MTU, Turbomeca and Rolls-Royce. ... An Advanced turboshaft, the RTM322, produced by Rolls-Royce/Turbomeca Ltd. ... The T56 is a military turboprop engine produced by Rolls-Royce. ... The first Trent - a Rolls-Royce RB.50 Trent on a test rig at Hucknall, in March 1945 The Rolls-Royce Trent or RB.50 (for Rolls-Barnoldswick, after the Barnoldswick manufacturing plant) was the worlds first turboprop engine. ... The Rolls-Royce Tyne was a 2 shaft turboprop developed in the late 1950s, primarily for the Vickers Vanguard airliner, but also later for the Dassault-Breguet Atlantique long-range reconnaissance aircraft, Canadair CL-44 and Transport Allianz Transall transport aircraft. ...


  Results from FactBites:
 
Allison 250-C18 T63-700 Gas Turbine Engine (500 words)
The Allison 250 is fitted to numerous aircraft including the ubiquitous Bell/Textron Jet Ranger- one of the worlds most successful Helicopters.
The 250 is not without it's flaws, the engine is very complicated in construction and is also relatively fragile.
The 250 is used as a Helicopter engine and a Turboprop engine, the differences are mainly in the gearbox output arrangements, the control system and the engine orientation.
Common maintenance events on the Allison 250 C20 @ AMTOnline.com (7455 words)
Evidence of oil spraying out of the bleed valve of an Allison 250 C20 engine should lead you to suspect an oil leak from the carbon seal for the No. 1 bearing at the front of the compressor.
To split a Allison 250 C20 gearbox, the gearbox cover or aft portion is lifted off of the housing or front half.
Allison recommends this clearance to be within 0.0005 to 0.0015 inch.
  More results at FactBites »


 

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