293:
turbine system, before the air is turned through 180 degrees at entry to the combustor. The combustion products expand axially forward through the two-stage (single-stage on early engines) high-pressure turbine section, which is connected to the compressor via the HP shaft. The combustion products continue to expand through the two-stage power turbine which generates shaft horsepower for the aircraft. A coaxial stub shaft connects the power turbine to a compact reduction gearbox, located inboard, between the centrifugal compressor and the exhaust/power turbine system. The exhaust stream then turns through 90 degrees to exit the engine in a radial direction through twin exhaust ducts, which form a V-shape seen in the front elevation.
198:. At this stage the US Army was unsure whether to have a fixed- or rotary-wing aircraft, so Allison was instructed to consider both applications. Design studies undertaken considered a wide range of possible mechanical configurations for the turboprop/turboshaft. These studies culminated in the testing of the first prototype engine, designated YT63-A-3, in April 1959. In 1960, the US Army settled for a rotary wing platform. The YT63-A-3 first flew in a variant of the
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Earlier versions have seven axial compressor stages mounted on the HP shaft to supercharge a relatively low-pressure-ratio centrifugal compressor. The -C20B is typical, with an overall pressure ratio of 7.2:1, at an airflow of 3.45 lb/s (1.8 kg/s), with a power output, at the shaft, of
292:
Allison adopted a reverse-airflow 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 ported rearwards via two transfer pipes, which go around the outside of the
296:
An important design feature of the Model 250 engine is its modular construction which greatly simplifies maintenance and repair activity. Also the unique reverse-flow design provides for ease of hot section maintenance. There are four modules:
318:
One of the latest versions of the Model 250 is the -C40, which has only a centrifugal compressor producing a pressure ratio of 9.2:1, at an airflow of 6.1 lb/s (2.8 kg/s), and develops, at the shaft, 715 hp (533 kW).
202:
helicopter in 1961. A modified version of the engine (YT63-A-5) with the exhaust pointing upwards (to avoid grass fires) soon followed. This version, rated at 250 hp, passed the Model
Qualification Test in September 1962. The
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218:). As a result, nearly 30,000 Model 250 engines have been produced, of which approximately 16,000 remain in service, making the Model 250 one of the highest-selling engines made by Rolls-Royce.
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Allison division of
General Motors was chosen by the US Army to develop a new light turbine engine to power a "Light Observation Aircraft" (LOA), to replace the
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Used aboard marine ships as a starter system for larger gas turbines. RIMSS, Redundant
Independent Mechanical Start System
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317 hp (236 kW) for take-off, Sea Level 59 °F (15 °C) NH 51,600rpm NL 35,000rpm Nout 6,000rpm
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Light
Observation Helicopter in 1967. 185 lb (84 kg) engine delivering 280 hp (210 kW).
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Typically 2x 250-C20S driving a single propeller via a combining gearbox, able to operate individually.
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in the early 1960s. The Model 250 has been produced by Rolls-Royce since it acquired
Allison in 1995.
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The Model 250 powers a large number of helicopters, small aircraft and even a motorcycle (
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RIMSS, Redundant
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474:. First regenerative engine to fully power a VTOL aircraft in flight. Ran on a
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A partially sectioned
Allison 250-C20B is on public display at the
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1100:"Allison regenerative engine first to 'go it alone' in flight"
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1048:"Atlas Aviation - rolls royce allison model 250 application"
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design, powered by the T63, was selected for the US Army
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Partenavia AP.68TP variants - Spartacus & Viator
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1154:. Monterey California: Naval Postgraduate School.
307:turbine module (including V-shaped exhaust ports)
941:1,380 °F (750 °C)@Power Turbine Inlet
866:6-stage axial + 1-stage centrifugal compressors
1805:
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301:compressor module, at the front of the engine
8:
304:gearbox module (including accessory drives)
260:. Unsourced material may be challenged and
178:engine family, originally developed by the
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1098:McCardle, John J., ed. (20 October 1967).
280:Learn how and when to remove this message
2795:Rolls-Royce aircraft gas turbine engines
812:Specifications Model 250-C18 (T63-A-700)
1106:. Vol. 27, no. 8. p. 1.
993:
1032:: CS1 maint: archived copy as title (
1025:
31:
555:Britten-Norman BN-2T Turbine Islander
107:Britten-Norman BN-2T Turbine Islander
7:
774:Gerhardt 66, USAC Indycar racing car
258:adding citations to reliable sources
616:Soloy Cessna 206 turbine conversion
25:
893:aviation kerosene (alternatively
470:Experimental engine containing a
1775:Rolls-Royce Limited aero engines
1247:
737:Northrop Grumman MQ-8 Fire Scout
230:
40:
1130:City of Norwich Aviation Museum
907:pressure spray/splash, dry sump
801:City of Norwich Aviation Museum
732:MD Helicopters MH-6 Little Bird
1769:Joint development aero engines
1169:Rolls-Royce M250 Official page
853:138.5 lb (63 kg) dry
1:
1424:Joint development aeroengines
950:0.697 lb/hp·h (0.424 kg/kW·h)
875:Single can combustion chamber
1823:gas turbine aircraft engine
1150:Haas, David William (1996).
841:40.5 in (1,029 mm)
166:, (US military designations
1709:Aero-derivative industrial
472:regenerative heat exchanger
315:420 hp (310 kW).
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1779:Rolls-Royce Heritage Trust
939:Turbine inlet temperature:
847:22.5 in (572 mm)
27:Turboshaft aircraft engine
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1420:
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959:2.289 hp/lb (3.765 kW/kg)
946:Specific fuel consumption
805:Horsham St Faith, Norfolk
562:Silver Eagle (conversion)
502:420 hp (310 kW)
496:317 hp (236 kW)
389:420 hp (310 kW)
374:317 hp (236 kW)
368:317 hp (236 kW)
174:) is a highly successful
48:
39:
34:
2790:1960s turboshaft engines
2785:Allison aircraft engines
692:Fairchild Hiller FH-1100
52:-built Allison 250-C20B
2780:1960s turboprop engines
825:General characteristics
606:SIAI-Marchetti SF.260TP
517:Licence production for
2736:Adaptive cycle engines
1821:United States military
1678:Other fan-type engines
1210:Allison Engine Company
1174:Video of running model
925:Overall pressure ratio
611:SIAI-Marchetti SM.1019
551:(Prop-jet conversions)
539:Aermacchi M-290 RediGO
180:Allison Engine Company
87:Allison Engine Company
955:Power-to-weight ratio
918:Maximum power output:
784:MTT Turbine Superbike
727:MD Helicopters MD 600
722:MD Helicopters MD 500
216:MTT Turbine Superbike
111:MD Helicopters MD 500
1464:Rolls-Royce Holdings
521:/ OH-6A helicopters.
254:improve this section
196:Cessna O-1A Bird Dog
1767:Symbol ‡ indicates
1760:Symbol † indicates
1078:www.rolls-royce.com
969:Related development
935:3.3 lb/s (1.5 kg/s)
780:, non-rigid airship
752:Schweizer 330/330SP
519:Kawasaki-Hughes 500
162:, now known as the
1825:designation system
794:Engines on display
769:Other applications
702:Hughes OH-6 Cayuse
549:Beechcraft Bonanza
544:BAE Systems Mantis
98:Major applications
2767:
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1054:on 24 August 2006
1014:on 4 October 2016
980:Rolls-Royce RR500
975:Rolls-Royce RR300
508:Soloy Turbine-Pac
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160:Allison Model 250
156:
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151:Rolls-Royce RR500
139:Rolls-Royce RR300
16:(Redirected from
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1074:"Press releases"
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1050:. Archived from
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1007:. Archived from
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661:Bell OH-58 Kiowa
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1126:"Engines List"
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806:
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785:
782:
779:
776:
773:
772:
768:
763:
762:Sikorsky S-76
760:
758:
755:
753:
750:
748:
745:
743:
740:
738:
735:
733:
730:
728:
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579:
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556:
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531:
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520:
516:
513:
510:
507:
504:
501:
498:
495:
492:
489:
486:
483:
480:
477:
476:Hughes YOH-6A
473:
469:
466:
463:
460:
457:
454:
451:
448:
445:
442:
439:
436:
433:
430:
427:
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379:
376:
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303:
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273:
263:
259:
255:
249:
248:
244:
239:This section
237:
233:
228:
227:
221:
219:
217:
212:
211:in May 1965.
210:
206:
201:
197:
193:
190:In 1958, the
185:
183:
181:
177:
173:
169:
165:
161:
152:
149:
144:
143:
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137:
134:
133:
129:
124:
123:
120:
119:Sikorsky S-76
116:
112:
108:
104:
101:
96:
95:
92:
88:
85:
83:Manufacturer
82:
81:
78:
77:United States
75:
70:
69:
66:
62:
59:
56:
55:
51:
47:
43:
38:
33:
30:
19:
2438:
2307:
1713:gas turbines
1627:
1549:Trent series
1469:and aircraft
1467:aero engines
1336:
1151:
1145:
1133:. Retrieved
1129:
1120:
1103:
1093:
1081:. Retrieved
1077:
1068:
1056:. Retrieved
1052:the original
1042:
1016:. Retrieved
1009:the original
996:
984:
968:
967:
953:
944:
938:
932:
923:
917:
904:
887:
878:
869:
863:
850:
844:
838:
830:
819:
816:
815:
786:, motorcycle
707:Kamov Ka-226
676:Cicaré CH-14
630:Agusta A109A
591:Grob G 120TP
566:Extra EA-500
527:Applications
317:
313:
295:
291:
276:
267:
252:Please help
240:
213:
189:
171:
167:
163:
159:
157:
126:Number built
29:
2140:Turboshafts
1711:and marine
1604:Turboshafts
1539:Spey Junior
1329:Turboshafts
912:Performance
905:Oil system:
864:Compressor:
851:Dry weight:
778:Loral GZ-22
681:Enstrom 480
671:Boeing AH-6
623:Rotary-wing
560:Cessna P210
505:T703-AD-700
443:250-C30R/3M
205:Hughes OH-6
186:Development
130:>30,000
2774:Categories
2454:LHTEC T800
2135:Turboprops
1700:LiftSystem
1600:Turboprops
1583:Trent 7000
1573:Trent 1000
1325:Turboprops
1104:AllisoNews
1058:9 November
988:References
888:Fuel type:
871:Combustors
858:Components
834:Turboshaft
717:MBB Bo 108
712:MBB Bo 105
666:Bell YOH-4
532:Fixed-wing
440:250-C30R/3
428:250-C30G/2
401:250-C20R/4
398:250-C20R/2
395:250-C20R/1
359:250-B17F/2
356:250-B17F/1
176:turboshaft
115:MBB Bo 105
61:Turboshaft
2479:Turbofans
1833:Turbojets
1773:See also
1578:Trent XWB
1568:Trent 900
1563:Trent 800
1558:Trent 700
1553:Trent 500
1489:Advance 3
1484:Advance 2
1476:Turbofans
1291:Turbofans
1258:Turbojets
1221:V engines
1135:27 August
845:Diameter:
817:Data from
742:PZL Kania
581:GAF Nomad
499:T63-A-720
493:T63-A-700
353:250-B17Fg
241:does not
135:Variants
65:Turboprop
2459:APW T800
2277:variants
1741:Aircraft
1616:variants
1366:variants
1112:42343144
1028:cite web
1018:14 March
964:See also
747:PZL SW-4
656:Bell 430
651:Bell 230
645:Bell 222
640:Bell 407
635:Bell 206
576:Fuji T-7
571:Fuji T-5
490:T63-A-5A
464:250-C47M
461:250-C47E
458:250-C47B
455:250-C40B
449:250-C30U
446:250-C30S
437:250-C30R
434:250-C30P
431:250-C30M
425:250-C30G
419:250-C28C
416:250-C28B
410:250-C22B
407:250-C20W
404:250-C20S
392:250-C20R
386:250-C20J
383:250-C20F
380:250-C20B
371:250-C18A
362:250-C10D
350:250-B17D
347:250-B17C
344:250-B17B
338:250-B15G
335:250-B15C
332:250-B15A
323:Variants
270:May 2022
103:Bell 206
2275: (
1764:engines
1762:Allison
1622:AE 2100
1614: (
1494:AE 3007
1403:Propfan
1364: (
1342:AE 2100
1337:250/T63
1304:AR.168R
1299:AE 3007
1229:VG-1410
880:Turbine
839:Length:
487:T63-A-5
481:250-KS4
452:250-C34
422:250-C30
413:250-C28
377:250-C20
365:250-C18
341:250-B17
329:250-B15
262:removed
247:sources
200:Bell 47
1695:RB3011
1690:RB2011
1634:MTR390
1411:578-DX
1239:V-3420
1234:V-1710
1110:
1083:1 June
467:250-E3
222:Design
2759:XA103
2754:XA102
2749:XA101
2744:XA100
2614:YF120
2091:YJ101
1748:ACCEL
1731:WR-21
1685:RB529
1668:TP400
1645:RR500
1640:RR300
1589:V2500
1533:RJ500
1528:RB401
1523:RB282
1518:RB183
1506:EJ200
1500:BR700
1012:(PDF)
1005:(PDF)
929:6.2:1
831:Type:
57:Type
2726:F415
2721:F414
2716:F412
2711:F408
2706:F405
2701:F404
2696:F402
2691:F401
2686:F400
2679:F138
2674:F137
2669:F136
2664:F135
2659:F130
2654:F129
2649:F128
2644:F127
2639:F126
2634:F125
2629:F124
2624:F122
2619:F121
2609:F119
2604:F118
2599:F117
2594:F113
2589:F112
2584:F110
2579:F109
2574:F108
2569:F107
2564:F106
2559:F105
2554:F104
2549:F103
2544:F102
2539:F101
2534:F100
2527:TF41
2522:TF39
2517:TF37
2512:TF35
2507:TF34
2502:TF33
2497:TF32
2492:TF31
2487:TF30
2469:T901
2464:T900
2449:T708
2444:T706
2439:T703
2434:T702
2429:T701
2424:T700
2417:T408
2412:T407
2407:T406
2402:T405
2397:T400
2390:T101
2385:T100
2125:J700
2118:J403
2113:J402
2108:J401
2103:J400
2096:J102
2086:J100
2066:YJ93
1936:XJ49
1896:XJ41
1881:XJ38
1777:and
1721:MT30
1662:T800
1656:T406
1628:M250
1512:F136
1392:T800
1387:T701
1382:T406
1315:TF41
1310:TF32
1281:J102
1137:2023
1108:OCLC
1085:2018
1060:2016
1034:link
1020:2016
899:JP-5
895:JP-1
891:JP-4
245:any
243:cite
172:T703
170:and
158:The
2378:T80
2373:T78
2368:T76
2363:T74
2358:T73
2353:T72
2348:T71
2343:T70
2338:T69
2333:T68
2328:T67
2323:T66
2318:T65
2313:T64
2308:T63
2303:T62
2298:T61
2293:T60
2288:T58
2283:T57
2273:T56
2268:T55
2263:T54
2258:T53
2253:T52
2248:T51
2243:T50
2238:T49
2233:T48
2228:T47
2223:T46
2218:T45
2213:T44
2208:T43
2203:T42
2198:T41
2193:T40
2188:T39
2183:T38
2178:T37
2173:T36
2168:T35
2163:T34
2158:T33
2153:T31
2148:T30
2081:J99
2076:J97
2071:J95
2061:J91
2056:J89
2051:J87
2046:J85
2041:J83
2036:J81
2031:J79
2026:J75
2021:J73
2016:J71
2011:J69
2006:J67
2001:J65
1996:J63
1991:J61
1986:J60
1981:J59
1976:J58
1971:J57
1966:J56
1961:J55
1956:J54
1951:J53
1946:J52
1941:J51
1931:J48
1926:J47
1921:J46
1916:J45
1911:J44
1906:J43
1901:J42
1891:J40
1886:J39
1876:J37
1871:J36
1866:J35
1861:J34
1856:J33
1851:J32
1846:J31
1841:J30
1726:MT7
1650:T56
1612:501
1544:Tay
1377:T78
1372:T61
1362:T56
1357:T54
1352:T40
1347:T38
1276:J71
1271:J35
1266:J33
897:or
803:in
256:by
209:LOH
168:T63
50:MTU
2776::
1618:)†
1422:†
1128:.
1102:.
1076:.
1030:}}
1026:{{
647:SP
2279:)
2137:/
1813:e
1806:t
1799:v
1733:‡
1670:‡
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1139:.
1114:.
1087:.
1062:.
1036:)
1022:.
957::
948::
927::
901:)
882::
873::
807:.
688:F
283:)
277:(
272:)
268:(
264:.
250:.
63:/
20:)
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