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335:, but larger. In both series a nine-cylinder single-row engine was later supplemented by an enlarged fourteen cylinder engine, with two rows of the same cylinders, but reduced in number to seven per row to aid cooling to the rear row (it was never made into a larger, 18 cylinder radial like the related Wasp was).
342:, were of near-identical displacement (1860 vs. 1830), although the fourteen-cylinder Twin Wasp was more complex and costly than the nine-cylinder, single-row Hornet B. The Twin Wasp was by far the more powerful engine though, even in its early versions it produced 800
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rating. A further advantage was the reduced diameter of the Wasp: 48 inches compared to 57. This reduced drag, and the relatively large diameter of the Hornet would also have been a serious drawback for visibility if used in a small single-engined aircraft.
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Although a technically competent design, the enlarged Hornet B engine was not a commercial success. Customers preferred to buy the R-1830 Twin Wasp instead, which in time became the most numerous aircraft engine ever produced.
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is shorter, which reduces the vibration of reciprocation, and therefore crew and mechanical fatigue. The reduced stroke also allows for a higher maximum RPM limit, since the mean
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is reduced, the distance the piston has to cover per each engine revolution being shorter. Having a shorter stroke but a higher rpm limit for the same displacement reduces the
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and was basically similar, but enlarged in capacity from 1,690 to 1,860 cubic inches (30.5 L). Cylinder bore was increased by 1/8" and the
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The cylinder and valve design was typical for Pratt & Whitney, a simple design with two large valves driven by
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328:. The enlarged engine was designed by George Willgoos and was first available in 1929.
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Two of these engines, the enlarged single-row Hornet B described here and the
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The
Engines of Pratt & Whitney: A Technical History
115:. Unsourced material may be challenged and removed.
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may be too technical for most readers to understand
709:American Institute of Aeronautics and Astronautics
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331:The Hornet series of engines was similar to the
728:World Encyclopedia of Aero Engines, 5th Edition
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458:and Aircraft Piston Engines by Herschel Smith
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2309:Aircraft air-cooled radial piston engines
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175:Learn how and when to remove this message
73:Learn how and when to remove this message
57:, without removing the technical details.
612:Pratt & Whitney R-2180-A Twin Hornet
358:levels, but allows for a higher maximum
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316:, with a single row of nine cylinders.
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1524:Pratt & Whitney Canada aeroengines
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746:"Pratt & Whitney Hornet R-1860-B"
450:"Pratt & Whitney Hornet R-1860-B"
124:"Pratt & Whitney R-1860 Hornet B"
55:make it understandable to non-experts
2314:Pratt & Whitney aircraft engines
629:Pratt & Whitney R-1830 Twin Wasp
204:Pratt & Whitney R-1860 Hornet B
113:adding citations to reliable sources
84:
29:
2278:US military gas turbine aeroengines
288:Pratt & Whitney R-1860 Hornet B
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546:-actuated, two valves per cylinder
27:Early 20th century aircraft engine
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606:Pratt & Whitney R-1690 Hornet
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18:Pratt & Whitney R-1860 Hornet
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420:(engine evaluation testbed only)
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100:needs additional citations for
1459:Pratt & Whitney Rocketdyne
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1:
2304:1920s aircraft piston engines
1517:Joint development aeroengines
750:National Air and Space Museum
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557:centrifugal type supercharger
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454:National Air and Space Museum
2283:Piston engine configurations
590:575 hp (429 kW) at 1,950 rpm
7:
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309:by 3/8". Both engines were
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1454:Pratt & Whitney Canada
294:. It was a development of
290:was a relatively uncommon
279:Pratt & Whitney R-1690
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470:Nine-cylinder single-row
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1500:Richard "Dick" Soderberg
996:Free-piston gas turbines
757:Smith, Herschel (1981).
647:List of aircraft engines
2249:W-configuration inline)
1578:H-configuration inline)
1566:piston aircraft engine
759:Aircraft Piston Engines
462:General characteristics
2229:VG (inverted-V inline)
1654:L (single-bank inline)
1626:IV (inverted-V inline)
1564:United States military
761:. New York, New York:
726:Gunston, Bill (2006).
703:Connors, Jack (2010).
397:Consolidated Fleetster
392:Consolidated Commodore
320:Design and development
255:Consolidated Fleetster
2206:V (inverted-V inline)
634:Wright R-1820 Cyclone
2128:V (upright-V inline)
1495:Frederick Rentschler
707:. Reston. Virginia:
518:144.6 cm (56.93 in.)
512:113.7 cm (44.78 in.)
377:Bellanca C-27 Airbus
109:improve this article
1418:Aeroderivative gas
817:Pratt & Whitney
600:Related development
506:1864 cuin (30.54 L)
497:6.75 in. (171.4 mm)
488:6.25 in. (158.8 mm)
296:Pratt & Whitney
235:Pratt & Whitney
1568:designation system
928:Twin Wasp (R-2000)
923:Twin Wasp (R-1830)
618:Comparable engines
250:Major applications
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986:XH-3130 (XH-3730)
718:978-1-60086-711-8
576:Epicyclic gearing
527:376.4 kg (830 lb)
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973:H piston engines
938:Twin Wasp Junior
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963:Yellow Jacket
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737:0-7509-4479-X
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679:Connors, p.79
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641:Related lists
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588:Power output:
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555:Single-speed
554:
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478:radial engine
476:
473:
469:
466:
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451:
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436:
435:Sikorsky S-41
433:
431:
430:Sikorsky S-40
428:
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419:
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413:
412:Keystone LB-8
410:
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407:Keystone B-4A
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300:R-1690 Hornet
297:
293:
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272:
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267:Sikorsky S-41
264:
263:Sikorsky S-40
260:
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231:Manufacturer
230:
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225:United States
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213:Radial engine
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126: –
125:
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120:Find sources:
114:
110:
104:
103:
98:This article
96:
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66:
56:
52:
46:
43:This article
41:
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1520:
1447:Subsidiaries
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860:
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727:
704:
696:Bibliography
684:
675:
666:
640:
639:
617:
616:
599:
598:
587:
569:
561:
551:Supercharger
549:
537:
521:
515:
509:
502:Displacement
500:
491:
482:
472:supercharged
467:
445:
444:
371:Applications
365:
352:piston speed
337:
330:
323:
287:
285:
259:Keystone B-4
171:
165:January 2011
162:
152:
145:
138:
131:
119:
107:Please help
102:verification
99:
69:
60:
44:
1707:O (opposed)
1490:Perry Pratt
1298:Turboshafts
953:Wasp Junior
943:Wasp series
933:Twin Wasp E
918:Twin Hornet
903:Double Wasp
763:McGraw-Hill
688:Smithsonian
582:Performance
424:Martin XT6M
402:Fokker F-32
387:Boeing YB-9
356:peak torque
298:'s earlier
2298:Categories
2219:V-1650 (L)
2181:V-1650 (P)
1903:R-370 (LB)
1880:R (radial)
1468:Key people
1294:Turboprops
958:Wasp Major
908:Hornet (A)
653:References
565:Air-cooled
539:Valvetrain
532:Components
523:Dry weight
475:air-cooled
360:horsepower
311:air-cooled
304:crankshaft
241:First run
135:newspapers
63:March 2024
2270:See also:
1933:R-540 (K)
1928:R-540 (W)
1908:R-370 (K)
1850:O-540 (L)
1845:O-540 (F)
1810:O-360 (L)
1805:O-360 (C)
1775:O-200 (F)
1770:O-200 (C)
1521:See also:
1109:Turbofans
1014:Turbojets
516:Diameter:
446:Data from
1381:Propfans
1364:T800-APW
1219:SuperFan
913:Hornet B
881:R-2180-E
876:R-2180-A
595:See also
326:pushrods
2237:VG-1410
2118:XR-7755
1644:IV-2220
1639:IV-2040
1634:IV-1430
1611:XH-3730
1606:XH-3130
1601:XH-2600
1596:XH-2470
1591:XH-2240
1433:GG4/FT4
1428:GG3/FT3
1208:RTF-180
1178:PW1000G
544:Pushrod
510:Length:
149:scholar
49:Please
2273:X-1800
2257:W-2779
2196:V-3420
2191:V-1950
2186:V-1710
2176:V-1570
2171:V-1560
2166:V-1510
2161:V-1460
2156:V-1440
2151:V-1400
2146:V-1237
2141:V-1150
2113:R-4360
2108:R-4090
2103:R-3350
2098:R-2800
2093:R-2600
2088:R-2180
2083:R-2160
2078:R-2060
2073:R-2000
2068:R-1860
2063:R-1830
2058:R-1820
2053:R-1750
2048:R-1690
2043:R-1670
2038:R-1640
2033:R-1535
2028:R-1510
2023:R-1454
2018:R-1340
2013:R-1300
2008:R-1044
1998:DR-980
1870:O-1230
1616:H-4070
1586:H-1640
1389:578-DX
1312:JFTD12
1214:STF200
1203:PW6000
1198:PW5000
1193:PW4000
1188:PW2000
1183:PW1120
1148:JTF10A
1117:GP7000
896:R-4360
891:R-2800
886:R-2270
871:R-2060
866:R-2000
861:R-1860
856:R-1830
851:R-1690
846:R-1535
841:R-1340
769:
734:
715:
493:Stroke
348:stroke
307:stroke
151:
144:
137:
130:
122:
2214:V-770
2136:V-720
2003:R-985
1993:R-975
1988:R-915
1983:R-830
1978:R-790
1973:R-760
1968:R-755
1963:R-720
1958:R-680
1953:R-670
1948:R-600
1943:R-550
1938:R-545
1923:R-500
1918:R-440
1913:R-420
1898:R-270
1893:R-265
1888:R-250
1865:O-805
1860:O-580
1855:O-550
1840:O-520
1835:O-480
1830:O-470
1825:O-435
1820:O-425
1815:O-405
1800:O-335
1795:O-300
1790:O-290
1785:O-235
1780:O-205
1765:O-190
1760:O-180
1755:O-175
1750:O-170
1745:O-150
1740:O-145
1735:O-100
1697:L-825
1692:L-510
1687:L-440
1682:L-410
1677:L-390
1672:L-375
1667:L-365
1662:L-330
1306:APW34
1284:XA103
1279:XA101
1225:V2500
1173:JTF22
1168:JTF17
1163:JTF16
1158:JTF14
1153:JT10D
1143:JTF10
836:R-985
658:Notes
468:Type:
244:1929
209:Type
156:JSTOR
142:books
1730:O-90
1725:O-45
1720:O-40
1715:O-15
1408:RL10
1370:T900
1354:XT57
1344:XT45
1274:TF33
1269:TF30
1258:F401
1253:F135
1248:F119
1243:F117
1238:F105
1233:F100
1138:JT9D
1133:JT8D
1128:JT4D
1123:JT3D
1057:JT12
1052:JT11
1042:JT8A
1027:JT4A
1022:JT3C
948:Wasp
767:ISBN
732:ISBN
713:ISBN
484:Bore
333:Wasp
286:The
128:news
1438:FT8
1359:T73
1349:T52
1339:T34
1332:PT5
1327:PT4
1322:PT3
1317:PT2
1263:RM8
1099:J91
1094:J75
1089:J60
1084:J58
1079:J57
1074:J52
1069:J48
1064:J42
1047:JT9
1037:JT7
1032:JT6
1004:PT1
344:bhp
111:by
53:to
2300::
1515:†
765:.
711:.
1556:e
1549:t
1542:v
1391:†
1372:†
1366:†
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1296:/
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1227:†
1221:†
1210:†
1119:†
809:e
802:t
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752:.
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721:.
636:9
608:A
573::
553::
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172:(
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163:(
153:·
146:·
139:·
132:·
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70:(
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61:(
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