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Wright R-760 Whirlwind

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limit. The even more powerful R-760E-2 of 1935 could reach 350 hp (261 kW) for takeoff due to increased supercharging and an even higher RPM limit. On the other hand, the R-760E-T, designed for trainer aircraft, had the R-760E-1's high-compression pistons, but the supercharger was removed,
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Over time, Wright refined the R-760, using suffix letters to indicate successive versions. The original R-760 (or J-6-7) was rated for 225 hp (168 kW), while the R-760E of 1931 could do 250 hp (186 kW) thanks to an improved
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design. Wright later added another suffix to show different power levels. The R-760E-1, introduced the same year as the R-760E, had a takeoff power rating of 300 hp (224 kW) thanks to
1190: 231:. The last of these was produced in large numbers, with most of the engines built under license by the Naval Aircraft Factory. Trainers usually had the unsupercharged R-760E-T engine. 2111: 2480: 1778: 1338: 2379: 1065:. This personal collection of museum aircraft engine photos includes a photo of the museum's R-760E-2 under the section for the Evergreen Aviation Museum. 1791: 307:: 320 hp (239 kW) at 2,200 RPM, 350 hp (261 kW) at 2,400 RPM for takeoff. Increased supercharging, slightly higher compression ratio. 2532: 1943: 1862: 1275: 1257: 1239: 1221: 1203: 269:
Production of the R-760 continued until 1945, with about 1400 examples being built by Wright, and more under licence by foreign manufacturers such as
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The R-760 was a direct replacement for the R-790, with similar displacement and power. The U.S. Navy used it as the powerplant for several biplane
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series. The J-6 family included varieties with five, seven, and nine cylinders. The seven-cylinder version was originally known as the
2256: 1331: 2301: 1764: 2527: 1147: 1111: 996:. Transcribed from Wright Aeronautical documents by Robert J. Neal T; available from the Aircraft Engine Historical Society's 2506: 2321: 972: 2336: 2226: 1324: 1048: 430: 2296: 2286: 1787: 1172: 1136: 1000: 2291: 301:: 285 hp (213 kW) at 2,100 RPM, 300 hp (224 kW) at 2,250 RPM for takeoff. Higher compression ratio. 1101: 1088: 378: 179:
was expanded to 5.0 in (12.7 cm) from the R-790's bore of 4.5 in (11.4 cm). While the R-790 was
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Like all the members of the J-6 Whirlwind family, the R-760 had larger cylinders than the R-790. The piston
2326: 1695: 1627: 1595: 1351: 1026: 531: 17: 1363: 362: 2316: 1834: 1829: 1622: 1590: 775: 408: 313:: 235 hp (175 kW) at 2,000 RPM. Naturally aspirated version of R-760E-1 for trainer aircraft. 180: 2496: 2311: 1824: 1814: 2331: 2171: 1895: 1632: 1600: 792: 413: 259: 2266: 2251: 2236: 1612: 1607: 1580: 1575: 1557: 1552: 1505: 1500: 1492: 2216: 2201: 2151: 1547: 1542: 1532: 1525: 1515: 1510: 1311: 1300: 342: 225: 200: 77: 2404: 2306: 2281: 2276: 1658: 1617: 1585: 1567: 606: 263: 8: 1857: 1347: 488: 434: 337: 141: 133: 429:
Wright R-760 engines on display are uncommon, but there is an R-760E-2 exhibited at the
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Female mechanic working on the R-760 engine of a U.S. Navy N3N trainer in October 1942
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of 756 in³ (12.4 L) and power ratings of 225-350 hp (168-261 kW).
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320 hp (239 kW) at 2,200 RPM at sea level; 350 hp (261 kW) at 2,400 RPM for takeoff
451: 383: 295:: 250 hp (186 kW) at 2,000 RPM. Higher power from improved cylinder head. 235: 388: 36: 2359: 2093: 1877: 1354: 1307: 1194: 1004: 981: 479: 398: 352: 217: 172: 129: 266:. These aircraft generally used the various supercharged versions of the R-760. 152:
Wright introduced the J-6 Whirlwind family in 1928 to replace the nine-cylinder
2419: 2409: 2399: 2261: 2246: 2181: 2088: 2073: 2068: 2058: 2048: 2043: 2038: 2033: 2023: 2018: 2013: 2008: 1998: 1983: 1978: 1968: 1963: 1890: 1809: 1143: 1107: 393: 247: 137: 2521: 2166: 2146: 2136: 2103: 1427: 588: 560: 470: 418: 192: 176: 126: 53: 1054: 2460: 2442: 2437: 2374: 2364: 2211: 2206: 2191: 1948: 1910: 1740: 1717: 1648: 1470: 1465: 1445: 1435: 780: 763: 758: 753: 542: 372: 251: 184: 153: 1930: 1920: 997: 347: 327:: 235 hp (175 kW) at 2,000 RPM. U.S. Navy versions of R-760E-T. 2186: 2156: 2141: 2131: 1722: 1709: 1690: 551: 525: 509: 239: 228: 90: 1705: 2470: 2452: 2429: 2351: 1849: 1799: 1672: 548: 454:
data sheet for the R-760E-2; dimensions from Curtiss-Wright (1983).
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of 5.5 in (14.0 cm) was unchanged, but the cylinder
168:; Wright later adopted this and dropped the J-6 nomenclature. 183:, the R-760, like the other J-6 engines, had a gear-driven 1171:. Available from the Aircraft Engine Historical Society's 1135:. Available from the Aircraft Engine Historical Society's 448: 1346: 466:
7-cylinder supercharged air-cooled radial piston engine
1083:. Cambridge, England. Patrick Stephens Limited, 1989. 1187: 164:
for short. The U.S. government designated it as the
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Waco CUC, DQC-6, EQC-6, DGC-7 & 8, EGC-7 & 8
2519: 974:Summary of Wright Engine Shipments: 1920 to 1963 238:also used the R-760, including models built by 1142: 1106: 1772: 1332: 1119:, pp. 11, 13, 14, 16, 17, archived from 616:Specifications for different R-760 variants 440: 204:thus giving just 235 hp (175 kW). 1779: 1765: 1339: 1325: 1186:data sheets, all available from the FAA's 1149:Historical Engine Summary (Beginning 1930) 944: 942: 457: 125:was a series of seven-cylinder air-cooled 2533:Aircraft air-cooled radial piston engines 916: 914: 890: 888: 864: 862: 824: 822: 289:: 225 hp (168 kW) at 2,000 RPM. 147: 1094:Jane's Fighting Aircraft of World War II 958: 956: 954: 363:Curtiss-Wright CW-A-14D Sportsman Deluxe 1028:AEHS List: Engines in Museums Worldwide 939: 932: 930: 928: 926: 878: 876: 874: 14: 2520: 1299:Engine Data Sheets: US Aero Engines — 962:FAA Type Certificate Data Sheet TC 126 936:FAA Type Certificate Data Sheet TC 155 911: 904: 902: 900: 885: 882:FAA Type Certificate Data Sheet ATC 26 859: 852: 850: 848: 846: 844: 842: 840: 838: 836: 834: 819: 715:235 hp (175 kW) at 2,000 RPM 695:350 hp (261 kW) at 2,400 RPM 692:320 hp (239 kW) at 2,200 RPM 672:300 hp (224 kW) at 2,250 RPM 669:285 hp (213 kW) at 2,100 RPM 647:250 hp (186 kW) at 2,000 RPM 207: 1760: 1320: 1096:. London. Studio Editions Ltd, 1989. 951: 908:FAA Type Certificate Data Sheet TC 94 431:Evergreen Aviation & Space Museum 424: 1016:FAA Type Certificate Data Sheet 5E-6 923: 871: 409:Waco CJC, CJC-S, DJC, DJC-S, and DJS 2502:US military gas turbine aeroengines 897: 831: 24: 1259:Type Certificate Data Sheet TC 126 1241:Type Certificate Data Sheet TC 155 1205:Type Certificate Data Sheet ATC 26 1081:World Encyclopedia of Aero Engines 25: 2549: 1293: 1223:Type Certificate Data Sheet TC 94 1113:Wright Engines - Past and Present 379:Naval Aircraft Factory N3N Canary 1277:Type Certificate Data Sheet 5E-6 35: 1188:Regulatory and Guidance Library 1181:Federal Aviation Administration 1072: 1041: 1019: 1010: 965: 389:Stearman C3R Business Speedster 331: 97:Various civil utility aircraft 74:Wright Aeronautical Corporation 810: 575: 13: 1: 2528:1920s aircraft piston engines 798: 518: 2507:Piston engine configurations 948:Curtiss-Wright (1940), p. 16 920:Curtiss-Wright (1940), p. 17 894:Curtiss-Wright (1940), p. 14 868:Curtiss-Wright (1940), p. 13 828:Curtiss-Wright (1940), p. 11 7: 1155:, p. 1, archived from 856:Curtiss-Wright (1983), p. 1 735: 280: 271:Fábrica Nacional de Motores 187:to boost its power output. 10: 2554: 776:Armstrong Siddeley Cheetah 729:540 lb (245 kg) 707:570 lb (259 kg) 684:565 lb (256 kg) 661:530 lb (240 kg) 2489: 2469: 2451: 2428: 2350: 2102: 1929: 1876: 1848: 1798: 1731: 1704: 1671: 1641: 1566: 1491: 1484: 1425: 1361: 593:0.42 hp/cu-in (19.3 kW/L) 441:Specifications (R-760E-2) 93:U.S. Navy primary trainer 43: 34: 29: 803: 793:List of aircraft engines 95:Other U.S. Navy trainers 2538:Wright aircraft engines 2473:W-configuration inline) 1802:H-configuration inline) 1790:piston aircraft engine 633:Supercharger gear ratio 611:0.56 hp/lb (0.92 kW/kg) 458:General characteristics 358:Curtiss N2C-2 Fledgling 2453:VG (inverted-V inline) 1878:L (single-bank inline) 1850:IV (inverted-V inline) 1788:United States military 343:Beechcraft Staggerwing 226:Naval Aircraft Factory 199:pistons and a greater 148:Design and development 140:. These engines had a 123:Wright R-760 Whirlwind 78:Naval Aircraft Factory 52:Air-cooled 7-cylinder 2430:V (inverted-V inline) 607:Power-to-weight ratio 222:Curtiss N2C Fledgling 2352:V (upright-V inline) 1126:on February 15, 2010 816:Gunston 1989, p.181. 547:gear-driven, 9.17:1 54:radial piston engine 1162:on October 31, 2010 748:Related development 617: 499:42.44 in (107.8 cm) 435:McMinnville, Oregon 338:Abrams P-1 Explorer 234:A variety of civil 208:Operational history 181:naturally aspirated 158:J-6 Whirlwind Seven 134:Wright Aeronautical 1792:designation system 1306:2009-06-28 at the 1193:2016-11-12 at the 1003:2010-02-04 at the 770:Comparable engines 764:Wright J-6-9/R-975 759:Wright J-6-5/R-540 615: 505:45.0 in (114.3 cm) 425:Engines on display 368:Fairchild Model 45 348:Cessna DC-6B Scout 197:higher-compression 86:Major applications 2515: 2514: 1754: 1753: 1667: 1666: 1312:second R-760 page 1273:R-760-2, -4, -8: 733: 732: 630:Compression ratio 624:Power, continuous 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1030: 1029: 1022: 1013: 1006: 1002: 999: 983: 976: 975: 968: 959: 957: 955: 945: 943: 933: 931: 929: 927: 917: 915: 905: 903: 901: 891: 889: 879: 877: 875: 865: 863: 853: 851: 849: 847: 845: 843: 841: 839: 837: 835: 825: 823: 813: 809: 794: 791: 790: 789: 788: 787:Related lists 782: 779: 777: 774: 773: 772: 771: 765: 762: 760: 757: 755: 752: 751: 750: 749: 743: 740: 739: 728: 725: 722: 719: 717: 714: 711: 710: 706: 703: 700: 697: 694: 691: 688: 687: 683: 680: 677: 674: 671: 668: 665: 664: 660: 657: 654: 651: 649: 646: 643: 642: 638: 636:Octane rating 635: 632: 629: 626: 623: 620: 619: 610: 608: 604: 601: 599: 595: 592: 590: 586: 583: 582:Power output: 580: 579: 570: 568: 564: 562: 558: 555: 553: 550: 546: 544: 540: 537: 533: 529: 527: 523: 522: 513: 511: 507: 504: 501: 498: 495: 492: 490: 486: 483: 481: 477: 474: 472: 468: 465: 462: 461: 455: 453: 450: 447: 438: 436: 432: 420: 417: 415: 412: 410: 407: 405: 402: 400: 397: 395: 392: 390: 387: 385: 382: 380: 377: 374: 371: 369: 366: 364: 361: 359: 356: 354: 351: 349: 346: 344: 341: 339: 336: 335: 326: 322: 318: 315: 312: 309: 306: 303: 300: 297: 294: 291: 288: 287:J-6-7 (R-760) 285: 284: 278: 276: 272: 267: 265: 261: 257: 253: 249: 245: 241: 237: 232: 230: 227: 223: 219: 215: 205: 202: 198: 194: 193:cylinder head 188: 186: 182: 178: 174: 169: 167: 163: 159: 155: 145: 143: 139: 135: 132:built by the 131: 128: 124: 114: 109: 108: 104: 101: 100: 92: 89: 84: 83: 79: 75: 72: 70:Manufacturer 69: 68: 64: 59: 58: 55: 51: 48: 47: 42: 38: 33: 28: 19: 2493: 2196: 1591:Twin Cyclone 1537: 1520: 1283:December 12, 1281:, retrieved 1276: 1265:December 12, 1263:, retrieved 1258: 1247:December 12, 1245:, retrieved 1240: 1229:December 12, 1227:, retrieved 1222: 1211:December 12, 1209:, retrieved 1204: 1178: 1166:December 12, 1164:, retrieved 1157:the original 1148: 1130:December 12, 1128:, retrieved 1121:the original 1112: 1093: 1080: 1073:Bibliography 1059:, retrieved 1055:the original 1049: 1043: 1032:, retrieved 1027: 1021: 1012: 991:December 10, 989:, retrieved 982:the original 973: 967: 812: 786: 785: 781:Jacobs R-755 769: 768: 747: 746: 605: 596: 587: 581: 571:Direct drive 565: 556: 543:Supercharger 541: 524: 508: 502: 496: 489:Displacement 487: 478: 469: 463: 445: 444: 428: 373:Howard DGA-8 332:Applications 324: 320: 316: 310: 304: 298: 292: 286: 268: 252:Howard DGA-8 233: 211: 189: 185:supercharger 170: 165: 161: 157: 151: 142:displacement 136:division of 122: 120: 115:around 1400 111:Number built 18:Wright J-6-7 1931:O (opposed) 1710:turboshafts 1397:T-4 Tornado 1392:T-3 Tornado 1387:T-2 Tornado 1382:T-1 Tornado 1377:Gipsy L-320 639:Dry weight 576:Performance 375:and DGA-15W 2522:Categories 2443:V-1650 (L) 2405:V-1650 (P) 2127:R-370 (LB) 2104:R (radial) 1706:Turboprops 1601:Cyclone 22 1255:R-760E-T: 1237:R-760E-2: 1219:R-760E-1: 1061:2009-12-13 1034:2009-12-13 799:References 557:Fuel type: 552:gear ratio 526:Valvetrain 519:Components 510:Dry weight 240:Beechcraft 229:N3N Canary 224:, and the 105:1929-1945 91:N3N Canary 2494:See also: 2157:R-540 (K) 2152:R-540 (W) 2132:R-370 (K) 2074:O-540 (L) 2069:O-540 (F) 2034:O-360 (L) 2029:O-360 (C) 1999:O-200 (F) 1994:O-200 (C) 1673:Turbojets 1581:Cyclone 9 1576:Cyclone 7 1426:Lawrance 712:R-760E-T 689:R-760E-2 666:R-760E-1 538:-actuated 503:Diameter: 446:Data from 102:Produced 1649:L-3 Gale 1352:Lawrance 1304:Archived 1201:R-760E: 1191:Archived 1146:(1983), 1110:(1940), 1001:Archived 736:See also 549:impeller 419:Waco CRG 311:R-760E-T 305:R-760E-2 299:R-760E-1 281:Variants 256:Stearman 2461:VG-1410 2342:XR-7755 1868:IV-2220 1863:IV-2040 1858:IV-1430 1835:XH-3730 1830:XH-3130 1825:XH-2600 1820:XH-2470 1815:XH-2240 1733:Ramjets 1586:Cyclone 1428:radials 1412:IV-1560 1407:IV-1460 1362:Wright 644:R-760E 536:pushrod 497:Length: 317:R-760-2 260:Stinson 2497:X-1800 2481:W-2779 2420:V-3420 2415:V-1950 2410:V-1710 2400:V-1570 2395:V-1560 2390:V-1510 2385:V-1460 2380:V-1440 2375:V-1400 2370:V-1237 2365:V-1150 2337:R-4360 2332:R-4090 2327:R-3350 2322:R-2800 2317:R-2600 2312:R-2180 2307:R-2160 2302:R-2060 2297:R-2000 2292:R-1860 2287:R-1830 2282:R-1820 2277:R-1750 2272:R-1690 2267:R-1670 2262:R-1640 2257:R-1535 2252:R-1510 2247:R-1454 2242:R-1340 2237:R-1300 2232:R-1044 2222:DR-980 2094:O-1230 1840:H-4070 1810:H-1640 1654:R-1200 1642:Others 1633:R-4090 1628:R-3350 1623:R-2600 1618:R-1820 1613:R-1750 1608:R-1300 1558:R-1670 1553:R-1510 1417:V-1950 1348:Wright 1100:  1087:  701:9.17:1 678:7.05:1 655:7.05:1 621:Engine 561:octane 532:valves 480:Stroke 293:R-760E 275:Brazil 262:, and 244:Cessna 220:, the 173:stroke 127:radial 2438:V-770 2360:V-720 2227:R-985 2217:R-975 2212:R-915 2207:R-830 2202:R-790 2197:R-760 2192:R-755 2187:R-720 2182:R-680 2177:R-670 2172:R-600 2167:R-550 2162:R-545 2147:R-500 2142:R-440 2137:R-420 2122:R-270 2117:R-265 2112:R-250 2089:O-805 2084:O-580 2079:O-550 2064:O-520 2059:O-480 2054:O-470 2049:O-435 2044:O-425 2039:O-405 2024:O-335 2019:O-300 2014:O-290 2009:O-235 2004:O-205 1989:O-190 1984:O-180 1979:O-175 1974:O-170 1969:O-150 1964:O-145 1959:O-100 1921:L-825 1916:L-510 1911:L-440 1906:L-410 1901:L-390 1896:L-375 1891:L-365 1886:L-330 1548:R-975 1543:R-790 1538:R-760 1533:R-540 1526:J-6-9 1521:J-6-7 1516:J-6-5 1402:V-720 1160:(PDF) 1153:(PDF) 1124:(PDF) 1117:(PDF) 985:(PDF) 978:(PDF) 804:Notes 720:6.1:1 698:6.3:1 675:6.1:1 652:5.1:1 602:6.3:1 464:Type: 166:R-760 162:J-6-7 160:, or 154:R-790 49:Type 1954:O-90 1949:O-45 1944:O-40 1939:O-15 1746:RJ55 1741:RJ47 1350:and 1285:2009 1267:2009 1249:2009 1231:2009 1213:2009 1168:2009 1132:2009 1098:ISBN 1085:ISBN 993:2009 723:none 471:Bore 264:Waco 177:bore 121:The 1723:T49 1718:T35 1696:J67 1691:J65 1686:J61 1681:J59 1511:J-5 1506:J-4 1501:J-3 1476:L-5 1471:L-4 1466:L-3 1461:L-2 1456:L-1 1451:J-2 1446:J-1 1441:C-2 1436:A-3 559:80 449:FAA 433:in 273:in 201:RPM 2524:: 1310:, 1197:: 953:^ 941:^ 925:^ 913:^ 899:^ 887:^ 873:^ 861:^ 833:^ 821:^ 726:73 704:80 681:73 658:73 530:2 437:. 325:-8 323:, 321:-4 319:, 277:. 258:, 254:, 250:, 246:, 242:, 1780:e 1773:t 1766:v 1708:/ 1372:E 1340:e 1333:t 1326:v 1288:. 1270:. 1252:. 1234:. 1216:. 1175:. 1139:. 1038:. 1007:. 609:: 600:: 591:: 569:: 545:: 528:: 512:: 491:: 482:: 473:: 20:)

Index

Wright J-6-7

radial piston engine
Wright Aeronautical Corporation
Naval Aircraft Factory
N3N Canary
radial
aircraft engines
Wright Aeronautical
Curtiss-Wright
displacement
R-790
stroke
bore
naturally aspirated
supercharger
cylinder head
higher-compression
RPM
primary trainers
Consolidated NY
Curtiss N2C Fledgling
Naval Aircraft Factory
N3N Canary
utility aircraft
Beechcraft
Cessna
Curtiss-Wright
Howard DGA-8
Stearman

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