Knowledge (XXG)

Lockheed XH-51

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179: 252: 29: 234:). These aircraft had the five-seat configuration of the XH-51N with the four-bladed rotor system of the XH-51A. The Model 286 was certificated for civil operation by the FAA on 30 June 1966, but Lockheed never sold any aircraft. Lockheed used the aircraft for several years as executive transports. The aircraft were eventually sold to a collector and later destroyed by fire in 1988. 215:
engine mounted on the left wing to increase performance. The XH-51A Compound first flew without powering up the turbojet on 21 September 1964, while tests were conducted for balance and handling. The aircraft's first flight as a true compound helicopter took place on 10 April 1965. and on 29 November
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turboshaft engine, XH-51A (serial number 61-51262) first flew on 2 November 1962. As flight testing progressed, the original three-bladed, rigid rotor system demonstrated instability at higher speed ranges. Lockheed engineers solved the problem by modifying the aircraft with a four-bladed rotor
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observation helicopters. Lockheed also tested the commercial market waters without success. However, in February 1962, Lockheed's Model 186, a new design based on the CL-475 rigid rotor, was selected as the winner for a joint Army-Navy program to evaluate the rigid rotor for high-speed flight
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helicopter design in 1959. The choice of a rigid rotor meant that the helicopter was more agile than it would have been with a flapping rotor. The performance of the CL-475 encouraged Lockheed to seek further development. Lockheed submitted the CL-475 to the Army as a candidate to replace the
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attack helicopter. However technical problems led first to delays then to a suspension of production. Compounded by inter-service rivalry and political issues the Cheyenne was cancelled completely in 1972 and it was Lockheed's last helicopter.
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To meet the US Army's "Advanced Aerial Fire Support System" program for an attack helicopter, Lockheed designed a rigid rotor compound helicopter with a pusher tail-mounted propeller which was ordered into production as the
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1967 achieved a speed of 263 knots (302.6 mph, 486.9 km/h) in a shallow descent. The highest level flight speed was 223 kn (413 km/h; 257 mph).
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The second XH-51A (serial number 61-51263) was subsequently converted by adding wings with a span of 16.1 ft (4.9 m), and a 2,900 lbf (12.9 kN)
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Lockheed built two demonstrator aircraft, designated the Lockheed Model 286, to market to the public (registration numbers
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modified with a four-bladed rotor and stub wings and an auxiliary 2,900 lbf (12.9 kN) Pratt & Whitney J60-2 engine.
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Two four-seat, three-bladed XH-51As were ordered and built for the program. Powered by the 550 shp (410 kW)
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five place civilian or military light helicopter offered for sale, none were sold.
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The two XH-51A examples (Serial Numbers 61-51262 and 61-51263) are stored at the
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In June 1964, NASA ordered a five-seat, three-bladed variant, the
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XH-51A following its conversion into a compound rotorcraft testbed
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16,000 ft (4,900 m) (hover ceiling), in ground effect
539:. American Helicopter Society, International. Archived from 537:"US and Russian Helicopter Development In the 20th Century" 2992:
Numerical sequence used by USAAC/USAAF/USAF 1941–present;
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Lentine, F. P.; Groth, W. P.; Oglesby, T. H. (June 1968).
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80 US gal (67 imp gal; 300 L)
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five place, three-bladed rotor for NASA test purposes.
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(2000). 400:140 kn (160 mph, 260 km/h) 394:151 kn (174 mph, 280 km/h) 223:(NASA 531) as a helicopter test vehicle. 535:Hirschberg, Michael J.; Daley, David K. 309:Janes's All The World's Aircraft 1969-70 647:Jane's All The World's Aircraft 1969-70 472: 406:230 nmi (260 mi, 420 km) 623: 493: 491: 7: 649:. London: Jane's. pp. 359–360. 373:35 ft 0 in (10.67 m) 335:8 ft 2.5 in (2.50 m) 329:40 ft 9 in (12.42 m) 144:to explore rigid rotor technology. 3773:United States military helicopters 618:United States Army Aviation Museum 292:United States Army Aviation Museum 14: 2981:designations, Army/Air Force and 379:962 sq ft (89.4 m) 194:Pratt & Whitney Canada PT6B-9 498:Robb, Raymond L. (Summer 2006). 27: 3738:1960s United States helicopters 418:2,000 ft/min (10 m/s) 690:XH-51A newsreel at archive.org 361:Pratt & Whitney Canada PT6 263:four place, three-bladed rotor 152:Lockheed began developing its 1: 347:4,100 lb (1,860 kg) 341:2,790 lb (1,266 kg) 3743:Aircraft first flown in 1962 2996:1948–1956 and 1962–present; 645:Taylor, J.W.R., ed. (1969). 367:, 500 shp (370 kW) 197:system. In 1963, the Army's 182:The first XH-51A landing on 564:Badrocke and Gunston (1998) 255:The three XH-51s in flight. 3789: 3768:Single-turbine helicopters 578:. Lockheed. Archived from 3753:Jet-propelled helicopters 3718: 2990: 2937: 630:: CS1 maint: unfit URL ( 601:Landis & Jenkins 2000 210:Pratt & Whitney J60-2 26: 614:"Rotary Wing Collection" 3763:Rigid rotor helicopters 3006:Army/Air Force sequence 733:aircraft and spacecraft 314:General characteristics 302:Specifications (XH-51A) 240:Lockheed AH-56 Cheyenne 256: 189: 148:Design and development 921:C-130 Hercules family 788:8-D, E & G Altair 692:(begins at 3:47 mark) 603:, pp. 29–31, 34. 254: 181: 3748:Compound helicopters 3319:Tri-Service sequence 3106:Prefix H-, 1948–1962 3015:Prefix R-, 1941–1948 1130:Shooting Star family 994:L-188 Electra family 855:Constellation family 371:Main rotor diameter: 61:Lockheed Corporation 3329:1962 redesignations 668:. Specialty Press. 456:List of helicopters 428:Related development 345:Max takeoff weight: 203:compound helicopter 174:Operational history 39:General information 3581:Alternate sequence 1161:Starfighter family 286:Surviving aircraft 257: 190: 167:Hiller OH-23 Raven 142:United States Navy 138:United States Army 79:United States Army 3758:Lockheed aircraft 3725: 3724: 3714: 3713: 3313: 3312: 2944: 2943: 2933: 2932: 1488: 1487: 1283: 1282: 1092: 1091: 819:12 Electra Junior 156:concept with the 134:Lockheed Aircraft 118: 117: 3780: 3553: 3392:New designations 3326: 3306: 3301: 3271: 3261: 3012: 2971: 2964: 2957: 2948: 2906: 2901: 2891: 2871: 2861: 2836: 2831: 2816: 2806: 2796: 2781: 2776: 2755: 1963: 1958: 1948: 1908: 1893: 1853: 1833: 1791: 1295:Blackbird family 1292: 1104:Lightning family 1101: 892:L-1649 Starliner 824:14 Super Electra 774: 743: 720: 713: 706: 697: 679: 651: 650: 642: 636: 635: 629: 621: 610: 604: 598: 592: 591: 589: 587: 571: 565: 562: 553: 552: 550: 548: 532: 526: 525: 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266:XH-51A Compound 249: 176: 150: 114:2 November 1962 85: 34: 17: 12: 11: 5: 3786: 3784: 3776: 3775: 3770: 3765: 3760: 3755: 3750: 3745: 3740: 3730: 3729: 3723: 3722: 3719: 3716: 3715: 3712: 3711: 3709: 3708: 3703: 3702: 3701: 3691: 3685: 3683: 3682:Non-sequential 3679: 3678: 3676: 3675: 3674: 3673: 3668: 3663: 3655: 3650: 3645: 3644: 3643: 3638: 3630: 3629: 3628: 3618: 3617: 3616: 3603: 3584: 3582: 3578: 3577: 3575: 3574: 3569: 3564: 3559: 3554: 3549: 3544: 3539: 3534: 3529: 3524: 3519: 3514: 3509: 3508: 3507: 3502: 3497: 3492: 3484: 3479: 3474: 3469: 3464: 3459: 3454: 3453: 3452: 3447: 3431: 3426: 3421: 3416: 3411: 3406: 3401: 3395: 3393: 3389: 3388: 3386: 3385: 3380: 3375: 3370: 3365: 3360: 3355: 3350: 3349: 3348: 3343: 3332: 3330: 3323: 3322:(1962–present) 3315: 3314: 3311: 3310: 3308: 3307: 3302: 3297: 3292: 3287: 3282: 3277: 3272: 3267: 3262: 3257: 3252: 3247: 3242: 3237: 3232: 3227: 3222: 3217: 3212: 3207: 3202: 3197: 3192: 3187: 3182: 3177: 3172: 3167: 3162: 3157: 3152: 3151: 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1557: 1553: 1547: 1546:VH-92 Patriot 1544: 1542: 1541:VH-71 Kestrel 1539: 1537: 1534: 1532: 1529: 1527: 1524: 1523: 1521: 1517: 1511: 1508: 1506: 1503: 1501: 1498: 1497: 1495: 1491: 1481: 1478: 1476: 1473: 1471: 1468: 1466: 1463: 1461: 1458: 1456: 1453: 1451: 1448: 1446: 1443: 1441: 1438: 1436: 1433: 1431: 1428: 1426: 1423: 1422: 1420: 1416: 1410: 1407: 1405: 1402: 1400: 1397: 1395: 1392: 1390: 1387: 1386: 1384: 1380: 1374: 1371: 1369: 1368:CP-140 Aurora 1366: 1364: 1361: 1359: 1356: 1354: 1351: 1349: 1346: 1344: 1341: 1339: 1336: 1335: 1333: 1329: 1323: 1320: 1318: 1315: 1313: 1310: 1308: 1305: 1303: 1300: 1299: 1297: 1293: 1290: 1286: 1276: 1273: 1271: 1268: 1266: 1263: 1261: 1258: 1256: 1253: 1251: 1248: 1246: 1243: 1241: 1238: 1236: 1233: 1232: 1230: 1226: 1220: 1217: 1215: 1212: 1210: 1207: 1205: 1202: 1201: 1199: 1197:Raptor family 1195: 1189: 1186: 1184: 1181: 1179: 1176: 1174: 1171: 1169: 1166: 1165: 1163: 1159: 1153: 1150: 1148: 1145: 1143: 1140: 1138: 1135: 1134: 1132: 1128: 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570: 567: 561: 559: 555: 543:on 2001-06-05 542: 538: 531: 528: 516:on 2006-09-27 512: 508: 501: 494: 492: 488: 484: 483: 476: 473: 466: 461: 457: 454: 452: 449: 448: 447: 446: 445:Related lists 440: 437: 435: 432: 431: 430: 429: 422: 417: 414: 411: 408: 405: 402: 399: 398:Cruise speed: 396: 393: 390: 389: 388: 386: 378: 375: 372: 369: 366: 362: 358: 355: 352: 349: 346: 343: 340: 339:Empty weight: 337: 334: 331: 328: 325: 322: 319: 318: 317: 315: 310: 308: 301: 299: 297: 293: 285: 280: 277: 274: 271: 268: 265: 262: 259: 258: 253: 246: 244: 241: 235: 233: 229: 224: 222: 217: 214: 211: 206: 204: 200: 195: 188: 187: 180: 173: 171: 168: 164: 159: 155: 147: 145: 143: 139: 135: 131: 127: 123: 113: 109: 105: 101: 96: 92: 88: 84: 80: 77: 75:Primary users 73: 69: 65: 62: 59: 57: 53: 50: 47:Experimental 46: 42: 37: 30: 25: 20: 3720:Not assigned 3423: 3000:1962–present 2939:Not assigned 2471: 2286: 2191: 2061: 1587:Star Clipper 1555:Experimental 1530: 1382:Other crewed 1348:PV-2 Harpoon 1343:PV-1 Ventura 665: 658:Bibliography 646: 640: 608: 596: 584:. Retrieved 580:the original 569: 545:. Retrieved 541:the original 530: 518:. Retrieved 511:the original 506: 480: 475: 444: 443: 427: 426: 415: 409: 403: 397: 391: 384: 382: 376: 370: 356: 350: 344: 338: 332: 326: 320: 313: 311: 306: 305: 296:Fort Novosel 289: 236: 231: 227: 225: 220: 218: 207: 191: 185: 170:capability. 151: 132:designed by 125: 121: 119: 111:First flight 103:Manufactured 90:Number built 56:Manufacturer 3699:CH-92/VH-92 3450:HH-53/MH-53 3008:(1941–1962) 2983:Tri-Service 1582:Senior Prom 1519:Helicopters 1440:Desert Hawk 1228:Other types 1030:Other types 836:18 Lodestar 746:Vega family 547:16 November 479:Connor, R. 385:Performance 357:Powerplant: 154:rigid rotor 3732:Categories 2979:helicopter 1729:Trident II 1699:High Virgo 1663:Big Dipper 1577:Senior Peg 1480:X-44 (UAV) 1373:P-7 LRAACA 1358:S-3 Viking 1219:X-44 MANTA 846:43 Harpoon 841:37 Ventura 829:414 Hudson 814:10 Electra 778:7 Explorer 763:4 Explorer 739:Transports 520:8 November 507:Vertiflite 462:References 365:turboshaft 130:helicopter 49:helicopter 3636:CH-3/HH-3 2998:U.S. Navy 2994:U.S. Army 1724:Trident I 1709:Ping-Pong 1562:Have Blue 1363:P-3 Orion 1047:Excalibur 798:DL.1 Vega 586:27 August 467:Citations 307:Data from 278:Model 286 184:USS  126:Model 186 106:1962–1964 2397:400 (II) 2277:282 (II) 1719:Poseidon 1687:Missiles 1668:Explorer 1493:Trainers 783:8 Sirius 727:Lockheed 626:cite web 423:See also 247:Variants 213:turbojet 2985:systems 2392:400 (I) 2272:282 (I) 1757:numbers 1745:J37/T35 1738:Engines 1714:Polaris 1704:Perseus 1460:Polecat 1455:MQM-105 1425:Aequare 1188:CL-1200 1178:NF-104A 1052:JetStar 958:EC-130H 793:9 Orion 333:Height: 327:Length: 186:Ozbourn 98:History 70:Retired 1526:CL-475 1470:RQ-170 1430:AQM-60 1389:CL-400 1338:Hudson 1183:CL-288 1168:XF-104 1074:Saturn 1069:L-2000 1016:CP-140 980:WC-130 975:MC-130 970:LC-130 965:KC-130 953:EC-130 948:HC-130 943:DC-130 938:AC-130 933:C-130J 907:EC-121 887:L-1249 882:L-1049 768:5 Vega 672:  404:Range: 272:XH-51N 260:XH-51A 232:N265LC 221:XH-51N 158:CL-475 67:Status 3706:H-139 3597:J/T/W 3505:MH-60 3500:HH-60 3495:SH-60 3490:UH-60 3486:H-60 3437:CH-53 3433:H-53 3346:H-13J 3341:H-13F 3148:H-13J 2870:27–32 2805:12–14 1755:Model 1694:Agena 1673:L-402 1612:X-26B 1607:X-24C 1592:XC-35 1572:L-301 1567:L-133 1531:XH-51 1510:T-50A 1475:SR-72 1312:YF-12 1275:YP-24 1270:XF-90 1265:XFM-2 1260:F-117 1235:A-4AR 1214:FB-22 1204:YF-22 1173:F-104 1121:XP-58 1116:XP-49 1042:C-141 1001:L-188 985:L-100 928:C-130 912:XB-30 902:C-121 877:L-749 872:L-649 867:L-049 514:(PDF) 503:(PDF) 321:Crew: 228:N286L 22:XH-51 3694:H-92 3689:H-90 3671:OH-6 3666:MH-6 3661:AH-6 3657:H-6 3641:SH-3 3632:H-3 3606:UH-1 3593:AH-1 3572:H-73 3567:H-72 3562:H-71 3557:H-70 3552:H-69 3547:H-68 3542:H-67 3537:H-66 3532:H-65 3527:H-64 3522:H-63 3517:H-62 3512:H-61 3482:H-59 3477:H-58 3472:H-57 3467:H-56 3462:H-55 3457:H-54 3429:H-52 3424:H-51 3419:H-50 3414:H-49 3409:H-48 3404:H-47 3399:H-46 3383:H-43 3378:H-37 3373:H-34 3368:H-25 3363:H-23 3358:H-21 3353:H-19 3336:H-13 3305:H-45 3300:H-44 3295:H-43 3290:H-42 3285:H-41 3280:H-40 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230:and 165:and 140:and 120:The 83:NASA 44:Type 3653:H-5 3648:H-4 3621:H-2 3588:H-1 3123:H-9 3118:H-6 3113:H-5 3062:R-9 3057:R-8 3052:R-7 3047:R-6 3042:R-5 3037:R-4 3032:R-3 3027:R-2 3022:R-1 2597:995 2592:985 2587:984 2582:981 2577:980 2572:977 2567:949 2562:934 2557:915 2552:901 2547:880 2542:849 2537:840 2532:823 2527:822 2522:785 2517:780 2512:760 2507:749 2502:704 2497:685 2492:680 2487:649 2482:645 2477:622 2472:595 2467:580 2462:549 2457:522 2452:520 2447:500 2442:489 2437:480 2432:475 2427:449 2422:437 2417:422 2412:414 2407:407 2402:402 2387:389 2382:382 2377:380 2372:379 2367:351 2362:349 2357:346 2352:331 2347:330 2342:329 2337:325 2332:322 2327:320 2322:301 2317:300 2312:298 2307:296 2302:295 2297:293 2292:288 2287:286 2282:285 2267:249 2262:246 2257:245 2252:244 2247:222 2242:212 2237:210 2232:207 2227:206 2222:204 2217:200 2212:199 2207:193 2202:189 2197:188 2192:186 2187:185 2182:182 2177:171 2172:170 2167:149 2162:144 2157:141 2152:140 2147:137 2142:136 2137:133 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2780:4 2775:3 2770:2 2765:1 2632:A 1812:9 1800:8 1795:7 1790:6 1785:5 1780:4 1775:3 1770:2 1765:1 773:6 719:e 712:t 705:v 678:. 634:) 590:. 551:. 524:. 323:2 124:( 93:3

Index


helicopter
Manufacturer
Lockheed Corporation
United States Army
NASA
helicopter
Lockheed Aircraft
United States Army
United States Navy
rigid rotor
CL-475
Bell OH-13 Sioux
Hiller OH-23 Raven

USS Ozbourn
Pratt & Whitney Canada PT6B-9
Technology Research and Evaluation Command
compound helicopter
Pratt & Whitney J60-2
turbojet
Lockheed AH-56 Cheyenne

United States Army Aviation Museum
Fort Novosel
Pratt & Whitney Canada PT6
turboshaft
Lockheed CL-475
AH-56 Cheyenne
List of United States military helicopters

Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.

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