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Keystone LB-6

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468: 444: 29: 191: 183: 159:(serial number 27-344) with an LB-5A tail unit; longer (75 foot) straight-chord, untapered and noticeably swept-back wings; and 525 hp (391 kW) Wright Cyclone R-1750-1 radial engines suspended on struts between the wings rather than mounted on the lower wing. This produced a bomber with twice the rate of climb as the LB-5 and slightly faster cruise speed. Production LB-6s featured a five-foot longer fuselage. 199:
which she will drop bomb flares on the city and make a return flight to the Dayton army field. The flight is to be a practicable demonstration by the Army Air Corp of the value of refueling airplanes in the air when engaged in bombing expeditions over a long distance". The aircraft was wrecked in August the same year.
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According to an article in the Baltimore Sun the XLB-12 Prototype was used on a refueling and bombing trial in April 1929. Big Bomber to be Refueled during Flight "The huge twin-motored army bomber (sic) which will take off from Dayton, O., fly to New York City and be refueled while in midair, after
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from "LB-" (Light bomber) to "B-", but were delivered after the change. Although delivered as bombers, they saw service as cargo and observation aircraft. The LB-10 variant became the basis of the B-3 through B-6 bombers, all of which used the original LB-6 design, and which served as the primary
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The LB-6/LB-7 was the first operational service model of a 13,000 lb (5,897 kg) twin-tail biplane bomber of a series produced by Keystone. 35 served operationally between 1929 and 1934. A number of variants were built for test and evaluation purposes but never placed into production or
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for production in early 1928 and although the Curtiss aircraft was clearly the better of the two, the conservative Army Air Corps leadership chose the Wright-powered LB-6 and the Pratt & Whitney-powered LB-7, ordering 35 aircraft.
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Beginning in March 1931 the surviving bombers in the Continental United States were taken out of front-line service, re-designated the ZLB-6 and ZLB-7, and sent to the 40th School Squadron at
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Proposed version with 525 hp (391 kW) GR-1690 Hornet A engines; seven ordered, but re-engined and re-designated before production. Five delivered as the
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Proposed version with 575 hp (429 kW) GR-1860 Hornet B engines; three ordered, but re-engined and re-designated before production. Delivered as the
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service. The LB-10 variant became the basis for the B-3 to B-6 series of similar bombers that were the last biplane bombers ordered by the Air Corps.
1114: 761: 756: 751: 746: 741: 736: 731: 647: 478: 1858: 1843: 797: 1092: 251: 1620: 285:, where all were scrapped or surveyed by April 1935. The Hawaiian LB-6s served until 1934, when they too were surveyed in-situ. 701:
https://www.criticalpast.com/video/65675072639_recovery-of-LB-7-aircraft_recovery-team_Major-William-Blackburn_inspect-remains
1853: 1107: 336: 326: 719: 267: 243: 258:, between July and September 1929. In May 1930 three LB-6s were re-engined to become LB-7s and transferred to the 1792: 790: 293:
The frame of a USAAC LB-7 aircraft which crashed in Nicaragua in 1931 was still intact when inspected in 1969.
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Similar to the LB-7, with 575 hp (429 kW) R-1860-1 Hornet B engines for evaluation.
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bombardment force of the Army Air Corps prior to the advent of the monoplane bomber.
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The remaining variants were ordered before the 1930 change of designators by the
238:, between January and September 1929. The nine remaining LB-6s were sent to the 1563: 1489: 1474: 1449: 1173: 1029: 876: 231: 689: 155:
The Keystone XLB-6 prototype was created by refitting the final triple-tailed
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One LB-6 re-engined with 525 hp (391 kW) R-1690-3 Hornet A engines.
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One LB-6 re-engined with 525 hp (391 kW) R-1750-3s for evaluation.
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1931 designation of two LB-6 and the LB-11 (in 1933) as training aircraft.
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LB-11 re-engined with 525 hp (391 kW) GR-1750s for evaluation.
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by the company, but adoption of the name was rejected by the U.S. Army.
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1929 note attached to original 1929 AP photo from Baltimore Sun archive
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engines, 18 built in 1929 and three LB-6s re-engined as LB-7s in 1930.
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2 Ă— trainable .303 in (7.7 mm) Lewis guns in open dorsal position
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The Illustrated Encyclopedia of Aircraft (Part Work 1982–1985)
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radial engines of 525 hp (391 kW), 17 built in 1929.
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The LB-7 used the same extended-span LB-6 airframe powered by
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Production version of the XLB-10, 63 built, all redesignated
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Eight LB-6s and all operational LB-7s were delivered to the
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Keystone Panther 3-view drawing from Aero Digest July 1928
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with Pratt & Whitney engines; the remaining 27 became
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U.S.Military Aircraft Designations and Serials since 1909
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1 Ă— trainable .303 in (7.7 mm) Lewis gun in ventral hatch
714:, p. 135. Midland Counties Publications, 1979. 479:
Keystone LB-6, National Museum of the USAF fact page
345:One LB-7 re-engined with 575 hp (429 kW) 335:One LB-7 re-engined with 550 hp (410 kW) 431:1931 designation of ten LB-7 as training aircraft. 1825: 648:List of military aircraft of the United States 1108: 791: 767:"Looking Down on Uncle Sam's Latest Bomber" 690:https://aviation-safety.net/wikibase/106785 274:, where they were all written off in 1931. 138: 1115: 1101: 798: 784: 567:632 mi (1,017 km, 549 nmi) 1138:bomber designations, Army/Air Force and 555:114 mph (183 km/h, 99 kn) 466: 462: 189: 181: 728:, p. 2255. Orbis Publishing, 1985. 561:95 mph (153 km/h, 83 kn) 16:1927 bomber aircraft family by Keystone 1826: 540:radial engines , 525 hp (391 kW) each 288: 177: 1096: 779: 518:1,148 sq ft (106.38 m) 143:The LB-6 was in competition with the 1859:Twin piston-engined tractor aircraft 325:LB-6 with 525 hp (391 kW) 1844:1920s United States bomber aircraft 500:49 ft 3 in (15.01 m) 337:Pratt & Whitney R-1860 Hornet B 327:Pratt & Whitney R-1690 Hornet A 13: 506:75 ft 0 in (23.0 m) 14: 1870: 512:18 ft 1 in (5.5 m) 442: 27: 592:2 Ă— trainable .303 in (7.7 mm) 367:prior to delivery. 36 built as 762:Keystone LB-14, NMUSAF article 757:Keystone LB-13, NMUSAF article 752:Keystone LB-10, NMUSAF article 747:Keystone LB-9, NUMUSAF article 694: 683: 669: 660: 579:600 ft/min (180 m/s) 530:13,440 lb (6,100 kg) 349:geared engines for evaluation. 1: 811:Keystone and Keystone-Loening 742:Keystone LB-8, NMUSAF article 737:Keystone LB-7, NMUSAF article 732:Keystone LB-6, NMUSAF article 653: 573:11,650 ft (3,550 m) 524:7,024 lb (3,186 kg) 1854:Aircraft first flown in 1927 457:United States Army Air Corps 435: 171:United States Army Air Corps 129:United States Army Air Corps 123:light bombers, built by the 92:United States Army Air Corps 7: 1781:Fighter-bomber, in F-series 609: 296: 10: 1875: 1801: 1780: 1759: 1752: 1729: 1701: 1288: 1258: 1237: 1156: 1147: 1059: 1043: 1022: 1006: 965: 859: 819:Manufacturer designations 818: 35: 26: 21: 596:in open position in nose 315:Production version with 309:modified for evaluation. 139:Design & development 605:2,000 lb (910 kg) Bombs 538:Wright Cyclone R-1750-1 485:General characteristics 339:engines for evaluation. 317:Wright R-1750-1 Cyclone 472: 195: 187: 1760:Redesignated A-series 470: 463:Specifications (LB-6) 194:XLB-12 port-side view 193: 185: 1730:Tri-Service sequence 1023:Observation aircraft 375:with Wright engines. 44:Biplane light bomber 615:Related development 289:Surviving airframes 264:6th Composite Group 248:5th Composite Group 244:72nd Bomb Squadrons 208:96th Bomb Squadrons 178:Operational history 164:Pratt & Whitney 105:18 production LB-7 1148:Original sequences 473: 260:25th Bomb Squadron 224:11th Bomb Squadron 196: 188: 103:17 production LB-6 88:Primary user 1834:Keystone aircraft 1821: 1820: 1817: 1816: 1702:Long-range bomber 1284: 1283: 1090: 1089: 769:Popular Mechanics 272:Panama Canal Zone 125:Keystone Aircraft 109: 108: 56:Keystone Aircraft 1866: 1757: 1756: 1154: 1153: 1117: 1110: 1103: 1094: 1093: 800: 793: 786: 777: 776: 703: 698: 692: 687: 681: 680: 673: 667: 664: 587: 571:Service ceiling: 548: 487: 448: 446: 445: 186:XLB-12 prototype 166:Hornet engines. 127:company for the 100: 46:Type of aircraft 31: 19: 18: 1874: 1873: 1869: 1868: 1867: 1865: 1864: 1863: 1824: 1823: 1822: 1813: 1797: 1776: 1748: 1731: 1725: 1703: 1697: 1290: 1280: 1254: 1233: 1149: 1143: 1121: 1091: 1086: 1055: 1039: 1018: 1007:Patrol aircraft 1002: 961: 855: 814: 804: 707: 706: 699: 695: 688: 684: 675: 674: 670: 665: 661: 656: 612: 588: 583: 544: 483: 465: 443: 441: 438: 347:Wright GR-1750B 299: 291: 180: 141: 104: 98: 47: 17: 12: 11: 5: 1872: 1862: 1861: 1856: 1851: 1846: 1841: 1836: 1819: 1818: 1815: 1814: 1812: 1811: 1805: 1803: 1799: 1798: 1796: 1795: 1790: 1784: 1782: 1778: 1777: 1775: 1774: 1769: 1763: 1761: 1754: 1753:Non-sequential 1750: 1749: 1747: 1746: 1741: 1735: 1733: 1732:(1962–current) 1727: 1726: 1724: 1723: 1718: 1713: 1707: 1705: 1699: 1698: 1696: 1695: 1690: 1685: 1680: 1675: 1670: 1665: 1660: 1655: 1650: 1645: 1640: 1635: 1630: 1625: 1624: 1623: 1618: 1608: 1603: 1598: 1593: 1588: 1583: 1578: 1577: 1576: 1566: 1561: 1556: 1555: 1554: 1544: 1539: 1534: 1529: 1524: 1519: 1514: 1509: 1504: 1499: 1494: 1493: 1492: 1487: 1477: 1472: 1467: 1462: 1457: 1452: 1447: 1446: 1445: 1435: 1430: 1425: 1420: 1415: 1410: 1405: 1400: 1395: 1390: 1385: 1380: 1375: 1370: 1365: 1360: 1355: 1350: 1345: 1340: 1335: 1330: 1325: 1320: 1315: 1310: 1305: 1300: 1294: 1292: 1286: 1285: 1282: 1281: 1279: 1278: 1273: 1268: 1262: 1260: 1256: 1255: 1253: 1252: 1247: 1241: 1239: 1235: 1234: 1232: 1231: 1226: 1221: 1216: 1211: 1206: 1201: 1196: 1191: 1186: 1181: 1176: 1171: 1166: 1160: 1158: 1151: 1145: 1144: 1120: 1119: 1112: 1105: 1097: 1088: 1087: 1085: 1084: 1079: 1074: 1069: 1063: 1061: 1057: 1056: 1054: 1053: 1047: 1045: 1044:Scout aircraft 1041: 1040: 1038: 1037: 1032: 1026: 1024: 1020: 1019: 1017: 1016: 1010: 1008: 1004: 1003: 1001: 1000: 995: 990: 985: 980: 975: 969: 967: 963: 962: 960: 959: 954: 949: 944: 939: 934: 929: 924: 919: 914: 909: 904: 899: 894: 889: 884: 879: 874: 869: 863: 861: 857: 856: 854: 853: 848: 843: 838: 833: 828: 822: 820: 816: 815: 803: 802: 795: 788: 780: 774: 773: 764: 759: 754: 749: 744: 739: 734: 729: 723: 710:John Andrade. 705: 704: 693: 682: 668: 658: 657: 655: 652: 651: 650: 639: 638: 633: 628: 623: 611: 608: 607: 606: 603: 600: 597: 581: 580: 577:Rate of climb: 574: 568: 562: 556: 553:Maximum speed: 542: 541: 531: 525: 519: 513: 507: 501: 495: 464: 461: 460: 459: 453: 452: 437: 434: 433: 432: 429: 426: 423: 420: 413: 408: 397: 394: 391: 388: 385: 382: 379: 376: 361: 356: 353: 350: 343: 340: 333: 330: 323: 320: 313: 310: 303: 298: 295: 290: 287: 246:, attached to 232:Rockwell Field 228:7th Bomb Group 212:2nd Bomb Group 179: 176: 140: 137: 107: 106: 101: 95: 94: 89: 85: 84: 81: 77: 76: 73: 69: 68: 63: 59: 58: 53: 49: 48: 45: 42: 38: 37: 36:Keystone LB-7 33: 32: 24: 23: 15: 9: 6: 4: 3: 2: 1871: 1860: 1857: 1855: 1852: 1850: 1847: 1845: 1842: 1840: 1839:Light bombers 1837: 1835: 1832: 1831: 1829: 1810: 1807: 1806: 1804: 1800: 1794: 1791: 1789: 1786: 1785: 1783: 1779: 1773: 1770: 1768: 1765: 1764: 1762: 1758: 1755: 1751: 1745: 1742: 1740: 1737: 1736: 1734: 1728: 1722: 1719: 1717: 1714: 1712: 1709: 1708: 1706: 1700: 1694: 1691: 1689: 1686: 1684: 1681: 1679: 1676: 1674: 1671: 1669: 1666: 1664: 1661: 1659: 1656: 1654: 1651: 1649: 1646: 1644: 1641: 1639: 1636: 1634: 1631: 1629: 1626: 1622: 1619: 1617: 1614: 1613: 1612: 1609: 1607: 1604: 1602: 1599: 1597: 1594: 1592: 1589: 1587: 1584: 1582: 1579: 1575: 1572: 1571: 1570: 1567: 1565: 1562: 1560: 1557: 1553: 1550: 1549: 1548: 1545: 1543: 1540: 1538: 1535: 1533: 1530: 1528: 1525: 1523: 1520: 1518: 1515: 1513: 1510: 1508: 1505: 1503: 1500: 1498: 1495: 1491: 1488: 1486: 1483: 1482: 1481: 1478: 1476: 1473: 1471: 1468: 1466: 1463: 1461: 1458: 1456: 1453: 1451: 1448: 1444: 1441: 1440: 1439: 1436: 1434: 1431: 1429: 1426: 1424: 1421: 1419: 1416: 1414: 1411: 1409: 1406: 1404: 1401: 1399: 1396: 1394: 1391: 1389: 1386: 1384: 1381: 1379: 1376: 1374: 1371: 1369: 1366: 1364: 1361: 1359: 1356: 1354: 1351: 1349: 1346: 1344: 1341: 1339: 1336: 1334: 1331: 1329: 1326: 1324: 1321: 1319: 1316: 1314: 1311: 1309: 1306: 1304: 1301: 1299: 1296: 1295: 1293: 1289:Main sequence 1287: 1277: 1274: 1272: 1269: 1267: 1264: 1263: 1261: 1257: 1251: 1248: 1246: 1243: 1242: 1240: 1238:Medium bomber 1236: 1230: 1227: 1225: 1222: 1220: 1217: 1215: 1212: 1210: 1207: 1205: 1202: 1200: 1197: 1195: 1192: 1190: 1187: 1185: 1182: 1180: 1177: 1175: 1172: 1170: 1167: 1165: 1162: 1161: 1159: 1155: 1152: 1146: 1141: 1137: 1133: 1129: 1125: 1118: 1113: 1111: 1106: 1104: 1099: 1098: 1095: 1083: 1080: 1078: 1075: 1073: 1070: 1068: 1065: 1064: 1062: 1058: 1052: 1049: 1048: 1046: 1042: 1036: 1033: 1031: 1028: 1027: 1025: 1021: 1015: 1012: 1011: 1009: 1005: 999: 996: 994: 991: 989: 986: 984: 981: 979: 976: 974: 971: 970: 968: 964: 958: 955: 953: 950: 948: 945: 943: 940: 938: 935: 933: 930: 928: 925: 923: 920: 918: 915: 913: 910: 908: 905: 903: 900: 898: 895: 893: 890: 888: 885: 883: 880: 878: 875: 873: 870: 868: 865: 864: 862: 858: 852: 849: 847: 844: 842: 839: 837: 834: 832: 829: 827: 824: 823: 821: 817: 812: 808: 801: 796: 794: 789: 787: 782: 781: 778: 772: 771:, August 1930 770: 765: 763: 760: 758: 755: 753: 750: 748: 745: 743: 740: 738: 735: 733: 730: 727: 724: 721: 720:0-904597-22-9 717: 713: 709: 708: 702: 697: 691: 686: 678: 672: 663: 659: 649: 646: 645: 644: 643: 642:Related lists 637: 634: 632: 629: 627: 624: 622: 619: 618: 617: 616: 604: 601: 598: 595: 591: 590: 589: 586: 578: 575: 572: 569: 566: 563: 560: 559:Cruise speed: 557: 554: 551: 550: 549: 547: 539: 535: 532: 529: 528:Gross weight: 526: 523: 522:Empty weight: 520: 517: 514: 511: 508: 505: 502: 499: 496: 493: 490: 489: 488: 486: 481: 480: 477: 469: 458: 455: 454: 451: 450:United States 440: 439: 430: 427: 424: 421: 418: 414: 412: 409: 406: 403:, two as the 402: 398: 395: 392: 389: 386: 383: 380: 377: 374: 370: 366: 362: 360: 357: 354: 351: 348: 344: 341: 338: 334: 331: 328: 324: 321: 318: 314: 311: 308: 304: 301: 300: 294: 286: 284: 280: 275: 273: 269: 265: 261: 257: 253: 249: 245: 241: 237: 233: 229: 225: 221: 217: 216:Langley Field 213: 209: 205: 200: 192: 184: 175: 172: 167: 165: 160: 158: 157:Keystone LB-5 153: 149: 146: 136: 134: 130: 126: 122: 118: 114: 113:Keystone LB-6 102: 97: 96: 93: 90: 87: 86: 82: 79: 78: 74: 72:Introduction 71: 70: 67: 64: 62:First flight 61: 60: 57: 54: 52:Manufacturer 51: 50: 43: 40: 39: 34: 30: 25: 20: 1259:Heavy bomber 1218: 1213: 1203: 1198: 1193: 1188: 1157:Light bomber 916: 911: 901: 896: 891: 886: 768: 725: 711: 696: 685: 671: 662: 641: 640: 636:Keystone B-6 631:Keystone B-5 626:Keystone B-4 621:Keystone B-3 614: 613: 584: 582: 576: 570: 564: 558: 552: 545: 543: 533: 527: 521: 515: 509: 503: 497: 491: 484: 482: 475: 474: 364: 292: 276: 268:France Field 201: 197: 168: 161: 154: 150: 145:Curtiss XB-2 142: 132: 116: 112: 110: 99:Number built 1704:(1935–1936) 1291:(1930–1962) 1150:(1924–1930) 1140:Tri-Service 807:Huff-Daland 546:Performance 534:Powerplant: 279:Kelly Field 119:were 1920s 1828:Categories 1077:Pathfinder 677:"Keystone" 654:References 594:Lewis guns 516:Wing area: 252:Luke Field 236:California 222:, and the 22:LB-6/LB-7 1067:Air Yacht 504:Wingspan: 476:Data from 436:Operators 266:based at 131:, called 1849:Biplanes 1072:Commuter 966:Trainers 813:aircraft 610:See also 585:Armament 390:(X)LB-12 297:Variants 220:Virginia 121:American 80:Retired 1142:systems 860:Bombers 510:Height: 498:Length: 270:in the 262:of the 226:of the 210:of the 133:Panther 1793:FB-111 1621:RB-57F 1616:RB-57D 1490:NB-36H 1082:Pronto 718:  565:Range: 447:  384:LB-11A 352:XLB-10 256:Hawaii 1802:Other 1788:FB-22 1721:BLR-3 1716:BLR-2 1711:BLR-1 1574:B-50C 1552:B-47C 1485:B-36G 1443:B-29D 1229:LB-14 1224:LB-13 1219:LB-12 1214:LB-11 1209:LB-10 1132:USAAF 1128:USAAC 1124:USAAS 1060:Names 1030:XO-15 937:XHB-1 927:LB-14 922:LB-13 917:LB-12 912:LB-11 907:LB-10 877:XLB-3 872:XLB-1 826:HD.8A 492:Crew: 428:ZLB-7 422:ZLB-6 417:Y1B-5 411:LB-14 405:Y1B-6 401:Y1B-4 396:LB-13 378:LB-11 359:LB-10 302:XLB-6 283:Texas 83:1934 75:1929 41:Role 1809:B-21 1772:B-26 1767:B-20 1693:B-71 1688:B-70 1683:B-69 1678:B-68 1673:B-67 1668:B-66 1663:B-65 1658:B-64 1653:B-63 1648:B-62 1643:B-61 1638:B-60 1633:B-59 1628:B-58 1611:B-57 1606:B-56 1601:B-55 1596:B-54 1591:B-53 1586:B-52 1581:B-51 1569:B-50 1564:B-49 1559:B-48 1547:B-47 1542:B-46 1537:B-45 1532:B-44 1527:B-43 1522:B-42 1517:B-41 1512:B-40 1507:B-39 1502:B-38 1497:B-37 1480:B-36 1475:B-35 1470:B-34 1465:B-33 1460:B-32 1455:B-31 1450:B-30 1438:B-29 1433:B-28 1428:B-27 1423:B-26 1418:B-25 1413:B-24 1408:B-23 1403:B-22 1398:B-21 1393:B-20 1388:B-19 1383:B-18 1378:B-17 1373:B-16 1368:B-15 1363:B-14 1358:B-13 1353:B-12 1348:B-11 1343:B-10 1276:HB-3 1271:HB-2 1266:HB-1 1204:LB-9 1199:LB-8 1194:LB-7 1189:LB-6 1184:LB-5 1179:LB-4 1174:LB-3 1169:LB-2 1164:LB-1 1136:USAF 1051:XS2L 993:AT-2 988:AT-1 983:TW-5 978:TA-6 973:TA-2 932:XB-1 902:LB-9 897:LB-8 892:LB-7 887:LB-6 882:LB-5 867:LB-1 851:K-85 846:K-84 841:K-78 836:K-55 831:K-47 716:ISBN 536:2 Ă— 494:Five 373:B-5s 369:B-3A 365:B-3A 342:LB-9 332:LB-8 322:LB-7 312:LB-6 307:LB-5 305:One 242:and 240:23rd 206:and 204:20th 117:LB-7 115:and 111:The 66:1927 1744:B-2 1739:B-1 1338:B-9 1333:B-8 1328:B-7 1323:B-6 1318:B-5 1313:B-4 1308:B-3 1303:B-2 1298:B-1 1250:B-2 1245:B-1 1035:XOK 957:B-6 952:B-5 947:B-4 942:B-3 250:at 230:at 214:at 1830:: 1014:PK 998:NK 809:, 281:, 254:, 234:, 218:, 1134:/ 1130:/ 1126:/ 1116:e 1109:t 1102:v 799:e 792:t 785:v 722:. 679:. 419:. 407:.

Index


Keystone Aircraft
1927
United States Army Air Corps
American
Keystone Aircraft
United States Army Air Corps
Curtiss XB-2
Keystone LB-5
Pratt & Whitney
United States Army Air Corps


20th
96th Bomb Squadrons
2nd Bomb Group
Langley Field
Virginia
11th Bomb Squadron
7th Bomb Group
Rockwell Field
California
23rd
72nd Bomb Squadrons
5th Composite Group
Luke Field
Hawaii
25th Bomb Squadron
6th Composite Group
France Field

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