29:
1767:
1748:
1721:
433:
1241:
1249:
223:. The flight lasted 30 minutes. This began a four-phase flight test program, to culminate with reaching a planned 250-knot top speed. The X2 completed flights with its propeller fully engaged in July 2009. Sikorsky completed phase three of the testing with the X2 reaching 181 knots in test flight in late May 2010.
240:
On 15 September 2010, test pilot Kevin
Bredenbeck achieved Sikorsky's design goal for the X2 when he flew it at a speed of 250 knots (290 mph; 460 km/h) in level flight, an unofficial speed record for a helicopter. The demonstrator then reached a new record speed of 260 knots (300 mph;
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1790:
1532:
1529:
293:"...For demonstrating a revolutionary 250 knot helicopter, which marks a proven departure point for the future development of helicopters by greatly increasing their speed, maneuverability and utility." For 2011, the X2 team received the Howard Hughes Award (
192:
to reduce drag by 40%, and test flew fairings on the hubs themselves but not the central hub fairing ("aero sail") in between the hubs. Sikorsky has since patented a "Standpipe" (fixed tube between rotating rotor axes) suitable for a central hub fairing.
689:
676:
1548:
1786:
1519:
260:
On 14 July 2011, the X2 completed its final flight and was officially retired after accumulating 22 hours over 23 test flights. With the end of development, the X2 will be followed by its first application, the
926:
172:
rather than the rotor. Unusually for helicopters, the power required for high speed is more than the hover power. The pilot controls the independent propeller power with a thumb wheel on the collective.
1426:
1668:
672:
226:
On 26 July 2010, Sikorsky announced that the X2 exceeded 225 knots (259 mph; 417 km/h) during flight testing in West Palm Beach
Florida, unofficially surpassing the current FAI
1626:
1493:
1805:
1817:
895:
1054:
245:
technology demonstrator helicopter. Sikorsky states that the X2 has the same noise level at 200 knots that a regular helicopter has at 100 knots. Above 200 knots, the
1131:
815:
1272:
1071:
863:
918:
596:
the helicopter vibrated so much at these higher speeds that its pilots struggled to control it .. The heavy and fuel-hungry jets pushed the aircraft to high speed
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1826:
1082:
780:
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583:
547:
952:
1143:
2640:
802:
741:
738:
726:
716:
705:
1107:
647:
1468:
1658:
1443:
133:
Sikorsky developed the X2 helicopter on a $ 50 million budget. The design includes expertise gathered from several earlier design projects. The
28:
624:
1171:
528:
1051:
752:
1870:
1618:
1802:
1014:
2645:
1814:
1184:"X2 Technology Demonstrator Achieves 225 Knots, Sets New Top Speed for Helicopter - Target Milestone of 250 Knots Looms in Q3 2010"
1124:
835:
1163:
885:
1836:
1041:
2655:
1444:"Award-Winning X2 Technology Demonstrator Takes its Final Flight - Program paved the way for upcoming S-97 Raider helicopter"
970:
188:, and propeller by Aero Composites. The rotor hub can have 10-20 times the drag of the blade. Sikorsky intended to test hub
1404:
1201:
2528:
1276:
1223:
1067:
1046:
860:
684:
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991:
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is about twice that of a conventional helicopter. Hands-off flying was also successfully performed during flight tests.
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607:
219:
The X2 first flew on 27 August 2008 from
Schweizer Aircraft, a division of Sikorsky Aircraft Corporation's facility at
2630:
141:
with auxiliary propulsion supplied using two jet engines, but that vibration and fuel consumption was excessive; the
2584:
2374:
2364:
461:
1863:
1831:
772:
290:
1371:
2469:
2344:
1427:"Sikorsky X2 rotorcraft prototype makes final flight after proving technology for S-97 scout/attack helicopter"
220:
1174:(FAI). Note search under E-1 Helicopters and "Speed over a straight 15/25 km course". Accessed: 26 April 2014.
2620:
2474:
2354:
1389:
633:
266:
230:
1738:
794:
1827:"Hyper Helos: Prototypes coming off the drawing board and into the race", Flight International, 3 July 2008
723:
713:
702:
204:
948:
2464:
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1843:
1579:
294:
270:
1337:
Experimental
Investigation and Fundamental Understanding of a Slowed UH-60A Rotor at High Advance Ratios
1336:
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1757:
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329:
1574:
1460:
2521:
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1680:
Note: this is the disc area of one rotor set, not the effective area of the whole coaxial rotors set.
1593:
1095:
U.S. Army
Selects Bell and Sikorsky/Boeing to Build Prototypes for Next Generation Helicopter Program
165:
621:
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480 km/h) in a shallow 2˚ to 3˚ dive, which was just short of the 303 mph achieved by the
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2001:
1996:
1961:
1956:
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The
Sikorsky Aircraft Corporation and the X2 Technology Demonstrator Team was awarded the 2010
55:
1304:
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415:
145:
expanded the company's knowledge of the unique aspects of coaxial flight control laws with a
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208:
197:
169:
8:
1734:
274:
181:
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114:
48:
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1383:
D. Walsh, S. Weiner, K. Arifian, T. Lawrence, M. Wilson, T. Millott and R. Blackwell. "
505:
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64:
839:
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1879:
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1160:
552:
466:
122:
60:
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975:
958:
757:
189:
177:
137:
Advancing Blade
Concept Demonstrator had shown that high speed was possible with a
1631:
We started with X2 technology demonstrator at about 6,000lbs (2.7t) gross weight.
816:
Sikorsky
Innovations Introduces X2 Technology™ Light Tactical Helicopter Simulator
478:
2594:
2564:
2516:
2144:
2011:
1821:
1809:
1555:
1536:
1167:
995:
867:
730:
720:
709:
680:
628:
438:
150:
142:
703:
Advanced rotor designs break conventional helicopter speed restrictions (page 1)
2479:
2454:
2412:
2389:
2384:
2379:
2262:
2242:
2149:
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2086:
180:
were combined to improve test procedure. The fly-by-wire system is provided by
138:
118:
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1751:
1724:
1318:
998:
211:
program based on the X2 principle, which was approved by the Army in
October.
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2599:
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2444:
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2349:
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2334:
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2319:
2314:
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2197:
2159:
2134:
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2066:
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2046:
2041:
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2026:
2021:
2016:
2006:
1991:
1986:
1981:
1976:
1971:
1966:
1951:
1946:
1941:
1560:
1524:
1325:, Summer 2006. Quote: "Ultimately, the XH-59A achieved an incredible 303 mph"
988:
579:
493:
451:
242:
234:
134:
2429:
2424:
2419:
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2202:
2192:
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1936:
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1926:
1921:
1916:
1911:
1906:
1901:
1896:
1019:
890:
246:
184:, the rotor by Eagle Aviation Technologies, anti-vibration technology from
157:
1594:"Design and Performance of Lift-Offset Rotorcraft for Short-Haul Missions"
153:
developed expertise in composite rotors and advanced transmission design.
2139:
1083:
Sikorsky and Boeing to pitch ‘X-2’-based design for US Army JMR TD effort
483:
250:
146:
125:, that made its first flight in 2008 and was officially retired in 2011.
1803:"Sikorsky Calls X2 Shape of the Future", Aviation Week, 25 February 2008
1691:"Sikorsky X2 Technology™ Demonstrator Achieves 250-Knot Speed Milestone"
1242:"Sikorsky X2 Technology Demonstrator Achieves 250-Knot Speed Milestone"
363:
359:
227:
378:
548 sq ft (50.9 m) contra-rotating four-bladed coaxial.
1796:
1363:
488:
1848:
1815:"Sikorsky X2 In Blades-On Ground Tests", Aviation Week, 21 May 2008
1645:"High airspeed testing of the Sikorsky X2 Technology™ demonstrator"
185:
1385:
High
Airspeed Testing of the Sikorsky X2 Technology Demonstrator
622:
Sikorsky to Build and Test X2 Technology Demonstrator Helicopter
1042:
Sikorsky Talks To Customers About Potential Raider Applications
957: "Counter-rotating Rotor System With Stationary Standpipe"
548:"Inside Sikorsky's Speed-Record-Breaking Helicopter Technology"
164:
two feet apart, active force counter-vibration inspired by the
265:
high-speed scout and attack helicopter. It was donated to the
1619:"ANALYSIS: Sikorsky seeks next leap in rotorcraft technology"
1270:
310:
NOTE: No other specifications have been released by Sikorsky.
233:
of 216 knots (249 mph; 400 km/h) set by a modified
352:
5,300 lb (2,404 kg) –6,000 lb (2,700 kg)
1600:
1342:
1144:"Sikorsky completes third-phase X2 tests with 181kt flight"
1108:"Sikorsky high-speed X2 prototype starts flight-test phase"
871:
861:
Rotor Performance at High Advance Ratio: Theory versus Test
573:
1161:
Rotorcraft Absolute: Speed over a straight 15/25 km course
1068:
Sikorsky and Boeing Team Submit New Army Helicopter Design
1070:" - News.USNI.org, 17 June 2014. Accessed: 19 June 2014.
168:, and using most of the power in forward flight for the
1500:. Helicopter Association International. 28 October 2016
874:/CR—2008–215370, October 2008. Accessed: 13 April 2014.
648:"Sikorsky X2 sets unofficial helicopter speed record"
428:
1319:
Hybrid Helicopters: Compounding the Quest for Speed
473:
Aircraft of comparable role, configuration, and era
1844:Sikorsky X-2 at the Stuart Air Show, Nov 11, 2011
1015:"Sikorsky rolls-out high-speed Raider rotorcraft"
253:0.9, the rotor disc is slightly nose-up, and the
2612:
1271:Finnegan, Joy editor-in-chief (1 October 2010).
639:
529:"Sikorsky's X2 speedster completes first flight"
196:On 4 May 2009, Sikorsky unveiled a mockup of a
1454:
1452:
1405:"Sikorsky's Record-Setting Helicopter Retires"
801:, 9 September 2011. Accessed: 4 October 2014.
198:Light Tactical Helicopter derivative of the X2
1864:
1520:Sikorsky's X2 - Collier Win, Commercial Next?
910:
886:"Sikorsky X2 breaks helicopter speed barrier"
830:
828:
574:Thomas Lawrence; David Jenney (31 Aug 2010).
1461:"Sikorsky X2 Helicopter Reaching New Speeds"
1153:
1060:
1050:, 6 October 2014. Accessed: 3 October 2014.
249:from 446 to 360 RPM to keep tip speed below
203:In June 2014, Sikorsky/Boeing submitted the
200:, and unveiled a prototype in October 2014.
1449:
1402:
1370:, 18 September 2010. Accessed: April 2014.
1199:
753:X2 marks the spot for radical rotor designs
523:
521:
16:Experimental high-speed compound helicopter
1871:
1857:
1494:"Sikorsky X2 joins Smithsonian collection"
1125:"Sikorsky X2 Flies With Engaged Propeller"
825:
688:, 27 August 2008. Accessed: 9 March 2012.
399:290 mph (460 km/h, 250 kn)
2641:2000s United States experimental aircraft
1585:
1528:, Mar 16, 2011. Accessed: March 8, 2014.
1393:, May 4, 2011. Accessed: October 5, 2013.
1224:"Sikorsky's X2 chases world speed record"
877:
737:, September 2012. Accessed: 10 May 2014.
269:in October 2016 and is on display in the
128:
1667:, 17 June 2014. Accessed: 19 June 2014.
1564:, Mar 23, 2011. Accessed: March 8, 2014.
1446:, Sikorsky Aircraft Corp., 14 July 2011.
1358:
1356:
1354:
1352:
764:
673:First Flight Of Sikorsky X2 Demonstrator
518:
1797:Sikorsky X2 (proposed) on unicopter.com
1591:
1012:
971:Sikorsky unveils mock-up X2 armed scout
645:
615:
545:
411:0.44 lb/sq ft (2.1 kg/m)
2613:
1837:Aircraft Owners and Pilots Association
1592:Johnson, Wayne (January 18–20, 2012).
1458:
1221:
1172:Fédération Aéronautique Internationale
1006:
916:
372:2 × 26 ft 5 in (8.05 m)
214:
1878:
1852:
1642:
1629:from the original on 30 August 2020.
1377:
1349:
1328:
1085:- Flightglobal.com, February 28, 2013
883:
746:
1616:
1549:Sikorsky's X2 and the Collier Trophy
1498:Helicopter Association International
1311:
1047:Aviation Week & Space Technology
1034:
929:from the original on 11 October 2014
787:
770:
685:Aviation Week & Space Technology
586:from the original on 30 January 2017
541:
539:
537:
405:35 mi (56 km, 30 nmi)
1248:. 15 September 2010. Archived from
666:
567:
546:Goodier, Rob (September 20, 2010).
531:. Flightglobal.com, 27 August 2008.
13:
1481:Weight, empty: 2,404 kg (5,300 lb)
1275:. Rotor & Wing. Archived from
1200:Croft, John (September 15, 2010).
14:
2667:
1701:
1459:Connor, Roger (25 October 2016).
1273:"Sikorsky Breaks 250 KTAS Record"
646:Trimble, Stephen (26 July 2010).
576:"The Fastest Helicopter on Earth"
534:
300:
1765:
1746:
1719:
1659:Sikorsky powers on S-97 avionics
1605:nominal gross weight of 5950 lb.
1471:from the original on 16 May 2020
917:Dubois, Thierry (26 July 2011).
898:from the original on 28 May 2015
783:from the original on 8 May 2019.
771:Fell, William (April–May 2018).
431:
366:, 1,800 shp (1,300 kW)
27:
2646:2000s United States helicopters
1683:
1674:
1651:
1636:
1610:
1567:
1541:
1512:
1486:
1437:
1419:
1396:
1264:
1234:
1215:
1193:
1177:
1136:
1117:
1100:
1097:- News.USNI.org, 3 October 2014
1088:
1076:
1013:Parsons, Dan (2 October 2014),
982:
963:
941:
853:
808:
777:digitaledition.rotorandwing.com
291:National Aeronautic Association
795:Defense Interview: Mark Miller
695:
601:
346:6,000 lb (2,722 kg)
340:5,300 lb (2,404 kg)
113:is an experimental high-speed
1:
1465:National Air and Space Museum
1346:, 2011. Accessed: April 2014.
1202:"Sikorsky X2 hits 250kt goal"
894:. Reed Business Information.
511:
267:National Air and Space Museum
2656:Aircraft first flown in 2008
1779:, pilot and staff commentary
1403:Paur, Jason (15 July 2010).
1222:Varnon, Rob (May 26, 2010).
838:. Flug-Revue. Archived from
462:Sikorsky–Boeing SB-1 Defiant
7:
1799:(patent list at the bottom)
1714:Official Sikorsky X2 videos
1580:American Helicopter Society
1023:, Reed Business Information
923:Aviation International News
884:Croft, John (20 May 2010).
654:. Reed Business Information
424:
295:American Helicopter Society
271:Steven F. Udvar-Hazy Center
10:
2672:
1772:Sikorsky X2 Collier Trophy
1664:United Press International
1617:Drew, James (2016-02-19).
1364:Coaxial - Sikorsky ~ X2 TD
773:"X2 From the Pilot's View"
207:helicopter design for the
2626:Coaxial rotor helicopters
2557:
2398:
2168:
2100:
1887:
1764:
1753:Sikorsky X2 record flight
1745:
1718:
1713:
1708:
1643:Walsh, D (January 2011).
1431:www.militaryaerospace.com
280:
99:
91:
86:
78:
70:
54:
43:
38:
26:
21:
2631:Experimental helicopters
1787:Sikorsky X2 company page
287:Robert J. Collier Trophy
33:Sikorsky X2 Demonstrator
2401:(military designations)
2103:(military designations)
316:General characteristics
156:Other features include
2171:(company designations)
1890:(company designations)
1726:Sikorsky X2 technology
1535:March 9, 2014, at the
1334:Datta, Anubhav et al.
1204:. Flight International
719:July 18, 2013, at the
708:July 18, 2013, at the
679:March 7, 2012, at the
627:July 14, 2008, at the
608:XH-59A / X2 comparison
247:rotor speed is reduced
129:Design and development
2558:Experimental aircraft
2470:CH-53E Super Stallion
1374:on 13 September 2013.
859:Harris, Franklin D. "
799:Defense Media Network
2621:Compound helicopters
2475:CH-53K King Stallion
2101:Fixed-wing aircraft
1888:Fixed-wing aircraft
1820:7 March 2012 at the
1808:7 March 2012 at the
1741:near rotor blade tip
1148:Flight International
1112:Flight International
457:Sikorsky S-97 Raider
370:Main rotor diameter:
221:Horseheads, New York
209:Future Vertical Lift
2002:S-22/23/24/25/26/27
1739:air compressibility
1735:dissymmetry of lift
1657:Tomkins, Richard. "
1575:Howard Hughes Award
1114:, 2 September 2008.
805:on 2 November 2012.
446:Related development
350:Max takeoff weight:
275:Chantilly, Virginia
215:Operational history
115:compound helicopter
49:compound helicopter
39:General information
2465:CH-53 Sea Stallion
1554:2014-03-09 at the
1518:Warwick, Graham. "
1303:has generic name (
1279:on 31 October 2010
1252:on 14 October 2013
1166:2013-12-03 at the
1106:Trimble, Stephen.
1040:Warwick, Graham. "
994:2014-10-04 at the
969:Trimble, Stephen.
866:2013-02-18 at the
729:2013-07-18 at the
527:Trimble, Stephen.
506:List of rotorcraft
255:lift-to-drag ratio
231:world speed record
178:flight simulations
149:aircraft; and the
139:coaxial helicopter
65:Schweizer Aircraft
2608:
2607:
1840:, October 1, 2011
1793:
1791:Archive from 2009
1783:
1782:
1547:Larson, George. "
1317:Robb, Raymond L.
1066:Majumdar, Dave. "
1057:on 3 October 2014
553:Popular Mechanics
467:Sikorsky Raider X
176:Test flights and
123:Sikorsky Aircraft
107:
106:
61:Sikorsky Aircraft
2663:
2565:Cypher/Cypher II
2512:SH-60B/F Seahawk
2507:MH-60R/S Seahawk
2497:HH-60G Pave Hawk
2492:UH-60 Black Hawk
1873:
1866:
1859:
1850:
1849:
1789:
1773:
1769:
1768:
1754:
1750:
1749:
1727:
1723:
1722:
1706:
1705:
1695:
1694:
1687:
1681:
1678:
1672:
1671:on 18 June 2014.
1655:
1649:
1648:
1640:
1634:
1633:
1614:
1608:
1607:
1598:
1589:
1583:
1571:
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1505:
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1435:
1434:
1423:
1417:
1416:
1414:
1412:
1400:
1394:
1381:
1375:
1362:Jackson, Dave. "
1360:
1347:
1332:
1326:
1315:
1309:
1308:
1302:
1298:
1296:
1288:
1286:
1284:
1268:
1262:
1261:
1259:
1257:
1238:
1232:
1231:
1228:Connecticut Post
1219:
1213:
1212:
1210:
1209:
1197:
1191:
1181:
1175:
1157:
1151:
1140:
1134:
1130:, 13 July 2009.
1121:
1115:
1104:
1098:
1092:
1086:
1080:
1074:
1064:
1058:
1038:
1032:
1031:
1030:
1028:
1010:
1004:
986:
980:
976:Flightglobal.com
967:
961:
956:
955:
951:
945:
939:
938:
936:
934:
919:"AgustaWestland"
914:
908:
907:
905:
903:
881:
875:
857:
851:
850:
848:
847:
842:on June 12, 2008
832:
823:
812:
806:
791:
785:
784:
768:
762:
758:Flightglobal.com
750:
744:
701:Chandler, Jay. "
699:
693:
692:on 7 March 2012.
670:
664:
663:
661:
659:
643:
637:
619:
613:
605:
599:
598:
593:
591:
571:
565:
564:
562:
560:
543:
532:
525:
441:
436:
435:
434:
392:
376:Main rotor area:
318:
170:pusher propeller
31:
19:
18:
2671:
2670:
2666:
2665:
2664:
2662:
2661:
2660:
2651:Pusher aircraft
2611:
2610:
2609:
2604:
2553:
2539:CH-124 Sea King
2529:RAH-66 Comanche
2460:HH-52A Seaguard
2400:
2394:
2170:
2164:
2102:
2096:
1889:
1883:
1877:
1832:"Swamp Pirates"
1822:Wayback Machine
1810:Wayback Machine
1771:
1766:
1752:
1747:
1725:
1720:
1709:External videos
1704:
1699:
1698:
1689:
1688:
1684:
1679:
1675:
1656:
1652:
1641:
1637:
1615:
1611:
1596:
1590:
1586:
1572:
1568:
1556:Wayback Machine
1546:
1542:
1537:Wayback Machine
1517:
1513:
1503:
1501:
1492:
1491:
1487:
1474:
1472:
1457:
1450:
1442:
1438:
1433:. 17 July 2011.
1425:
1424:
1420:
1410:
1408:
1401:
1397:
1382:
1378:
1361:
1350:
1333:
1329:
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1255:
1253:
1240:
1239:
1235:
1220:
1216:
1207:
1205:
1198:
1194:
1190:, 15 June 2015.
1182:
1178:
1168:Wayback Machine
1158:
1154:
1141:
1137:
1122:
1118:
1105:
1101:
1093:
1089:
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1603:. p. 4.
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1561:Aviation Week
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500:Related lists
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494:Piasecki X-49
492:
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479:Eurocopter X³
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452:Sikorsky S-69
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47:Experimental
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2636:Slowed rotor
2589:
2450:CH-37 Mojave
2445:H-34 Choctaw
2399:Helicopters
2169:Helicopters
1835:
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1523:
1514:
1502:. Retrieved
1497:
1488:
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1473:. Retrieved
1464:
1439:
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1421:
1409:. Retrieved
1398:
1388:
1379:
1367:
1341:
1335:
1330:
1322:
1313:
1281:. Retrieved
1277:the original
1266:
1256:23 September
1254:. Retrieved
1250:the original
1246:sikorsky.com
1245:
1236:
1227:
1217:
1206:. Retrieved
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1020:Flightglobal
1018:
1008:
1001:
989:S-97 Rollout
984:
974:
965:
943:
931:. Retrieved
922:
912:
900:. Retrieved
891:Flightglobal
889:
879:
855:
844:. Retrieved
840:the original
819:
810:
798:
789:
776:
766:
756:
748:
734:
697:
683:
668:
656:. Retrieved
652:FlightGlobal
651:
641:
632:
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588:. Retrieved
569:
559:22 September
557:. Retrieved
551:
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330:Aspect ratio
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309:
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304:
284:
259:
239:
225:
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205:SB-1 Defiant
202:
195:
175:
162:rigid rotors
155:
132:
110:
108:
103:14 July 2011
92:First flight
79:Number built
56:Manufacturer
2487:CH-54 Tarhe
870:" page 119
735:ProPilotMag
484:Kamov Ka-92
390:Performance
382:Propellers:
356:Powerplant:
308:Flug-Revue
263:S-97 Raider
147:fly-by-wire
135:S-69/XH-59A
111:Sikorsky X2
2615:Categories
1504:5 December
1475:5 December
1340:, page 2.
1323:Vertiflite
1208:2010-09-16
846:2007-06-25
512:References
420:3.66 hp/lb
416:Power/mass
364:turboshaft
360:LHTEC T800
228:rotorcraft
166:Black Hawk
143:Cypher UAV
1368:Unicopter
1283:6 October
1027:3 October
742:Archive 2
739:Archive 1
489:Mil Mi-X1
362:-LHT-801
306:Data from
237:in 1986.
182:Honeywell
2580:Raider X
1882:aircraft
1880:Sikorsky
1818:Archived
1806:Archived
1669:Archived
1627:Archived
1552:Archived
1533:Archived
1469:Archived
1390:Sikorsky
1372:Archived
1293:cite web
1164:Archived
1055:Archived
1002:Sikorsky
992:Archived
927:Archived
896:Archived
864:Archived
820:Sikorsky
803:Archived
781:Archived
727:Archived
717:Archived
706:Archived
690:Archived
677:Archived
634:Sikorsky
625:Archived
590:1 August
584:Archived
425:See also
190:fairings
186:Moog Inc
2570:Firefly
2517:H-60J/K
2413:HH-3E/F
2258:S-61L/N
1777:YouTube
1760:in 2010
1758:YouTube
1731:YouTube
1530:Archive
1411:15 July
1407:. WIRED
1188:UTC.com
1132:Paywall
1072:Archive
658:29 July
289:by the
100:Retired
87:History
74:Retired
2595:XBLR-3
2575:Raider
2145:XBLR-3
2012:S-29-A
1052:Photos
954:
933:28 May
902:28 May
724:Page 3
714:Page 2
403:Range:
281:Awards
158:slowed
71:Status
2522:VH-60
2480:MH-53
2455:XH-39
2390:S-434
2385:S-333
2380:S-300
2375:S-103
2370:S-102
2365:S-100
2263:S-61R
2087:VS-44
1597:(PDF)
1321:p49,
999:video
323:Crew:
117:with
2600:XV-2
2585:SB-1
2435:H-18
2360:S-97
2355:S-95
2350:S-92
2345:S-80
2340:S-76
2335:S-75
2330:S-74
2325:S-73
2320:S-72
2315:S-71
2310:S-70
2305:S-69
2300:S-68
2295:S-67
2290:S-66
2285:S-65
2280:S-64
2275:S-63
2270:S-62
2253:S-61
2248:S-60
2243:S-59
2238:S-58
2233:S-57
2228:S-56
2223:S-55
2218:S-54
2213:S-53
2208:S-52
2203:S-51
2198:S-50
2193:S-49
2188:S-48
2183:S-47
2160:XV-2
2150:XPBS
2125:JR2S
2115:C-28
2092:S-45
2082:S-43
2077:S-42
2072:S-41
2067:S-40
2062:S-39
2057:S-38
2052:S-37
2047:S-36
2042:S-35
2037:S-34
2032:S-33
2027:S-32
2022:S-31
2017:S-30
2007:S-28
1997:S-21
1992:S-20
1987:S-19
1982:S-18
1977:S-17
1972:S-16
1967:S-15
1962:S-14
1957:S-13
1952:S-12
1947:S-11
1942:S-10
1737:and
1601:NASA
1506:2016
1477:2016
1413:2011
1343:NASA
1305:help
1285:2010
1258:2010
1029:2014
935:2015
904:2015
872:NASA
660:2010
611:IEEE
592:2017
561:2010
358:1 ×
251:Mach
109:The
44:Type
2549:HLH
2430:H-6
2425:H-5
2420:R-4
2155:XSS
2135:P2S
2120:JRS
2110:C-6
1937:S-9
1932:S-8
1927:S-7
1922:S-6
1917:S-5
1912:S-4
1907:S-3
1902:S-2
1897:S-1
1775:on
1756:on
1729:on
1577:",
1170:".
959:PDF
675:,
334:9.5
325:Two
297:).
273:in
2617::
2590:X2
2140:RS
2130:PS
1834:,
1661:"
1625:.
1621:.
1599:.
1558:"
1522:"
1496:.
1479:.
1467:.
1463:.
1451:^
1429:.
1387:"
1366:"
1351:^
1297::
1295:}}
1291:{{
1244:.
1226:.
1186:.
1146:.
1110:.
1044:"
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