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Leading-edge vortex controller (LEVCON) systems are a continuation of leading-edge root extension (LERX) technology, but with actuation that allows the leading edge vortices to be modified without adjusting the aircraft's attitude. Otherwise they operate on the same principles as the LERX system to
142:
Many high-performance aircraft use the dogtooth design, which induces a vortex over the wing to control boundary layer spanwise extension, increasing lift and improving resistance to stall. Some of the best-known uses of the dogtooth are in the stabilizer of the
208:
to introduce a sharp discontinuity in the leading edge of the wing in the same way as a dogtooth. It also typically has a slightly drooped leading edge to improve low-speed characteristics.
235:
to a point along the fuselage. These are often called simply leading-edge extensions (LEX), although they are not the only kind. To avoid ambiguity, this article uses the term LERX.
250:, so delaying the stall and consequent loss of lift. In cruising flight, the effect of the LERX is minimal. However, at high angles of attack, as often encountered in a
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48:) is a small extension to an aircraft wing surface, forward of the leading edge. The primary reason for adding an extension is to improve the airflow at high
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in the event of TVC failure at a post-stall attitude. It can also be used for trimming the aircraft, and optimizing the lift to drag ratio during cruise.
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that attaches to the top of the wing. The vortex action maintains the attachment of the airflow to the upper-wing surface well past the normal
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and low airspeeds, to improve handling and delay the stall. A dog tooth can also improve airflow and reduce drag at higher speeds.
100:, allowing the aircraft to fly at a higher angle of attack. Slats may be made fixed, or retractable in normal flight to minimize
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between the slat and wing which directs air over the wing surface, helping to maintain smooth airflow at low speeds and high
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The LEVCONs actuation ability also improves its performance over the LERX system in other areas. When combined with the
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flow field to prevent separated flow from progressing outboard at high angle of attack. The effect is the same as a
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is a small, sharp zig-zag break in the leading edge of a wing. It is usually used on a swept wing, to generate a
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point at which the airflow separates from the wing surface, thus sustaining lift at very high angles.
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269:"Freedom Fighter" which flew in 1959, and have since become commonplace on many combat aircraft. The
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A long, narrow sideways extension to the fuselage, attached in this position, is an example of a
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Effects of Wing-Leading-Edge
Modifications on a Full-Scale, Low-Wing General Aviation Airplane
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175:, the dogtooth is created by adding an extension to the outer section of the leading edge.
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437:"Leading-edge Vortices Control on a Delta Wing by Micromachined Sensors and Actuators"
231:, typically roughly triangular in shape, running forward from the leading edge of the
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surface running spanwise just ahead of the wing leading edge. It creates a
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281:. The Su-27 LERX help make some advanced maneuvers possible, such as the
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167:. Where the dogtooth is added as an afterthought, as for example on the
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36:
Aircraft wing leading-edge extensions – annotated
488:
254:
or during takeoff and landing, the LERX generates a high-speed
335:
is further increased, which assists in stunts which require
309:
create lift augmenting leading edge vortices during high
442:. American Institute of Aeronautics and Astronautics
1364:
1343:
1276:
1172:
1007:
873:
710:
526:
316:This system has been incorporated in the Russian
227:A leading-edge root extension (LERX) is a small
331:(TVC), the aircraft controllability at extreme
220:Condensation vortex flows along the LERX of an
463:"Sukhoi T-50 Shows Flight-Control Innovations"
200:A leading edge cuff (or wing cuff) is a fixed
500:
187:Experimental drooped leading-edge cuff on an
135:. It can also be used on straight wings in a
8:
273:has especially large examples, as does the
507:
493:
485:
407:A Two-seat Gnat Development for the R.A.F.
347:the LEVCON system is used for increased
31:
913:
387:
469:. Aviation Week & Space Technology
27:Anti-stall control surface on aircraft
7:
25:
421:Green, W. and Swanborough, G.;
1417:In-flight entertainment system
1114:Horizontal situation indicator
304:Leading-edge vortex controller
204:device employed on fixed-wing
1:
423:The complete book of fighters
189:American Aviation AA-1 Yankee
1397:Environmental control system
265:LERX were first used on the
329:thrust vectoring controller
242:, LERXes induce controlled
212:Leading-edge root extension
116:Dog tooth on the wing of a
1489:
1074:Course deviation indicator
765:Electro-hydraulic actuator
361:Index of aviation articles
193:
73:
1305:Conventional landing gear
171:and some variants of the
1468:Aircraft wing components
1089:Flight management system
1392:Emergency oxygen system
1154:Turn and slip indicator
949:Leading-edge droop flap
919:Drag-reducing aerospike
894:Adaptive compliant wing
889:Active Aeroelastic Wing
343:. Additionally, on the
1432:Passenger service unit
1233:Self-sealing fuel tank
1129:Multi-function display
246:over the wing at high
224:
191:
120:
71:
42:leading-edge extension
37:
18:Leading edge extension
1463:Aircraft aerodynamics
1458:Aerospace engineering
1412:Ice protection system
1330:Tricycle landing gear
1320:Landing gear extender
537:Aft pressure bulkhead
279:CAC/PAC JF-17 Thunder
219:
186:
147:and the wings of the
115:
63:
35:
1473:Aircraft wing design
1377:Auxiliary power unit
785:Flight control modes
366:Canard (aeronautics)
349:departure-resistance
337:supermaneuverability
137:drooped leading edge
1356:Escape crew capsule
1263:War emergency power
1134:Pitot–static system
979:Variable-sweep wing
687:Vertical stabilizer
153:F/A-18 Super Hornet
1064:Attitude indicator
1044:Airspeed indicator
1039:Aircraft periscope
425:, Salamander, 1994
225:
192:
121:
108:Dogtooth extension
96:. This delays the
72:
65:Leading-edge slats
38:
1445:
1444:
1372:Aircraft lavatory
1109:Heading indicator
1054:Annunciator panel
1034:Air data computer
944:Leading-edge cuff
371:Strake (aviation)
196:Leading-edge cuff
179:Leading-edge cuff
90:leading edge slot
82:leading-edge slat
76:Leading-edge slat
56:Leading-edge slat
16:(Redirected from
1480:
1427:Navigation light
1407:Hydraulic system
1382:Bleed air system
1310:Drogue parachute
984:Vortex generator
602:Interplane strut
509:
502:
495:
486:
479:
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476:
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461:Sweetman, Bill.
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452:
451:
449:
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441:
432:
426:
419:
413:
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398:
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376:Vortex generator
341:Pugachev's Cobra
333:angles of attack
283:Pugachev's Cobra
248:angles of attack
240:fighter aircraft
94:angles of attack
50:angles of attack
21:
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1437:Ram air turbine
1402:Flight recorder
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1272:
1253:Thrust reversal
1177:
1168:
1139:Radar altimeter
1104:Head-up display
1014:
1003:
899:Anti-shock body
881:
869:
730:Artificial feel
712:Flight controls
706:
572:Fabric covering
522:
518:components and
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311:angle of attack
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69:Airbus A318-100
67:deployed on an
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1422:Landing lights
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1344:Escape systems
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1282:arresting gear
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557:Cruciform tail
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552:Crack arrestor
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435:Lee, Gwo-Bin.
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397:, Nasa TP 2011
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194:Main article:
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165:Ilyushin Il-62
149:F-4 Phantom II
109:
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74:Main article:
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26:
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14:
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1365:Other systems
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1351:Ejection seat
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1295:Arrestor hook
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1290:Aircraft tire
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1094:Glass cockpit
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1029:Air data boom
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810:Rudder pedals
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667:Trailing edge
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647:Stressed skin
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467:Aviation Week
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272:
271:F/A-18 Hornet
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170:
169:Hawker Hunter
166:
162:
158:
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150:
146:
140:
139:arrangement.
138:
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130:
126:
119:
118:Hawker Hunter
114:
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55:
53:
51:
47:
43:
34:
30:
19:
1387:Deicing boot
1315:Landing gear
1258:Townend ring
1248:Thrust lever
1223:NACA cowling
1188:Autothrottle
1180:fuel systems
1178:devices and
969:Stall strips
953:
939:Krueger flap
909:Channel wing
855:Wing warping
845:Stick shaker
840:Stick pusher
760:Dual control
745:Centre stick
612:Leading edge
582:Flying wires
542:Cabane strut
471:. Retrieved
466:
456:
444:. Retrieved
430:
422:
417:
409:
402:
394:
390:
345:Sukhoi Su-57
326:
322:HAL LCA Navy
318:Sukhoi Su-57
315:
307:
295:
275:Sukhoi Su-27
267:Northrop F-5
264:
238:On a modern
237:
226:
199:
173:Quest Kodiak
161:F-8 Crusader
157:CF-105 Arrow
141:
124:
122:
79:
45:
41:
39:
29:
1335:Tundra tire
1218:Intake ramp
1149:Transponder
934:Gurney flap
875:Aerodynamic
790:Fly-by-wire
672:Triple tail
320:and Indian
202:aerodynamic
86:aerodynamic
1452:Categories
1325:Oleo strut
1213:Inlet cone
1208:Gascolator
1174:Propulsion
1164:Yaw string
1159:Variometer
1015:instrument
994:Wing fence
929:Gouge flap
904:Blown flap
860:Yaw damper
835:Stabilator
820:Side-stick
755:Dive brake
642:Stabilizer
617:Lift strut
607:Jury strut
473:18 October
446:18 October
382:References
287:Cobra Turn
163:, and the
145:F-15 Eagle
133:wing fence
1300:Autobrake
1228:NACA duct
1203:Fuel tank
1193:Drop tank
1176:controls,
1059:Astrodome
1049:Altimeter
914:Dog-tooth
879:high-lift
830:Spoileron
815:Servo tab
795:Gust lock
750:Deceleron
735:Autopilot
692:Wing root
677:Twin tail
662:Tailplane
597:Hardpoint
567:Empennage
530:structure
233:wing root
1268:Wet wing
1243:Throttle
989:Vortilon
850:Trim tab
780:Flaperon
770:Elevator
725:Airbrake
697:Wing tip
622:Longeron
592:Fuselage
528:Airframe
516:Aircraft
355:See also
339:such as
313:flight.
289:and the
277:and the
252:dogfight
206:aircraft
125:dogtooth
1278:Landing
1069:Compass
1017:systems
1009:Avionic
999:Winglet
882:devices
825:Spoiler
720:Aileron
702:Wingbox
627:Nacelle
577:Fairing
520:systems
244:airflow
1013:flight
974:Strake
805:Rudder
775:Elevon
740:Canard
682:V-tail
657:T-tail
587:Former
547:Canopy
410:Flight
291:Kulbit
285:, the
256:vortex
229:fillet
222:F/A-18
129:vortex
84:is an
1198:FADEC
1084:EICAS
959:Slats
800:HOTAS
652:Strut
440:(PDF)
298:chine
260:stall
98:stall
1280:and
1144:TCAS
1124:ISIS
1079:EFIS
1024:ACAS
1011:and
964:Slot
924:Flap
877:and
865:Yoke
637:Spar
562:Dope
475:2018
448:2018
412:1959
102:drag
1119:INS
1099:GPS
954:LEX
632:Rib
46:LEX
1454::
465:.
324:.
300:.
293:.
159:,
155:,
151:,
123:A
104:.
80:A
40:A
508:e
501:t
494:v
477:.
450:.
44:(
20:)
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