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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
131:
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
197:
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.
224:
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.
239:, 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
37:) 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
340:
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.
247:
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
495:
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718:
41:
and low airspeeds, to improve handling and delay the stall. A dog tooth can also improve airflow and reduce drag at higher speeds.
89:, allowing the aircraft to fly at a higher angle of attack. Slats may be made fixed, or retractable in normal flight to minimize
81:
between the slat and wing which directs air over the wing surface, helping to maintain smooth airflow at low speeds and high
1112:
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877:
316:
The LEVCONs actuation ability also improves its performance over the LERX system in other areas. When combined with the
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120:
flow field to prevent separated flow from progressing outboard at high angle of attack. The effect is the same as a
210:
116:
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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258:"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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384:
Effects of Wing-Leading-Edge
Modifications on a Full-Scale, Low-Wing General Aviation Airplane
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164:, the dogtooth is created by adding an extension to the outer section of the leading edge.
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426:"Leading-edge Vortices Control on a Delta Wing by Micromachined Sensors and Actuators"
220:, 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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270:. The Su-27 LERX help make some advanced maneuvers possible, such as the
74:
156:. Where the dogtooth is added as an afterthought, as for example on the
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25:
Aircraft wing leading-edge extensions – annotated
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244:
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or during takeoff and landing, the LERX generates a high-speed
145:
117:
1186:
788:
640:
324:
is further increased, which assists in stunts which require
205:
298:
create lift augmenting leading edge vortices during high
431:. American Institute of Aeronautics and Astronautics
503:
305:This system has been incorporated in the Russian
292:
1438:
216:A leading-edge root extension (LERX) is a small
320:(TVC), the aircraft controllability at extreme
209:Condensation vortex flows along the LERX of an
452:"Sukhoi T-50 Shows Flight-Control Innovations"
200:
189:A leading edge cuff (or wing cuff) is a fixed
489:
176:Experimental drooped leading-edge cuff on an
124:. It can also be used on straight wings in a
262:has especially large examples, as does the
496:
482:
396:A Two-seat Gnat Development for the R.A.F.
336:the LEVCON system is used for increased
204:
171:
100:
48:
20:
902:
1439:
458:. Aviation Week & Space Technology
16:Anti-stall control surface on aircraft
477:
96:
449:
167:
44:
13:
14:
1473:
423:
410:Green, W. and Swanborough, G.;
1406:In-flight entertainment system
1103:Horizontal situation indicator
443:
417:
404:
389:
377:
293:Leading-edge vortex controller
193:device employed on fixed-wing
1:
412:The complete book of fighters
370:
178:American Aviation AA-1 Yankee
1386:Environmental control system
254:LERX were first used on the
7:
343:
318:thrust vectoring controller
231:, LERXes induce controlled
201:Leading-edge root extension
105:Dog tooth on the wing of a
10:
1478:
1063:Course deviation indicator
754:Electro-hydraulic actuator
350:Index of aviation articles
182:
62:
1353:
1332:
1294:Conventional landing gear
1265:
1161:
996:
862:
699:
515:
160:and some variants of the
1457:Aircraft wing components
1078:Flight management system
1381:Emergency oxygen system
1143:Turn and slip indicator
938:Leading-edge droop flap
908:Drag-reducing aerospike
883:Adaptive compliant wing
878:Active Aeroelastic Wing
332:. Additionally, on the
1421:Passenger service unit
1222:Self-sealing fuel tank
1118:Multi-function display
235:over the wing at high
213:
180:
109:
60:
31:leading-edge extension
26:
1452:Aircraft aerodynamics
1447:Aerospace engineering
1401:Ice protection system
1319:Tricycle landing gear
1309:Landing gear extender
526:Aft pressure bulkhead
268:CAC/PAC JF-17 Thunder
208:
175:
136:and the wings of the
104:
52:
24:
1462:Aircraft wing design
1366:Auxiliary power unit
774:Flight control modes
355:Canard (aeronautics)
338:departure-resistance
326:supermaneuverability
126:drooped leading edge
1345:Escape crew capsule
1252:War emergency power
1123:Pitot–static system
968:Variable-sweep wing
676:Vertical stabilizer
142:F/A-18 Super Hornet
1053:Attitude indicator
1033:Airspeed indicator
1028:Aircraft periscope
414:, Salamander, 1994
214:
181:
110:
97:Dogtooth extension
85:. This delays the
61:
54:Leading-edge slats
27:
1434:
1433:
1361:Aircraft lavatory
1098:Heading indicator
1043:Annunciator panel
1023:Air data computer
933:Leading-edge cuff
360:Strake (aviation)
185:Leading-edge cuff
168:Leading-edge cuff
79:leading edge slot
71:leading-edge slat
65:Leading-edge slat
45:Leading-edge slat
1469:
1416:Navigation light
1396:Hydraulic system
1371:Bleed air system
1299:Drogue parachute
973:Vortex generator
591:Interplane strut
498:
491:
484:
475:
474:
468:
467:
465:
463:
450:Sweetman, Bill.
447:
441:
440:
438:
436:
430:
421:
415:
408:
402:
393:
387:
381:
365:Vortex generator
330:Pugachev's Cobra
322:angles of attack
272:Pugachev's Cobra
237:angles of attack
229:fighter aircraft
83:angles of attack
39:angles of attack
1477:
1476:
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1471:
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1437:
1436:
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1430:
1426:Ram air turbine
1391:Flight recorder
1349:
1328:
1261:
1242:Thrust reversal
1166:
1157:
1128:Radar altimeter
1093:Head-up display
1003:
992:
888:Anti-shock body
870:
858:
719:Artificial feel
701:Flight controls
695:
561:Fabric covering
511:
507:components and
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300:angle of attack
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58:Airbus A318-100
56:deployed on an
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17:
12:
11:
5:
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1411:Landing lights
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1333:Escape systems
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1271:arresting gear
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1227:Splitter plate
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546:Cruciform tail
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541:Crack arrestor
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424:Lee, Gwo-Bin.
416:
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388:
386:, Nasa TP 2011
375:
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294:
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202:
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183:Main article:
169:
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154:Ilyushin Il-62
138:F-4 Phantom II
98:
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63:Main article:
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15:
9:
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1354:Other systems
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1340:Ejection seat
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1284:Arrestor hook
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1279:Aircraft tire
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1083:Glass cockpit
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1019:
1018:Air data boom
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799:Rudder pedals
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656:Trailing edge
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636:Stressed skin
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457:
456:Aviation Week
453:
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273:
269:
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261:
260:F/A-18 Hornet
257:
252:
250:
246:
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238:
234:
230:
225:
223:
219:
212:
207:
198:
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165:
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159:
158:Hawker Hunter
155:
151:
147:
143:
139:
135:
129:
128:arrangement.
127:
123:
119:
115:
108:
107:Hawker Hunter
103:
94:
92:
88:
84:
80:
76:
72:
66:
59:
55:
51:
42:
40:
36:
32:
23:
19:
1376:Deicing boot
1304:Landing gear
1247:Townend ring
1237:Thrust lever
1212:NACA cowling
1177:Autothrottle
1169:fuel systems
1167:devices and
958:Stall strips
942:
928:Krueger flap
898:Channel wing
844:Wing warping
834:Stick shaker
829:Stick pusher
749:Dual control
734:Centre stick
601:Leading edge
571:Flying wires
531:Cabane strut
460:. Retrieved
455:
445:
433:. Retrieved
419:
411:
406:
398:
391:
383:
379:
334:Sukhoi Su-57
315:
311:HAL LCA Navy
307:Sukhoi Su-57
304:
296:
284:
264:Sukhoi Su-27
256:Northrop F-5
253:
227:On a modern
226:
215:
188:
162:Quest Kodiak
150:F-8 Crusader
146:CF-105 Arrow
130:
113:
111:
68:
34:
30:
28:
18:
1324:Tundra tire
1207:Intake ramp
1138:Transponder
923:Gurney flap
864:Aerodynamic
779:Fly-by-wire
661:Triple tail
309:and Indian
191:aerodynamic
75:aerodynamic
1441:Categories
1314:Oleo strut
1202:Inlet cone
1197:Gascolator
1163:Propulsion
1153:Yaw string
1148:Variometer
1004:instrument
983:Wing fence
918:Gouge flap
893:Blown flap
849:Yaw damper
824:Stabilator
809:Side-stick
744:Dive brake
631:Stabilizer
606:Lift strut
596:Jury strut
462:18 October
435:18 October
371:References
276:Cobra Turn
152:, and the
134:F-15 Eagle
122:wing fence
1289:Autobrake
1217:NACA duct
1192:Fuel tank
1182:Drop tank
1165:controls,
1048:Astrodome
1038:Altimeter
903:Dog-tooth
868:high-lift
819:Spoileron
804:Servo tab
784:Gust lock
739:Deceleron
724:Autopilot
681:Wing root
666:Twin tail
651:Tailplane
586:Hardpoint
556:Empennage
519:structure
222:wing root
1257:Wet wing
1232:Throttle
978:Vortilon
839:Trim tab
769:Flaperon
759:Elevator
714:Airbrake
686:Wing tip
611:Longeron
581:Fuselage
517:Airframe
505:Aircraft
344:See also
328:such as
302:flight.
278:and the
266:and the
241:dogfight
195:aircraft
114:dogtooth
1267:Landing
1058:Compass
1006:systems
998:Avionic
988:Winglet
871:devices
814:Spoiler
709:Aileron
691:Wingbox
616:Nacelle
566:Fairing
509:systems
233:airflow
1002:flight
963:Strake
794:Rudder
764:Elevon
729:Canard
671:V-tail
646:T-tail
576:Former
536:Canopy
399:Flight
280:Kulbit
274:, the
245:vortex
218:fillet
211:F/A-18
118:vortex
73:is an
1187:FADEC
1073:EICAS
948:Slats
789:HOTAS
641:Strut
429:(PDF)
287:chine
249:stall
87:stall
1269:and
1133:TCAS
1113:ISIS
1068:EFIS
1013:ACAS
1000:and
953:Slot
913:Flap
866:and
854:Yoke
626:Spar
551:Dope
464:2018
437:2018
401:1959
91:drag
1108:INS
1088:GPS
943:LEX
621:Rib
35:LEX
1443::
454:.
313:.
289:.
282:.
148:,
144:,
140:,
112:A
93:.
69:A
29:A
497:e
490:t
483:v
466:.
439:.
33:(
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