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low to mid speeds. Thermal performance is comparable to gliders of more modern eras. These characteristics have made the ASW-20 a much beloved and desirable aircraft, even after it was no longer competitive in racing. One very common modification was the insertion of an intermediate flap setting detent (between zero and +1 position) which mitigated or softened any "tip-stall" and associated risk of spinning while thermaling in tight, gusty thermals. The flexible wing of the A and C models is particularly favored for ridge running, where it absorbs some of the tremendous turbulence found at ridgetop.
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thrust force as the wings flexed back downward to their normal position. This concept is known as the
Katzmayr Effect, and somewhat mimics a bird's ability to use a flapping motion to propel itself forward in flight. This unique wing twisting movement gave the ASW-20 an ability to make very small but consistent performance gains (or reduced losses) in turbulent and gusty thermal conditions compared to other competition level sailplanes.
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The landing flaps (55° in early models, 38° in later models), in conjunction with very effective airbrakes, allow the pilot to make exceptionally steep approaches at slow speeds, permitting very short landings when required. Second generation winglets further improved the handling and reduced drag at
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The ASW-20 is known as a very pleasant handling glider in most respects. The wing structure composite layup was designed to twist slightly as the wings flexed upward, resulting in the ability to "store" some of the energy from atmospheric gusts, and then release that energy with a very slight forward
193:. It features trailing edge flaps which interconnect with the ailerons and allow the entire trailing edge to operate as a flap between -9 and +5 degrees. The flaps also act as ailerons, but deflect only half of the aileron amount. Schempp-Hirth type airbrakes are provided on the upper wing surface.
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hydraulic disc brake, and automatic elevator hookup. The B and C wings also incorporate a pneumatic turbulator system, which draws high pressure air from pitot inlets on the wing and injects it through approximately 860 pinholes into the boundary layer to control underwing airflow separation.
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The B model (introduced in 1983) differs from the A and C model in that it uses a reinforced wing spar, which provides an increased water ballast capacity at the expense of the flexible wing. The B and C model include several enhancements over the original A model, including a lifting panel,
157:, mated to newly designed flapped wings for the 15 metre Class. The prototype first flew in 1977. It proved to be a highly successful glider, winning several World Championships, and was still being flown at this level up to 1995. Developments along its production life included
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and John
Seymour won jointly, with others, the world triangle distance record of 1,435 km (892 mi) in 1994 in an ASW 20B. ASW 20s won second and third places in the 15 metre Class at the 1983 World Championships at Hobbs, New Mexico.
204:. Centrair also produced an FL variant equivalent to the German ASW20L; most of these are only permitted to fly without the wingtip extensions due to a deficiency in the wing spar construction.
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ASW 20s that include a L designation may be fitted with a 1.59 m wingtip extension. The F designation was assigned to A variants produced in France by
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At least three different winglet designs have been produced for the ASW 20, including a NASA winglet fitted to the
Centrair gliders (FP), a design by
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42.5 at 100 km/h (54 kn; 62 mph) (without ballast); 43 at 120 km/h (65 kn; 75 mph) (with ballast)
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the ASW20C with detachable outer wing extensions to 16.59 m (54.4 ft) span, to compete in the Open-class.
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the ASW20B with detachable outer wing extensions to 16.59 m (54.4 ft) span, to compete in the Open-class.
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the ASW20 with detachable outer wing extensions to 16.59 m (54.4 ft) span, to compete in the Open-class.
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reported that the ASW 20 was the first 15 m glider to demonstrate a measured L/D in excess of 40:1. Roy McMaster,
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The ASW 20 was successful in competition, winning numerous world and national championships.
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0.59 m/s (116 ft/min) at 84 km/h (45 kn; 52 mph) (without ballast)
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The ASW20F with NASA winglets designed to improve performance in weak conditions.
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165:. 765 were built by Schleicher and a further 140 were made under license by
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600:(2nd revised ed.). Königswinter: EQIP Werbung und Verlag G.m.b.H.
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Milgram, Fred Thomas; Judah; translator; contributor (1999).
554:(3rd ed.). College Park, Maryland: College Park Press.
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65 km/h (40 mph, 35 kn) (without ballast)
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are not included unless the designations were modified.
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History and developmen of the ASW20, Dan Rihn, 9/4/2010
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280 km/h (170 mph, 150 kn) in smooth air
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150 L (40 US gal; 33 imp gal)
211:, and a second generation winglet designed by Prof.
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153:. Its fuselage is nearly identical to that of the
627:Johnson R, A Flight Test Evaluation of the ASW 20
525:. London: Jane's Information Group. p. 632.
379:root:Wortmann FX-63-131-K; tip:Wortmann FX-60-126
294:Open-class glider with PSR T01 turbojet sustainer
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523:Jane's All the World's Aircraft 1988-89
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322:Jane's All the World's Aircraft 1988–89
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445:50 kg/m (10 lb/sq ft)
622:Alexander Schleicher GmbH & Co
343:6.82 m (22 ft 5 in)
151:Alexander Schleicher GmbH & Co
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361:10.5 m (113 sq ft)
355:1.45 m (4 ft 9 in)
552:Fundamentals of sailplane design
349:15 m (49 ft 3 in)
260:Prototype and initial production
252:Centrair-built ASW 20 FP in 1980
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1624:Designations carried over from
189:The ASW 20 is constructed from
521:John W.R. Taylor, ed. (1988).
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300:ASW20A produced in France by
1671:Aircraft first flown in 1977
1626:American designation systems
391:525 kg (1,157 lb)
18:Alexander Schleicher ASW 20
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496:www.sailplanedirectory.com
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633:Sailplane Directory ASW20
385:260 kg (573 lb)
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687:Wooden construction pre-
314:Specifications (ASW 20B)
191:glass-reinforced plastic
1646:1970s German sailplanes
1427:Search & rescue (S)
596:Simons, Martin (2005).
328:General characteristics
638:ASW 20 B Flight Manual
492:"Alexander Schleicher"
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223:Flight characteristics
217:Penn State University
1017:aircraft designations
726:Wooden construction (
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598:Sailplanes 1965-2000
431:Maximum glide ratio:
1651:Schleicher aircraft
1015:Brazilian Air Force
629:, Soaring, May 1978
481:ASW20 flying notes.
389:Max takeoff weight:
44:General information
1666:High-wing aircraft
1401:Reconnaissance (R)
931:GRP construction (
896:GRP construction (
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580:has generic name (
417:Never exceed speed
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607:978-3-9808838-1-8
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114:Introduction date
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502:on 27 July 2013
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461:List of gliders
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178:Karl Striedieck
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424:
415:
410:Stall speed:
409:
402:
400:
394:
388:
382:
373:
366:Aspect ratio
364:
358:
352:
346:
340:
334:
327:
325:
321:
318:
317:
238:
234:
206:
199:
195:
188:
185:Construction
174:Dick Johnson
171:
145:designed by
132:
130:
122:First flight
101:Number built
73:Manufacturer
57:Sports Class
1516:Utility (U)
1443:Trainer (T)
1280:Liaison (L)
1196:Fighter (F)
717:Rhönbussard
403:Performance
209:Peter Masak
169:in France.
1640:Categories
1582:Glider (Z)
1370:Patrol (P)
1023:Attack (A)
679:Schleicher
506:12 January
467:References
427:+5.3 -2.65
359:Wing area:
78:Schleicher
1101:C-35 (II)
1054:Cargo (C)
712:Rhönadler
570:cite book
425:g limits:
347:Wingspan:
319:Data from
59:sailplane
1096:C-35 (I)
450:See also
302:Centrair
291:ASW20CLT
244:Variants
202:Centrair
167:Centrair
159:winglets
89:Designer
82:Centrair
53:15 metre
681:gliders
375:Airfoil
353:Height:
341:Length:
306:ASW20FP
285:ASW20CL
274:ASW20BL
219:(USA).
109:History
67:Germany
1228:F-2000
947:ASG 32
942:ASG 29
922:ASH 31
917:ASH 30
912:ASH 26
907:ASH 25
887:ASW 28
882:ASW 27
877:ASW 24
872:ASW 22
867:ASW 20
862:ASW 19
857:ASW 17
852:ASW 15
847:ASW 12
827:ASK 23
822:ASK 21
802:ASK 18
797:ASK 16
792:ASK 14
787:ASK 13
697:Condor
604:
558:
529:
297:ASW20F
280:ASW20C
269:ASW20B
263:ASW20L
163:ASW 27
155:ASW 19
143:glider
135:is an
133:ASW 20
30:ASW 20
1259:VH-34
1223:F-103
1171:C-115
1166:C-105
973:AS 35
968:AS 34
963:AS 33
767:K7/13
335:Crew:
257:ASW20
1614:Z-23
1609:Z-20
1604:Z-16
1599:Z-15
1594:Z-13
1573:U-93
1568:U-55
1563:U-45
1558:U-42
1553:U-37
1548:U-35
1543:U-19
1507:T-29
1502:T-27
1497:T-26
1492:T-25
1487:T-24
1475:T-23
1470:T-22
1465:T-21
1460:T-17
1434:S-16
1418:R-99
1413:R-95
1408:R-35
1392:P-99
1387:P-95
1382:P-16
1377:P-15
1340:M-16
1324:L-42
1319:L-20
1307:L-19
1271:H-55
1266:H-50
1254:H-34
1249:H-33
1218:F-39
1213:F-33
1187:E-99
1161:C-99
1156:C-98
1151:C-97
1146:C-96
1141:C-95
1136:C-93
1131:C-92
1126:C-91
1121:C-90
1116:C-55
1111:C-42
1106:C-41
1091:C-28
1086:C-26
1081:C-10
1045:A-29
1040:A-16
1035:A-10
782:K 10
777:Ka-9
747:Ka 3
602:ISBN
589:link
582:help
556:ISBN
527:ISBN
508:2022
370:21.4
131:The
125:1977
117:1977
49:Type
1589:Z-3
1538:U-9
1533:U-8
1528:U-7
1523:U-3
1455:T-8
1450:T-7
1361:O-6
1356:O-3
1312:A/E
1302:L-8
1297:L-7
1292:L-6
1287:L-3
1244:H-4
1208:F-8
1203:F-7
1076:C-9
1071:C-8
1066:C-2
1061:C-1
1030:A-1
772:K 8
215:of
137:FAI
104:905
55:or
1642::
762:K7
574::
572:}}
568:{{
494:.
1480:B
1007:e
1000:t
993:v
935:)
900:)
840:)
815:)
730:)
671:e
664:t
657:v
610:.
591:)
584:)
564:.
535:.
510:.
419::
377::
368::
337:1
20:)
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