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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
182:. 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,
146:, 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
169:
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.
193:. 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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154:. 765 were built by Schleicher and a further 140 were made under license by
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589:(2nd revised ed.). Königswinter: EQIP Werbung und Verlag G.m.b.H.
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Milgram, Fred Thomas; Judah; translator; contributor (1999).
543:(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.
632:
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
386:
150 L (40 US gal; 33 imp gal)
200:, and a second generation winglet designed by Prof.
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142:. Its fuselage is nearly identical to that of the
616:Johnson R, A Flight Test Evaluation of the ASW 20
514:. London: Jane's Information Group. p. 632.
368:root:Wortmann FX-63-131-K; tip:Wortmann FX-60-126
283:Open-class glider with PSR T01 turbojet sustainer
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576:CS1 maint: multiple names: authors list (
945:GRP construction - unspecified designer
512:Jane's All the World's Aircraft 1988-89
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311:Jane's All the World's Aircraft 1988–89
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7:
434:50 kg/m (10 lb/sq ft)
611:Alexander Schleicher GmbH & Co
332:6.82 m (22 ft 5 in)
140:Alexander Schleicher GmbH & Co
14:
350:10.5 m (113 sq ft)
344:1.45 m (4 ft 9 in)
541:Fundamentals of sailplane design
338:15 m (49 ft 3 in)
249:Prototype and initial production
241:Centrair-built ASW 20 FP in 1980
24:
1613:Designations carried over from
178:The ASW 20 is constructed from
510:John W.R. Taylor, ed. (1988).
1:
289:ASW20A produced in France by
1660:Aircraft first flown in 1977
1615:American designation systems
380:525 kg (1,157 lb)
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485:www.sailplanedirectory.com
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622:Sailplane Directory ASW20
374:260 kg (573 lb)
23:
676:Wooden construction pre-
303:Specifications (ASW 20B)
180:glass-reinforced plastic
1635:1970s German sailplanes
1416:Search & rescue (S)
585:Simons, Martin (2005).
317:General characteristics
627:ASW 20 B Flight Manual
481:"Alexander Schleicher"
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212:Flight characteristics
206:Penn State University
1006:aircraft designations
715:Wooden construction (
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587:Sailplanes 1965-2000
420:Maximum glide ratio:
1640:Schleicher aircraft
1004:Brazilian Air Force
618:, Soaring, May 1978
470:ASW20 flying notes.
378:Max takeoff weight:
33:General information
1655:High-wing aircraft
1390:Reconnaissance (R)
920:GRP construction (
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800:GRP construction (
741:Ka 4 Rhönlerche II
569:has generic name (
406:Never exceed speed
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596:978-3-9808838-1-8
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491:on 27 July 2013
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450:List of gliders
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167:Karl Striedieck
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73:(under licence)
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53:National origin
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399:Stall speed:
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355:Aspect ratio
353:
347:
341:
335:
329:
323:
316:
314:
310:
307:
306:
227:
223:
195:
188:
184:
177:
174:Construction
163:Dick Johnson
160:
134:designed by
121:
119:
111:First flight
90:Number built
62:Manufacturer
46:Sports Class
1505:Utility (U)
1432:Trainer (T)
1269:Liaison (L)
1185:Fighter (F)
706:Rhönbussard
392:Performance
198:Peter Masak
158:in France.
1629:Categories
1571:Glider (Z)
1359:Patrol (P)
1012:Attack (A)
668:Schleicher
495:12 January
456:References
416:+5.3 -2.65
348:Wing area:
67:Schleicher
1090:C-35 (II)
1043:Cargo (C)
701:Rhönadler
559:cite book
414:g limits:
336:Wingspan:
308:Data from
48:sailplane
1085:C-35 (I)
439:See also
291:Centrair
280:ASW20CLT
233:Variants
191:Centrair
156:Centrair
148:winglets
78:Designer
71:Centrair
42:15 metre
670:gliders
364:Airfoil
342:Height:
330:Length:
295:ASW20FP
274:ASW20CL
263:ASW20BL
208:(USA).
98:History
56:Germany
1217:F-2000
936:ASG 32
931:ASG 29
911:ASH 31
906:ASH 30
901:ASH 26
896:ASH 25
876:ASW 28
871:ASW 27
866:ASW 24
861:ASW 22
856:ASW 20
851:ASW 19
846:ASW 17
841:ASW 15
836:ASW 12
816:ASK 23
811:ASK 21
791:ASK 18
786:ASK 16
781:ASK 14
776:ASK 13
686:Condor
593:
547:
518:
286:ASW20F
269:ASW20C
258:ASW20B
252:ASW20L
152:ASW 27
144:ASW 19
132:glider
124:is an
122:ASW 20
19:ASW 20
1248:VH-34
1212:F-103
1160:C-115
1155:C-105
962:AS 35
957:AS 34
952:AS 33
756:K7/13
324:Crew:
246:ASW20
1603:Z-23
1598:Z-20
1593:Z-16
1588:Z-15
1583:Z-13
1562:U-93
1557:U-55
1552:U-45
1547:U-42
1542:U-37
1537:U-35
1532:U-19
1496:T-29
1491:T-27
1486:T-26
1481:T-25
1476:T-24
1464:T-23
1459:T-22
1454:T-21
1449:T-17
1423:S-16
1407:R-99
1402:R-95
1397:R-35
1381:P-99
1376:P-95
1371:P-16
1366:P-15
1329:M-16
1313:L-42
1308:L-20
1296:L-19
1260:H-55
1255:H-50
1243:H-34
1238:H-33
1207:F-39
1202:F-33
1176:E-99
1150:C-99
1145:C-98
1140:C-97
1135:C-96
1130:C-95
1125:C-93
1120:C-92
1115:C-91
1110:C-90
1105:C-55
1100:C-42
1095:C-41
1080:C-28
1075:C-26
1070:C-10
1034:A-29
1029:A-16
1024:A-10
771:K 10
766:Ka-9
736:Ka 3
591:ISBN
578:link
571:help
545:ISBN
516:ISBN
497:2022
359:21.4
120:The
114:1977
106:1977
38:Type
1578:Z-3
1527:U-9
1522:U-8
1517:U-7
1512:U-3
1444:T-8
1439:T-7
1350:O-6
1345:O-3
1301:A/E
1291:L-8
1286:L-7
1281:L-6
1276:L-3
1233:H-4
1197:F-8
1192:F-7
1065:C-9
1060:C-8
1055:C-2
1050:C-1
1019:A-1
761:K 8
204:of
126:FAI
93:905
44:or
1631::
751:K7
563::
561:}}
557:{{
483:.
1469:B
996:e
989:t
982:v
924:)
889:)
829:)
804:)
719:)
660:e
653:t
646:v
599:.
580:)
573:)
553:.
524:.
499:.
408::
366::
357::
326:1
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