26:
123:
The IS-4 was built for aerobatics with a high structural strength and a very high maximum speed which could not be achieved in a vertical dive. Due to the pilot's sitting position and the arrangements of the controls, it was difficult for pilots to exceed the 8g loading limit. During high speed
418:(in English, French, and German) (1st ed.). Zurich: Organisation Scientifique et Technique Internationale du Vol a Voile (OSTIV) and Schweizer Aero-Revue. pp. 172–173.
386:(in English, French, and German) (1st ed.). Zurich: Organisation Scientifique et Technique Internationale du Vol a Voile (OSTIV) and Schweizer Aero-Revue. pp. 172–173.
124:
flight it was possible for the air-brakes to be sucked out violently, so most pilots ensured that they remained closed by holding the airbrake control.
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The World's
Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II
384:
The World's
Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II
154:
The World's
Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II
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450:
https://web.archive.org/web/20100501051452/http://kionastore.com/plan-1530.html
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111:– gliding institute) was a single-seat aerobatic glider designed and built in
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1.04 m/s (205 ft/min) at 70 km/h (43 mph; 38 kn)
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205:
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51:
142:– Thirty-five production aircraft, three of which were exported.
463:
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321:
Aircraft of comparable role, configuration, and era
293:+7 -4 at 200 km/h (120 mph; 110 kn)
299:20.2 at 87 km/h (54 mph; 47 kn)
475:
8:
186:1.3 m (4 ft 3 in) at cockpit
482:
468:
460:
455:http://www.vintagesailplanes.de/szd__4.htm
268:450 km/h (280 mph, 240 kn)
281:200 km/h (120 mph; 110 kn)
275:200 km/h (120 mph; 110 kn)
553:/ PZL Bielsko-Biała / Allstar PZL Glider
414:Shenstone, B.S.; K.G. Wilkinson (1963).
382:Shenstone, B.S.; K.G. Wilkinson (1963).
340:
311:29.7 kg/m (6.1 lb/sq ft)
287:150 km/h (93 mph; 81 kn)
445:http://www.piotrp.de/SZYBOWCE/pis4.htm
354:
352:
350:
348:
346:
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259:67 km/h (42 mph, 36 kn)
15:
434:. Studio Editions: London. p. 29
7:
174:6.25 m (20 ft 6 in)
147:Specifications (IS-4 Jastrząb bis)
14:
180:12 m (39 ft 4 in)
24:
550:Szybowcowy Zakład Doświadczalny
432:Jane's Encyclopedia of Aviation
401:. Piotr & Renate Piechowski
363:. Piotr & Renate Piechowski
192:12 m (130 sq ft)
136:– two prototypes built in 1949.
1:
906:Aircraft first flown in 1949
922:
430:Taylor, J. H. (ed) (1989)
880:PZL Krosno KR-03 Puchatek
848:Margański & Mysłowski
244:357 kg (787 lb)
238:240 kg (529 lb)
23:
18:
490:Polish post-1945 gliders
901:1940s Polish sailplanes
810:Politechnika Warszawska
159:General characteristics
497:Instytut Szybownictwa
109:Instytut Szybownictwa
62:Instytut Szybownictwa
297:Maximum glide ratio:
273:Rough air speed max:
397:Piechowski, Piotr.
359:Piechowski, Piotr.
285:Winch launch speed:
264:Never exceed speed
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140:IS-4 Jastrząb bis
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40:Type of aircraft
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425:Further reading
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399:"IS-4 Jastrząb"
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361:"IS-4 Jastrząb"
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47:National origin
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439:External links
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279:Aerotow speed:
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19:IS-4 Jastrząb
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309:Wing loading:
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303:Rate of sink:
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242:Gross weight:
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134:IS-4 Jastrząb
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105:IS-4 Jastrząb
96:
91:
90:
86:
84:Introduction
83:
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78:
76:First flight
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58:Manufacturer
57:
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431:
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403:. Retrieved
383:
377:
365:. Retrieved
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308:
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284:
278:
272:
262:
257:Stall speed:
256:
249:
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210:
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197:Aspect ratio
195:
189:
183:
177:
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150:
139:
133:
122:
108:
104:
102:
93:Number built
79:21 Dec 1949
327:Vogt Lo 100
250:Performance
119:Development
115:from 1949.
895:Categories
335:References
190:Wing area:
71:J Niespał
861:Swift S-1
856:MDM-1 Fox
291:g limits:
231:NACA 0012
223:NACA 2412
215:NACA 2418
178:Wingspan:
152:Data from
68:Designer
405:19 April
367:19 April
316:See also
128:Variants
206:Airfoil
184:Height:
172:Length:
873:Krosno
800:SZD-59
795:SZD-56
790:SZD-55
785:SZD-54
780:SZD-52
775:SZD-51
770:SZD-50
765:SZD-49
760:SZD-48
755:SZD-45
750:SZD-43
745:SZD-42
740:SZD-41
735:SZD-40
730:SZD-39
725:SZD-38
720:SZD-37
715:SZD-36
710:SZD-35
705:SZD-34
700:SZD-33
695:SZD-32
690:SZD-31
685:SZD-30
680:SZD-29
675:SZD-28
670:SZD-27
665:SZD-26
660:SZD-25
655:SZD-24
650:SZD-23
645:SZD-22
640:SZD-21
635:SZD-20
630:SZD-19
625:SZD-18
620:SZD-17
615:SZD-16
610:SZD-15
605:SZD-14
600:SZD-13
595:SZD-12
590:SZD-11
585:SZD-10
113:Poland
52:Poland
37:Glider
580:SZD-9
575:SZD-8
570:SZD-7
565:SZD-6
560:SZD-C
166:Crew:
87:1950
33:Role
838:PW-6
833:PW-5
828:PW-4
823:PW-3
818:PW-2
540:IS-C
535:IS-B
530:IS-A
525:IS-5
520:IS-4
515:IS-3
510:IS-2
505:IS-1
407:2013
369:2013
211:Root
103:The
871:PZL
227:Mid
219:Tip
97:37
897::
343:^
229:–
225:,
221:–
217:,
213:–
201:12
483:e
476:t
469:v
409:.
371:.
266::
208::
199::
168:1
107:(
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