230:), started in late 1936. The design was accepted by the Air Force Command in 1937 and two prototypes were ordered. In June 1938, 300 PZL Merkury VIII engines built under license in PZL WS-1 factory were ordered, with first to be delivered in June 1939. The engine for the prototype was imported from Great Britain and fitted in September 1938. The prototype was almost ready by October, but its completion was delayed by the lack of a retractable landing gear, delivered by the British
248:
only 420 to 430 km/h (260 to 270 mph). The
Mercury VIII engine had problems with delivering full power due to an unsuitable carburetor intake and, after modifications, the prototype was able to reach 442 km/h (275 mph). Test pilots continued to complain about power output being too low, although with a better engine, some observers estimated that a production example would have been able to top 470 km/h (290 mph)
197:/LWS-4. While potentially a suitable design, the PZL.38 had problems finding proper engines and the estimated performance of the PZL.39 was too low (maximum speed 400 km/h (250 mph)), resulting in both programs being canceled. Future wartime experience showed, that heavy fighters were not well matched against fast single-engine interceptors. It became evident that the Air Force needed a modern
26:
398:
304:
distinguished by having a cut down rear fuselage to accommodate an "all-round vision hood". The production series would have incorporated a different canopy and a ventral fuselage fairing. After the German invasion and outbreak of World War II, on 2–3 September 1939, two incomplete aircraft (pattern PZL.50 and PZL.50/II) were moved from the WP-1 factory in
331:, which also contains representative drawings of the aircraft. Only in 2005 were a couple of photographs discovered that showed two incomplete aircraft at Czerniakowska street. The photographs made by German soldiers and a Polish amateur photographer, made it possible to authentically reconstruct the PZL.50's design features.
216:
VIII (840 metric hp/825 imperial hp) radial engine as the project's powerplant. PZL had already manufactured
Mercury V engines and would be able to retool to build the later version, as a Polish-produced engine was one of primary considerations in the design. This choice however restricted
303:
By the end of August 1939, the first unarmed flying prototype PZL.50/I, the second incomplete and engine-less prototype PZL.50/II, an incomplete preliminary PZL.50. and parts of four PZL.50As were all that was completed. The first prototype had a short fairing behind the canopy, all the others were
286:
II or III for the Polish Air Force (estimated speed 530 to 560 km/h (330 to 350 mph)). The Gnome-Rhone engine was only delivered in August 1939, while the newest
British Taurus was scheduled to be delivered in October or November, but final deliveries were prevented by war. Nonetheless,
247:
and several other pilots who noted that the prototype, after modifications to the tail, exhibited satisfactory handling and maneuverability characteristics although it was not agile enough as an interceptor. The greatest concern was that even without radio and machine guns, it was able to achieve
234:
firm. Due to the delay, the Polish aviation authorities missed the chance of starting flying tests with some temporary fixed landing gear, since Polish industry had not yet produced suitable retractable gears. Avia-manufactured undercarriage units were specified for the production series.
322:
Because of the secrecy surrounding the aircraft, for over 65 years its existence was only partly known based on four photographs of fragments of the first prototype, made during a presentation to Ciano, two of which are shown in the book,
238:
Finally, the first prototype PZL.50/I was completed and flown in late
February 1939 by pilot Jerzy Widawski. Despite being officially classified as a secret, on 27 February it was on static display for the Italian Foreign Minister, Count
255:
estimated that the current PZL.50 design did not meet its specified performance goals and ordered PZL to develop it further, building an improved pattern aircraft with only a limited series of 25-30 aircraft on order, designated the
177:. However, by the end of decade they had become obsolete, as new fighter and bomber aircraft with higher performance started to appear. There was no development carried out on other fighters, apart from
212:
passenger airliner, and to start work on a modern single-engine fighter with retractable landing gear and a speed of some 500 km/h (310 mph). At the same time, Rayski selected the
British
260:. Production aircraft were to have the wing area increased from 15.8 m to 19 m. The total planned order was decreased to 200 and Poland started to look for fighters abroad, ordering 160
153:. Designed after 1936, its prototype first flew in February 1939. By September, the first production aircraft were nearing completion, but further development was interrupted by the
274:
The second prototype PZL.50/II was to be equipped with a more powerful 1,200-1,400 hp engine, but never was. Only in 1939, was the PZL.50/II reworked with a 1,100 hp
287:
Taurus development had proved to be troublesome. Other possible engine alternatives were the Polish PZL Waran engine, which was to be ready in spring 1940, the 1,000 hp
1863:
295:. As early as 1938, Jakimiuk proposed a variant with the 1,100 hp Hispano-Suiza 12Y inline engine, designated PZL.56 Kania, but it was not accepted.
1873:
645:
1858:
975:
1883:
251:
It was first planned to order 300 PZL.50s, but in April 1939, the new Air Force
Commander Gen. Kalkus and Air Defence Inspector Gen.
916:
894:
984:
205:
146:
61:
201:
to defend the country, and at last, in
October 1936, the Armament Committee (KSUS) submitted a demand for such an interceptor.
181:, which was an improved export variant of Puławski's P.11 design. By the mid-1930s, the Polish Air Force Command led by Gen.
149:. The single-seat low-wing monoplane was to serve as a multi-purpose fighter and escort to replace all other fighters in the
835:
1544:
1539:
217:
performance of the future fighter, and, according to historians, the whole program started at least two years too late.
308:
to Citroën plant at
Czerniakowska Street, where they were captured by the Germans, and possibly scrapped after 1940.
349:
Second prototype with fuselage changes (elongated fuselage, long canopy fairing) and with redesigned engine cowling.
1878:
1792:
1782:
968:
1564:
288:
1368:
378:
360:
1642:
1627:
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1383:
244:
1817:
1762:
1378:
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56:
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1807:
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142:
1282:
1157:
563:
118:
1597:
1498:
1241:
1236:
585:
480:
198:
744:
Cynk, Jerzy B. "PZL.50 Jastrząb w prawdziwej postaci ('The PZL.50 Jastrząb in an authentic shape')"
605:
174:
1508:
1812:
1802:
1358:
154:
1132:
374:
275:
1657:
1513:
1251:
912:
890:
878:
750:
590:
252:
185:
expected, that a basic Polish general-purpose fighter and light bomber would be a twin-engine
182:
1707:
1617:
1587:
1534:
1459:
1398:
1393:
1287:
1261:
1112:
635:
630:
410:
292:
208:'s Chief Designer Wsiewołod Jakimiuk, a lead designer of the P.11c, to abandon work on the
194:
150:
138:
79:
41:
1102:
620:
1837:
1832:
1787:
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1752:
1747:
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1434:
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1302:
1297:
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839:
356:
213:
1117:
1077:
1822:
1582:
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1403:
1353:
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1206:
1201:
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1142:
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370:
283:
240:
1852:
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1373:
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1216:
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1127:
1097:
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209:
186:
1732:
1722:
1712:
1702:
1672:
1662:
1652:
1632:
1602:
1439:
1226:
1172:
615:
600:
580:
568:
382:
122:
929:
Gruszczyński, Jerzy. "Jastrząb nie zdążył..." ('The Jastrząb hasn't made it...')
830:
1777:
1717:
1687:
1682:
1677:
1637:
1211:
1107:
231:
190:
165:
In early 1930s the Polish Air Force was equipped with the then state-of-the-art
1321:
1137:
1017:
328:
316:
25:
271:
fighters were ordered, fitting the P.11c airframe with
Mercury VIII engines.
1592:
1503:
1419:
1307:
1277:
949:
Photos and drawing of PZL.50A and 3-d drawing of the PZL.50/I at Ugolok neba
595:
539:
170:
948:
1529:
1493:
1488:
1363:
1082:
1057:
265:
178:
166:
282:(estimated maximum speed 560 km/h (350 mph)) or 1,060 hp
1827:
1343:
1231:
1052:
1047:
1042:
1037:
1012:
355:
Planned first production variant based on second prototype, powered by
312:
1697:
1692:
1292:
1167:
1122:
1092:
1087:
1072:
1067:
1062:
900:
Cynk, Jerzy B. "P.Z.L. P.50 Jastrząb (They didn't quite... No. 16)."
610:
483:
9-cylinder air-cooled radial piston engine, 615 kW (825 hp)
403:
173:
monoplanes, the latest of a family of fighter aircraft designed by
1032:
1027:
1022:
226:
957:
953:
872:
Cynk, Jerzy B. "Jastrząb ujawniony" ('The Jastrząb revealed')
926:(In Polish). Sandomierz, Poland: Wydawnictwo Stratus, 2008.
311:
The first prototype was flown east by Jan
Widawski towards
909:
Warplanes of the Second World War, Volume Three: Fighters
911:. London: Macdonald & Co.(Publishers) Ltd., 1961.
193:, supplemented by a light, cheap low-wing monoplane
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1557:
1522:
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1472:
1412:
1336:
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1194:
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1005:
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575:
Aircraft of comparable role, configuration, and era
114:
106:
98:
93:
85:
75:
67:
55:
47:
37:
32:
18:
264:fighters from France. As an interim measure, 100
969:
785:
783:
764:
762:
760:
731:
729:
377:engine (1,100 hp) and armed with 4 x 7.92 mm
8:
369:Planned second production series powered by
89:2 prototypes (+5 incomplete serial aircraft)
1474:WSK-Świdnik / WSK PZL-Świdnik / PZL-Świdnik
808:
806:
804:
359:engine (840 hp) and armed with 4 x 7.92 mm
1478:
1333:
1191:
1002:
976:
962:
954:
889:. London, UK: Putnam & Company, 1971.
15:
504:430 km/h (270 mph, 230 kn)
1576:/ PZL Bielsko-Biała / Allstar PZL Glider
689:
687:
712:
710:
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677:
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510:750 km (470 mi, 400 nmi)
315:on 6 September, but crash landed near
7:
1864:World War II Polish fighter aircraft
832:PZL.50 Jastrząb w prawdziwej postaci
904:, Volume 24, No. 12, December 1962.
243:. Tests were carried out mainly by
924:Polskie Konstrukcje Lotnicze Vol.3
548:100 kg (220 lb) of bombs
449:9.7 m (31 ft 10 in)
14:
538:4 x 7.92 mm (0.312 in)
489:3-bladed variable-pitch propeller
461:15.8 m (170 sq ft)
455:2.7 m (8 ft 10 in)
204:In late 1936, Rayski ordered the
396:
24:
1874:Single-engined tractor aircraft
1574:Szybowcowy Zakład Doświadczalny
522:12 m/s (2,400 ft/min)
443:8 m (26 ft 3 in)
937:, nr. 12/2005, pp. 46–53.
882:, nr. 11/2005, pp. 55–60.
646:Weiss Manfréd WM-23 Ezüst Nyíl
155:Nazi-Soviet Invasion of Poland
1:
1859:1930s Polish fighter aircraft
516:7,500 m (24,600 ft)
473:2,400 kg (5,291 lb)
467:1,900 kg (4,189 lb)
289:Pratt & Whitney Twin Wasp
1884:Aircraft first flown in 1939
1322:WSK-Mielec / WSK PZL-Mielec
1900:
997:Państwowe Zakłady Lotnicze
319:upon running out of fuel.
147:Państwowe Zakłady Lotnicze
137:) was a Polish late 1930s
62:Państwowe Zakłady Lotnicze
887:Polish Aircraft 1893-1939
417:Specifications (PZL.50/I)
325:Polish Aircraft 1893-1939
23:
1328:Polskie Zakłady Lotnicze
821:Cynk 1971, pp. 259–265.
151:Polish Military Aviation
777:Cynk 1962, pp. 387–388.
428:General characteristics
718:Jastrząb nie zdążył...
278:for an export variant
262:Morane-Saulnier MS 406
161:Design and development
1188:/ PZL Warszawa-Okęcie
716:Gruszczyński, Jerzy.
383:nkm FK wz.38D cannons
379:km wz.36 machine guns
361:km wz.36 machine guns
71:Never entered service
754:, nr. 6/2005, p. 59.
586:Brewster F2A Buffalo
385:and 300 kg of bombs.
363:and 100 kg of bombs.
199:interceptor aircraft
859:Glass 2008, p. 133.
850:Glass 2008, p. 131.
812:Green 1961, p. 121.
798:Glass 2008, p. 130.
606:Grumman F4F Wildcat
558:Related development
390:Operators (planned)
299:Operational history
33:General information
1158:PZL.53 Jastrząb II
838:2007-02-04 at the
789:Cynk 1962, p. 388.
768:Cynk 1962, p. 387.
735:Cynk 1962, p. 386.
695:Jastrząb ujawniony
564:PZL.53 Jastrząb II
143:Wsiewołod Jakimiuk
119:PZL.53 Jastrząb II
1879:Low-wing aircraft
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1845:
1553:
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1467:
1316:
1315:
1186:CSS / WSK-Okęcie
1181:
1180:
879:Skrzydlata Polska
751:Skrzydlata Polska
591:Curtiss P-36 Hawk
375:Gnome-Rhône 14N21
371:Bristol Taurus II
291:or 1,375 hp
276:Gnome-Rhône 14N21
245:Bolesław Orliński
128:
127:
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1479:
1334:
1262:PZL-230 Skorpion
1192:
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993:PZL - up to 1939
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907:Green, William.
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631:Polikarpov I-180
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514:Service ceiling:
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481:PZL Merkury VIII
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411:Polish Air Force
402:
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357:PZL Merkury VIII
343:First prototype.
293:Bristol Hercules
224:named Jastrząb (
175:Zygmunt Puławski
139:fighter aircraft
80:Polish Air Force
42:Fighter aircraft
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1242:PZL-111 Koliber
1237:PZL-110 Koliber
1222:PZL-105 Flaming
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1153:PZL.50 Jastrząb
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214:Bristol Mercury
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131:PZL.50 Jastrząb
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48:National origin
19:PZL.50 Jastrząb
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1247:PZL-112 Junior
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1207:PZL-101 Gawron
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1423:
1421:
1418:
1417:
1415:
1411:
1405:
1402:
1400:
1397:
1395:
1392:
1390:
1387:
1385:
1382:
1380:
1377:
1375:
1372:
1370:
1367:
1365:
1362:
1360:
1357:
1355:
1352:
1350:
1347:
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1335:
1332:
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1325:
1319:
1309:
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1299:
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1286:
1284:
1281:
1279:
1276:
1275:
1273:
1269:
1263:
1260:
1258:
1257:PZL-130 Orlik
1255:
1253:
1250:
1248:
1245:
1243:
1240:
1238:
1235:
1233:
1230:
1228:
1225:
1223:
1220:
1218:
1217:PZL-104 Wilga
1215:
1213:
1210:
1208:
1205:
1203:
1200:
1199:
1197:
1193:
1190:
1184:
1174:
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1154:
1151:
1149:
1146:
1144:
1141:
1139:
1136:
1134:
1131:
1129:
1128:PZL.44 Wicher
1126:
1124:
1121:
1119:
1116:
1114:
1111:
1109:
1106:
1104:
1101:
1099:
1096:
1094:
1091:
1089:
1086:
1084:
1081:
1079:
1076:
1074:
1071:
1069:
1066:
1064:
1061:
1059:
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1036:
1034:
1031:
1029:
1026:
1024:
1021:
1019:
1016:
1014:
1011:
1010:
1008:
1004:
1001:
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991:
986:
979:
974:
972:
967:
965:
960:
959:
956:
950:
947:
946:
942:
936:
928:
925:
921:
918:
917:0-356-01447-9
914:
910:
906:
903:
902:Air Pictorial
899:
896:
895:0-370-00085-4
892:
888:
884:
881:
880:
871:
870:
865:
864:
856:
853:
847:
844:
841:
837:
834:
833:
827:
824:
818:
815:
809:
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795:
792:
786:
784:
780:
774:
771:
765:
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761:
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741:
738:
732:
730:
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719:
713:
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696:
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678:
676:
674:
672:
670:
668:
664:
658:
657:
653:
651:
647:
644:
642:
641:Seversky P-35
639:
637:
634:
632:
629:
627:
624:
622:
619:
617:
614:
612:
609:
607:
604:
602:
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584:
582:
579:
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559:
552:
547:
544:
541:
537:
534:
533:
532:
529:
521:
518:
515:
512:
509:
508:Combat range:
506:
503:
500:
499:
498:
496:
488:
485:
482:
478:
475:
472:
471:Gross weight:
469:
466:
465:Empty weight:
463:
460:
457:
454:
451:
448:
445:
442:
439:
436:
433:
432:
431:
429:
424:
423:
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405:
394:
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389:
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263:
259:
254:
249:
246:
242:
236:
233:
229:
228:
223:
218:
215:
211:
210:PZL.44 Wicher
207:
202:
200:
196:
192:
188:
187:heavy fighter
184:
180:
176:
172:
168:
160:
158:
156:
152:
148:
144:
140:
136:
132:
124:
120:
117:
113:
110:February 1939
109:
105:
101:
97:
92:
88:
84:
81:
78:
74:
70:
66:
63:
60:
58:
54:
50:
46:
43:
40:
36:
31:
27:
22:
17:
1869:PZL aircraft
1327:
1324:/ PZL Mielec
1227:PZL-106 Kruk
1173:PZL.56 Kania
1152:
1133:PZL.45 Sokół
1078:PZL.23 Karaś
996:
934:
923:
908:
901:
886:
877:
866:Bibliography
855:
846:
831:
826:
817:
794:
773:
749:
740:
723:. pp. 46–53.
717:
700:, pp. 55–60.
694:
650:
616:Macchi C.200
601:Fokker D.XXI
581:Bloch MB.150
574:
573:
569:PZL.56 Kania
557:
556:
545:
542:machine guns
535:
527:
525:
519:
513:
507:
501:
494:
492:
486:
476:
470:
464:
458:
452:
446:
440:
434:
427:
425:
421:
420:
381:, 2 x 20 mm
324:
321:
310:
302:
279:
273:
268:
257:
250:
237:
225:
221:
220:The project
219:
203:
164:
141:designed by
134:
130:
129:
123:PZL.56 Kania
107:First flight
99:Manufactured
86:Number built
76:Primary user
57:Manufacturer
1838:S-4 Kania 2
1435:TS-11 Iskra
1212:PZL-102 Kos
1108:PZL.38 Wilk
1098:PZL.30 Żubr
931:(in Polish)
874:(in Polish)
746:(in Polish)
721:(in Polish)
698:(in Polish)
495:Performance
487:Propellers:
477:Powerplant:
253:Józef Zając
191:PZL.38 Wilk
1853:Categories
1303:PZL Jak-12
1202:TS-16 Grot
1163:PZL.54 Ryś
1148:PZL.49 Miś
1138:PZL.46 Sum
1103:PZL.37 Łoś
654:References
621:MÁVAG Héja
459:Wing area:
329:Jerzy Cynk
317:Rawa Ruska
169:all-metal
1833:S-3 Kania
1430:TS-8 Bies
1420:LWD Szpak
1278:WSK Junak
935:Lotnictwo
596:Fiat G.50
447:Wingspan:
422:Data from
346:PZL.50/II
266:PZL P.11g
171:gull wing
987:aircraft
836:Archived
553:See also
540:km wz.36
528:Armament
340:PZL.50/I
335:Versions
189:-bomber
179:PZL P.24
167:PZL P.11
115:Variants
1232:PZL-107
453:Height:
441:Length:
366:PZL.50B
352:PZL.50A
280:PZL.50B
258:PZL.50A
94:History
1823:SZD-59
1818:SZD-56
1813:SZD-55
1808:SZD-54
1803:SZD-52
1798:SZD-51
1793:SZD-50
1788:SZD-49
1783:SZD-48
1778:SZD-45
1773:SZD-43
1768:SZD-42
1763:SZD-41
1758:SZD-40
1753:SZD-39
1748:SZD-38
1743:SZD-37
1738:SZD-36
1733:SZD-35
1728:SZD-34
1723:SZD-33
1718:SZD-32
1713:SZD-31
1708:SZD-30
1703:SZD-29
1698:SZD-28
1693:SZD-27
1688:SZD-26
1683:SZD-25
1678:SZD-24
1673:SZD-23
1668:SZD-22
1663:SZD-21
1658:SZD-20
1653:SZD-19
1648:SZD-18
1643:SZD-17
1638:SZD-16
1633:SZD-15
1628:SZD-14
1623:SZD-13
1618:SZD-12
1613:SZD-11
1608:SZD-10
1535:SZD-30
1523:Other:
1425:CSS-13
1413:Other:
1298:CSS-13
1293:CSS-12
1288:CSS-11
1283:CSS-10
1271:Other:
1168:PZL.55
1123:PZL.43
1118:PZL.42
1113:PZL.39
1093:PZL.27
1088:PZL.26
1073:PZL.19
1068:PZL.16
915:
893:
611:IAR 80
546:Bombs:
404:Poland
401:
306:Okęcie
222:PZL.50
195:PZL.39
68:Status
51:Poland
1603:SZD-9
1598:SZD-8
1593:SZD-7
1588:SZD-6
1583:SZD-C
1565:KR-03
1504:Kania
1460:Lim-6
1455:Lim-5
1450:Lim-2
1445:Lim-1
1308:MD-12
1033:PZL.5
1028:PZL.4
1023:PZL.3
659:Notes
536:Guns:
435:Crew:
269:Kobuz
232:Dowty
1545:PW-6
1540:PW-5
1530:Mi-2
1514:SW-4
1499:SM-4
1494:SM-2
1489:SM-1
1482:PZL:
1440:An-2
1404:I-22
1399:M-28
1394:M-26
1389:M-25
1384:M-24
1379:M-21
1374:M-20
1369:M-18
1364:M-17
1359:M-15
1337:PZL:
1195:PZL:
1083:P.24
1058:P.11
1006:PZL:
913:ISBN
891:ISBN
479:1 ×
313:Lwów
227:Hawk
135:Hawk
102:1939
38:Type
1828:S-1
1509:W-3
1354:M-4
1349:M-3
1344:M-2
1053:P.9
1048:P.8
1043:P.7
1038:P.6
1018:Ł.2
1013:P.1
985:PZL
327:by
206:PZL
145:at
1855::
933:.
876:.
803:^
782:^
759:^
748:.
728:^
705:^
666:^
157:.
1330:)
1326:(
999:)
995:(
977:e
970:t
963:v
919:.
897:.
437:1
133:(
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