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PZL.50 Jastrząb

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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
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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
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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
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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,
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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
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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.
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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,
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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
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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
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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
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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.
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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.
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to Citroën plant at Czerniakowska Street, where they were captured by the Germans, and possibly scrapped after 1940.
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Second prototype with fuselage changes (elongated fuselage, long canopy fairing) and with redesigned engine cowling.
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Cynk, Jerzy B. "PZL.50 Jastrząb w prawdziwej postaci ('The PZL.50 Jastrząb in an authentic shape')"
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expected, that a basic Polish general-purpose fighter and light bomber would be a twin-engine
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Gruszczyński, Jerzy. "Jastrząb nie zdążył..." ('The Jastrząb hasn't made it...')
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In early 1930s the Polish Air Force was equipped with the then state-of-the-art
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fighters were ordered, fitting the P.11c airframe with Mercury VIII engines.
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Photos and drawing of PZL.50A and 3-d drawing of the PZL.50/I at Ugolok neba
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Planned first production variant based on second prototype, powered by
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Cynk, Jerzy B. "P.Z.L. P.50 Jastrząb (They didn't quite... No. 16)."
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9-cylinder air-cooled radial piston engine, 615 kW (825 hp)
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monoplanes, the latest of a family of fighter aircraft designed by
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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
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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 1573: 1557: 1522: 1481: 1472: 1412: 1336: 1320: 1270: 1194: 1185: 1005: 992: 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: 708: 706: 685: 683: 681: 679: 677: 675: 673: 671: 669: 667: 663: 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 1846: 1845: 1553: 1552: 1468: 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: 1891: 1479: 1334: 1262:PZL-230 Skorpion 1192: 1003: 993:PZL - up to 1939 978: 971: 964: 955: 932: 922:Glass, Andrzej. 907:Green, William. 875: 860: 857: 851: 848: 842: 828: 822: 819: 813: 810: 799: 796: 790: 787: 778: 775: 769: 766: 755: 747: 742: 736: 733: 724: 722: 714: 701: 699: 691: 636:Reggiane Re.2000 631:Polikarpov I-180 530: 514:Service ceiling: 497: 481:PZL Merkury VIII 430: 411:Polish Air Force 402: 400: 399: 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 28: 16: 1899: 1898: 1894: 1893: 1892: 1890: 1889: 1888: 1849: 1848: 1847: 1842: 1575: 1569: 1549: 1518: 1464: 1408: 1323: 1312: 1266: 1242:PZL-111 Koliber 1237:PZL-110 Koliber 1222:PZL-105 Flaming 1187: 1177: 1153:PZL.50 Jastrząb 994: 988: 982: 945: 940: 930: 885:Cynk, Jerzy B. 873: 863: 858: 854: 849: 845: 840:Wayback Machine 829: 825: 820: 816: 811: 802: 797: 793: 788: 781: 776: 772: 767: 758: 745: 743: 739: 734: 727: 720: 715: 704: 697: 693:Cynk, Jerzy B. 692: 665: 656: 555: 531: 526: 493: 426: 419: 397: 395: 392: 337: 301: 214:Bristol Mercury 163: 131:PZL.50 Jastrząb 121: 48:National origin 19:PZL.50 Jastrząb 12: 11: 5: 1897: 1895: 1887: 1886: 1881: 1876: 1871: 1866: 1861: 1851: 1850: 1844: 1843: 1841: 1840: 1835: 1830: 1825: 1820: 1815: 1810: 1805: 1800: 1795: 1790: 1785: 1780: 1775: 1770: 1765: 1760: 1755: 1750: 1745: 1740: 1735: 1730: 1725: 1720: 1715: 1710: 1705: 1700: 1695: 1690: 1685: 1680: 1675: 1670: 1665: 1660: 1655: 1650: 1645: 1640: 1635: 1630: 1625: 1620: 1615: 1610: 1605: 1600: 1595: 1590: 1585: 1579: 1577: 1571: 1570: 1568: 1567: 1561: 1559: 1558:WSK PZL-Krosno 1555: 1554: 1551: 1550: 1548: 1547: 1542: 1537: 1532: 1526: 1524: 1520: 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756: 737: 725: 702: 662: 661: 660: 655: 652: 649: 648: 643: 638: 633: 628: 626:Nakajima Ki-43 623: 618: 613: 608: 603: 598: 593: 588: 583: 572: 571: 566: 554: 551: 550: 549: 543: 524: 523: 520:Rate of climb: 517: 511: 505: 502:Maximum speed: 491: 490: 484: 474: 468: 462: 456: 450: 444: 438: 418: 415: 414: 413: 407: 406: 391: 388: 387: 386: 373:(1,060 hp) or 367: 364: 353: 350: 347: 344: 341: 336: 333: 300: 297: 284:Bristol Taurus 241:Galeazzo Ciano 183:Ludomił Rayski 162: 159: 126: 125: 116: 112: 111: 108: 104: 103: 100: 96: 95: 91: 90: 87: 83: 82: 77: 73: 72: 69: 65: 64: 59: 53: 52: 49: 45: 44: 39: 35: 34: 30: 29: 21: 20: 13: 10: 9: 6: 4: 3: 2: 1896: 1885: 1882: 1880: 1877: 1875: 1872: 1870: 1867: 1865: 1862: 1860: 1857: 1856: 1854: 1839: 1836: 1834: 1831: 1829: 1826: 1824: 1821: 1819: 1816: 1814: 1811: 1809: 1806: 1804: 1801: 1799: 1796: 1794: 1791: 1789: 1786: 1784: 1781: 1779: 1776: 1774: 1771: 1769: 1766: 1764: 1761: 1759: 1756: 1754: 1751: 1749: 1746: 1744: 1741: 1739: 1736: 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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: 1171: 1169: 1166: 1164: 1161: 1159: 1156: 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: 1056: 1054: 1051: 1049: 1046: 1044: 1041: 1039: 1036: 1034: 1031: 1029: 1026: 1024: 1021: 1019: 1016: 1014: 1011: 1010: 1008: 1004: 1001: 998: 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: 807: 805: 801: 795: 792: 786: 784: 780: 774: 771: 765: 763: 761: 757: 753: 752: 741: 738: 732: 730: 726: 719: 713: 711: 709: 707: 703: 696: 690: 688: 686: 684: 682: 680: 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: 599: 597: 594: 592: 589: 587: 584: 582: 579: 578: 577: 576: 570: 567: 565: 562: 561: 560: 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: 416: 412: 409: 408: 405: 394: 393: 389: 384: 380: 376: 372: 368: 365: 362: 358: 354: 351: 348: 345: 342: 339: 338: 334: 332: 330: 326: 320: 318: 314: 309: 307: 298: 296: 294: 290: 285: 281: 277: 272: 270: 267: 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:(

Index


Fighter aircraft
Manufacturer
Państwowe Zakłady Lotnicze
Polish Air Force
PZL.53 Jastrząb II
PZL.56 Kania
fighter aircraft
Wsiewołod Jakimiuk
Państwowe Zakłady Lotnicze
Polish Military Aviation
Nazi-Soviet Invasion of Poland
PZL P.11
gull wing
Zygmunt Puławski
PZL P.24
Ludomił Rayski
heavy fighter
PZL.38 Wilk
PZL.39
interceptor aircraft
PZL
PZL.44 Wicher
Bristol Mercury
Hawk
Dowty
Galeazzo Ciano
Bolesław Orliński
Józef Zając
Morane-Saulnier MS 406

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