255:
221:
26:
277:
122:
the prototype biplane trainer first flew on 25 May 1935. The aircraft was an equal-span biplane designed to use a variety of engines of 186 to 373 kW (249 to 500 hp). It was a two-seater and had a fixed tailwheel undercarriage. The Royal
Netherlands Air Force (LVA) ordered 25 aircraft in
179:, twenty-eight were clandestinely sold to the Republican government during the Spanish Civil War, all despite a Dutch embargo on the sale of arms to either side of that conflict. Some of those arriving in Spain were used as light bombers by the Republicans in the
204:
In
December 1941, the Royal Dutch East Indies Army had 27 F.K.51s available for service, and on 5 December 1941, its flying schools were shut down, allowing the F.K.51s to form two reconnaissance squadrons based on
1488:
571:
1146:
197:
aircraft. The Dutch Naval
Aviation Service's F.K.51s were used to carry neutrality patrols from January 1940, with most being damaged or destroyed during an attack on
1493:
798:
1503:
1139:
1498:
593:
609:
566:
190:
1132:
767:
791:
1219:
707:
Ledet, Michel (April 2002). "Le
Koolhoven FK-51: un succès commercial" [The Koolhoven FK-51: A Commercial Success].
171:
While the majority of F.K.51s were employed as elementary trainers within the
Netherlands or in reconnaissance roles by the
374:
148:
128:
267:
245:
235:
140:
132:
124:
76:
1310:
1194:
1483:
1315:
1259:
784:
240:
172:
72:
186:
The F.K.51s were in active use in Royal Dutch Flight
Schools during 1939–1940 in the training of young Dutch pilots.
1229:
886:
881:
841:
1234:
896:
891:
876:
871:
866:
861:
851:
846:
906:
856:
1124:
156:
1350:
1330:
1269:
1264:
159:
radials. Production totaled at least 142 aircraft. Twenty-four fuselages of the F.K.51 were assembled at
493:
1013:
1432:
1155:
822:
1407:
1355:
1300:
1224:
999:
955:
832:
807:
662:
540:
two 7.7 or 7.9 mm (0.303 or 0.311 in) machine guns, 1 in the wing and 1 for the observer.
119:
1448:
1345:
1279:
1437:
136:
1508:
1209:
763:
746:
729:
712:
289:
176:
1427:
1113:
1108:
1103:
1098:
1093:
1088:
1083:
1078:
1068:
1063:
1058:
1048:
1043:
1038:
1033:
1028:
1018:
1008:
198:
144:
62:
613:
1422:
1412:
1053:
1023:
147:. The Spanish Republican government ordered 28 F.K.51s, 11 with 298 kW (400 hp)
118:
was the winning design in a 1935 Dutch government contest for a new trainer. Designed by
1244:
1239:
1189:
127:
radial engine. A further 29 aircraft were later ordered with 261 kW (350 hp)
1477:
1417:
1392:
1360:
1340:
1184:
143:
bought 38 aircraft between 1936 and 1938 each powered by a 313 kW (420 hp)
1254:
1214:
1204:
930:
1305:
1199:
226:
99:
1249:
989:
984:
979:
974:
969:
964:
940:
935:
925:
920:
915:
25:
750:
733:
716:
193:
in May 1940, with several F.K.51s being destroyed on the ground by attacking
1335:
1325:
1320:
1284:
531:
304:
TracesOfWar.nl : FK-51, Koolhoven, Jane's All the World's
Aircraft 1937
194:
180:
160:
103:
52:
741:
Ledet, Michel (June 2002). "Le
Koolhoven FK-51: un succès commercial (3)".
189:
Some LVA F.K.51s were briefly used for reconnaissance duties following the
945:
423:
229 km/h (142 mph, 124 kn) at 2,200 m (7,200 ft)
398:
253 km/h (157 mph, 137 kn) at 2,200 m (7,200 ft)
760:
Bloody
Shambles: Volume One: The Drift to War to the Fall of Singapore
724:
Ledet, Michel (May 2002). "Le
Koolhoven FK-51: un succès commercial".
377:
7-cylinder, air-cooled radial piston engine, 261 kW (350 hp)
776:
33:
Koolhoven F.K.51 replica at Militaire Luchtvaart Museum Soesterberg
282:
260:
692:. London: Sampson Low, Marston & company, ltd. p. 239c.
206:
135:
ordered 29 aircraft each powered by a 335 kW (449 hp)
1128:
780:
758:
Shores, Christopher; Cull, Brian; Izawa, Yasuho (1992).
434:
206 km/h (128 mph; 111 kn) at sea level
409:
232 km/h (144 mph; 125 kn) at sea level
367:
220 L (58 US gal; 48 imp gal)
123:
1936 and 1937, powered by a 201 kW (270 hp)
572:
List of aircraft of the Spanish Republican Air Force
479:
3,000 m (9,800 ft) in 8 minutes 36 seconds
476:
2,000 m (6,600 ft) in 5 minutes 12 seconds
473:
1,000 m (3,300 ft) in 2 minutes 24 seconds
319:
2 (one observer or student, one pilot or instructor)
1373:
1293:
1177:
1163:
998:
954:
905:
831:
815:
1489:Aircraft of the Royal Netherlands East Indies Army
610:"Aircraft that took part in the Spanish Civil War"
155:) each powered by a 335 kW (449 hp)
1140:
792:
102:two-seat basic training biplane built by the
8:
743:Avions: Toute l'Aéronautique et son histoire
726:Avions: Toute l'Aéronautique et son histoire
709:Avions: Toute l'Aéronautique et son histoire
688:Grey, C.G.; Bridgman, Leonard, eds. (1937).
745:(in French). No. 111. pp. 39–49.
728:(in French). No. 110. pp. 39–47.
711:(in French). No. 109. pp. 48–54.
1174:
1147:
1133:
1125:
799:
785:
777:
663:"TracesOfWar.nl : FK-51, Koolhoven"
489:53.8 kg/m (11.0 lb/sq ft)
651:Shores, Cull and Izawa, 1992, pp. 59–60
583:
530:one or two 7.7 mm (0.303 in)
454:775 km (482 mi, 418 nmi)
448:84 km/h (52 mph; 45 kn)
15:
1494:1930s Dutch military trainer aircraft
1158:liaison/utility aircraft designations
7:
690:Jane's All the World's Aircraft 1937
594:Illustrated Encyclopedia of Aircraft
151:radials and 17 aircraft (designated
567:List of Interwar military aircraft
325:7.85 m (25 ft 9 in)
191:German invasion of the Netherlands
14:
498:0.18 kW/kg (0.11 hp/lb)
661:Vermeer, Wilco (13 April 2009).
337:2.8 m (9 ft 2 in)
275:
253:
219:
41:Trainer, Reconnaissance Aircraft
24:
1504:Single-engined tractor aircraft
343:27 m (290 sq ft)
331:9 m (29 ft 6 in)
383:2-bladed fixed-pitch propeller
1:
956:Nationale Vliegtuig Industrie
460:6,300 m (20,700 ft)
375:Armstrong Siddeley Cheetah IX
361:1,600 kg (3,527 lb)
355:1,450 kg (3,197 lb)
149:Armstrong Siddeley Jaguar IVa
129:Armstrong Siddeley Cheetah IX
1499:Aircraft first flown in 1935
268:Spanish Republican Air Force
246:Royal Dutch East Indies Army
236:Dutch Naval Aviation Service
141:Royal Dutch East Indies Army
133:Dutch Naval Aviation Service
125:Armstrong Siddeley Cheetah V
77:Spanish Republican Air Force
642:Ledet June 2002, pp. 43, 46
349:990 kg (2,183 lb)
241:Royal Netherlands Air Force
173:Royal Netherlands Air Force
73:Royal Netherlands Air Force
1525:
633:Ledet June 2002, pp. 39–40
1457:
1000:N.V. Koolhoven Vliegtuige
552:Provision for one camera
32:
23:
18:
907:British Aerial Transport
816:Pre-World War I aircraft
762:. London: Grub Street.
310:General characteristics
157:Wright R-975E Whirlwind
110:Design and development
596:(Part Work 1982-1985)
1156:Spanish Armed Forces
823:Koolhoven Heidevogel
833:Armstrong Whitworth
598:. Orbis Publishing.
359:Max takeoff weight:
167:Operational history
137:Pratt & Whitney
120:Frederick Koolhoven
69:Primary users
1484:Koolhoven aircraft
667:www.tracesofwar.nl
1471:
1470:
1381:
1369:
1368:
1171:
1122:
1121:
464:Time to altitude:
290:Spanish Air Force
183:region of Spain.
177:Dutch East Indies
104:Koolhoven Company
92:
91:
1516:
1464:No details known
1404:
1399:
1389:
1379:
1175:
1169:
1149:
1142:
1135:
1126:
931:F.K.25 Basilisk
801:
794:
787:
778:
773:
754:
737:
720:
694:
693:
685:
679:
678:
676:
674:
658:
652:
649:
643:
640:
634:
631:
625:
624:
622:
621:
612:. Archived from
606:
600:
599:
588:
550:
506:
458:Service ceiling:
391:
312:
281:
279:
278:
259:
257:
256:
225:
223:
222:
199:De Kooy Airfield
145:Wright Whirlwind
116:Koolhoven F.K.51
96:Koolhoven F.K.51
85:
43:Type of aircraft
28:
16:
1524:
1523:
1519:
1518:
1517:
1515:
1514:
1513:
1474:
1473:
1472:
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1365:
1289:
1168:
1159:
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1123:
1118:
994:
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827:
811:
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770:
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723:
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703:
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672:
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632:
628:
619:
617:
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603:
590:
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558:
551:
546:
534:(s) in the wing
514:
507:
502:
466:
387:
308:
298:
276:
274:
254:
252:
220:
218:
215:
169:
112:
83:
75:
44:
12:
11:
5:
1522:
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1496:
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1462:
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1415:
1410:
1405:
1400:
1395:
1390:
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1371:
1370:
1367:
1366:
1364:
1363:
1358:
1353:
1348:
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1338:
1333:
1328:
1323:
1318:
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1308:
1303:
1297:
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1287:
1282:
1277:
1272:
1267:
1262:
1257:
1252:
1247:
1242:
1237:
1232:
1227:
1222:
1217:
1212:
1207:
1202:
1197:
1192:
1187:
1181:
1179:
1172:
1161:
1160:
1154:
1152:
1151:
1144:
1137:
1129:
1120:
1119:
1117:
1116:
1111:
1106:
1101:
1096:
1091:
1086:
1081:
1076:
1071:
1066:
1061:
1056:
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1036:
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1026:
1021:
1016:
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1005:
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992:
987:
982:
977:
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961:
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951:
949:
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943:
938:
933:
928:
923:
918:
912:
910:
903:
902:
900:
899:
894:
889:
884:
879:
874:
869:
864:
859:
854:
849:
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838:
836:
829:
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826:
825:
819:
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806:
804:
803:
796:
789:
781:
775:
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768:
755:
738:
721:
702:
699:
696:
695:
680:
653:
644:
635:
626:
601:
582:
581:
579:
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569:
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541:
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525:
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500:
499:
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483:
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468:
467:
461:
455:
449:
446:Landing speed:
442:
441:
440:
439:
438:
437:
436:
435:
425:
424:
417:
416:
415:
414:
413:
412:
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410:
400:
399:
396:Maximum speed:
385:
384:
378:
368:
365:Fuel capacity:
362:
356:
350:
344:
338:
332:
326:
320:
297:
296:Specifications
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13:
10:
9:
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4:
3:
2:
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1324:
1322:
1319:
1317:
1314:
1312:
1309:
1307:
1304:
1302:
1299:
1298:
1296:
1294:Second series
1292:
1286:
1283:
1281:
1278:
1276:
1273:
1271:
1268:
1266:
1263:
1261:
1258:
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1191:
1188:
1186:
1183:
1182:
1180:
1176:
1173:
1166:
1162:
1157:
1150:
1145:
1143:
1138:
1136:
1131:
1130:
1127:
1115:
1112:
1110:
1107:
1105:
1102:
1100:
1097:
1095:
1092:
1090:
1087:
1085:
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1080:
1077:
1075:
1072:
1070:
1067:
1065:
1062:
1060:
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983:
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976:
973:
971:
968:
966:
963:
962:
960:
957:
953:
947:
944:
942:
939:
937:
934:
932:
929:
927:
926:F.K.24 Baboon
924:
922:
921:F.K.23 Bantam
919:
917:
914:
913:
911:
908:
904:
898:
895:
893:
890:
888:
885:
883:
880:
878:
875:
873:
870:
868:
865:
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848:
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839:
837:
834:
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824:
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820:
818:
814:
809:
802:
797:
795:
790:
788:
783:
782:
779:
771:
769:0-948817-50-X
765:
761:
756:
752:
748:
744:
739:
735:
731:
727:
722:
718:
714:
710:
705:
704:
700:
691:
684:
681:
668:
664:
657:
654:
648:
645:
639:
636:
630:
627:
616:on 2015-02-05
615:
611:
605:
602:
597:
595:
587:
584:
577:
573:
570:
568:
565:
564:
563:
562:
561:Related lists
555:
553:
549:
539:
538:#400 to #428:
536:
533:
529:
526:
523:
520:
519:
518:
517:
513:
510:
509:
508:
505:
497:
495:
491:
488:
487:Wing loading:
485:
484:
478:
475:
472:
471:
470:
469:
465:
462:
459:
456:
453:
450:
447:
444:
443:
433:
432:
431:
430:
429:
428:
427:
426:
422:
421:Cruise speed:
419:
418:
408:
407:
406:
405:
404:
403:
402:
401:
397:
394:
393:
392:
390:
382:
379:
376:
372:
369:
366:
363:
360:
357:
354:
353:Gross weight:
351:
348:
347:Empty weight:
345:
342:
339:
336:
333:
330:
327:
324:
321:
318:
315:
314:
313:
311:
306:
305:
302:
295:
291:
288:
287:
284:
273:
272:
269:
266:
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251:
250:
247:
244:
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239:
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233:
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228:
217:
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210:
208:
202:
200:
196:
192:
187:
184:
182:
178:
174:
166:
164:
162:
158:
154:
150:
146:
142:
139:radials. The
138:
134:
130:
126:
121:
117:
109:
107:
105:
101:
97:
87:
82:
81:
78:
74:
71:
68:
67:
64:
61:
59:First flight
58:
57:
54:
51:
49:Manufacturer
48:
47:
40:
37:
36:
31:
27:
22:
17:
1461:Not assigned
1374:
1274:
1178:First series
1164:
1073:
842:F.K.1 Sissit
759:
742:
725:
708:
701:Bibliography
689:
683:
671:. Retrieved
666:
656:
647:
638:
629:
618:. Retrieved
614:the original
604:
591:
586:
560:
559:
547:
545:
537:
527:
521:
511:
503:
501:
492:
486:
463:
457:
451:
445:
420:
395:
388:
386:
380:
370:
364:
358:
352:
346:
340:
334:
328:
322:
316:
309:
307:
303:
300:
299:
203:
188:
185:
170:
152:
131:engine. The
115:
113:
98:was a 1930s
95:
93:
84:Number built
946:F.K.28 Crow
673:26 December
528:#11 to #25:
524:no armament
389:Performance
381:Propellers:
371:Powerplant:
227:Netherlands
201:on 10 May.
1478:Categories
1375:Utilitario
669:(in Dutch)
620:2015-01-10
578:References
522:#1 to #10:
494:Power/mass
341:Wing area:
181:Cantabrian
1280:L.18 (II)
958:aircraft]
808:Koolhoven
751:1243-8650
734:1243-8650
717:1243-8650
532:Lewis gun
329:Wingspan:
301:Data from
213:Operators
195:Luftwaffe
161:Aviolanda
153:F.K.51bis
53:Koolhoven
1509:Biplanes
1275:L.18 (I)
1230:L.9 (II)
1002:aircraft
909:aircraft
835:aircraft
810:aircraft
556:See also
548:Avionics
504:Armament
1388:U.1–U.8
1380:Utility
1225:L.9 (I)
1170:Liaison
335:Height:
323:Length:
175:in the
19:F.K.51
1165:Enlace
1114:F.K.59
1109:F.K.58
1104:F.K.57
1099:F.K.56
1094:F.K.55
1089:F.K.54
1084:F.K.53
1079:F.K.52
1074:F.K.51
1069:F.K.50
1064:F.K.49
1059:F.K.48
1054:F.K.47
1049:F.K.46
1044:F.K.45
1039:F.K.44
1034:F.K.43
1029:F.K.42
1024:F.K.41
1019:F.K.40
1014:F.K.36
1009:F.K.30
990:F.K.35
985:F.K.34
980:F.K.33
975:F.K.32
970:F.K.31
965:F.K.29
941:F.K.27
936:F.K.26
916:F.K.22
897:F.K.13
892:F.K.12
887:F.K.10
766:
749:
732:
715:
452:Range:
280:
258:
224:
1423:UD.14
1413:UD.13
882:F.K.9
877:F.K.8
872:F.K.7
867:F.K.6
862:F.K.5
857:F.K.4
852:F.K.3
847:F.K.2
512:Guns:
317:Crew:
283:Spain
261:Spain
100:Dutch
38:Role
1449:U.20
1445:U.19
1442:U.18
1438:U.17
1433:U.16
1428:U.15
1418:U.14
1408:U.12
1403:U.11
1398:U.10
1361:L.13
1356:L.12
1351:L.11
1346:L.10
1285:L.19
1270:L.17
1265:L.16
1260:L.15
1255:L.14
1250:L.13
1245:L.12
1240:L.11
1235:L.10
764:ISBN
747:ISSN
730:ISSN
713:ISSN
675:2019
592:The
373:1 ×
207:Java
114:The
94:The
88:142
63:1935
1393:U.9
1377:(U)
1341:L.9
1336:L.8
1331:L.7
1326:L.6
1321:L.5
1316:L.4
1311:L.3
1306:L.2
1301:L.1
1220:L.8
1215:L.7
1210:L.6
1205:L.5
1200:L.4
1195:L.3
1190:L.2
1185:L.1
1167:(L)
1480::
665:.
209:.
163:.
106:.
1148:e
1141:t
1134:v
800:e
793:t
786:v
772:.
753:.
736:.
719:.
677:.
623:.
496::
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