121:
coolant and a retractable radiator. Flight trials started but soon showed that the evaporative cooling system was inadequate with both the engine and the wing centre section overheating. Ilyushin was also very aware of the vulnerability of the system to combat damage, but he was ordered by
105:
The I-21 was an all-metal, low-wing, cantilever monoplane with retractable undercarriage and a closed cockpit. The wings were sharply tapered with straight trailing edges, which introduced sweepback on the leading edge. Two specially modified
1282:
110:(also written AM-34FRN) liquid-cooled V-12 engines provided the power via a non-reducing gearbox, which was used only to raise the thrust line, and enable the use of shorter undercarriage legs.
837:
117:
which dispensed with radiators and used condensers built into the surface of the wing centre section. The second prototype was fitted with a conventional cooling system using
847:
453:
830:
1287:
1272:
1297:
823:
419:
988:
446:
154:(I-21 2nd prototype) with conventional ethylene glycol cooling system, not completed due to engine delivery problems.
1292:
1277:
439:
1236:
1204:
671:
518:
303:
126:
to use this system. Further development was halted in 1939 and the I-21 designation was re-used for the
1165:
921:
916:
107:
1220:
931:
911:
1140:
528:
973:
114:
415:
335:
1175:
1160:
1095:
1080:
946:
650:
217:
90:
1228:
1070:
1050:
963:
958:
953:
941:
876:
871:
804:
742:
722:
706:
701:
645:
640:
635:
533:
360:
123:
118:
815:
1244:
1212:
1135:
1075:
1043:
1028:
1023:
1008:
896:
891:
881:
866:
788:
737:
732:
727:
696:
691:
686:
681:
676:
666:
630:
625:
620:
615:
610:
605:
589:
584:
579:
574:
569:
523:
513:
508:
1266:
1185:
1018:
983:
901:
783:
778:
564:
559:
554:
549:
503:
498:
482:
127:
263:
460 km (250 nmi; 290 mi) at 480 km/h (300 mph; 260 kn)
247:
766 km (476 mi, 414 nmi) at 270 km/h (170 mph; 150 kn)
1085:
936:
926:
752:
407:
342:
906:
886:
768:
747:
1105:
241:
620 km/h (390 mph, 330 kn) at 5,000 m (16,000 ft)
462:
51:
431:
94:
819:
435:
220:
V-12 liquid-cooled piston engine, 930 kW (1,250 hp)
1241:
1225:
1217:
1209:
1283:
Abandoned military aircraft projects of the Soviet Union
412:
97:
in 1936-7 in response to a government specification.
1194:
1149:
1114:
1059:
855:
797:
761:
715:
659:
598:
542:
491:
470:
355:
Aircraft of comparable role, configuration, and era
293:
5,000 metres (16,000 ft) in 3.8 to 4.6 minutes
113:Cooling for the first prototype's engine used an
1061:
1116:
831:
447:
148:(I-21 1st prototype) with evaporative cooling
8:
1151:
1233:
1201:
838:
824:
816:
454:
440:
432:
402:
400:
384:
382:
380:
378:
374:
18:
16:1936 Soviet fighter aircraft prototype
299:116 kg/m (24 lb/sq ft)
7:
393:. London: Ian Allan. pp. 13–14.
198:18.16 m (195.5 sq ft)
89:, was a single-engined, single-seat
186:8.366 m (27 ft 5 in)
857:
287:20.32 m/s (4,000 ft/min)
14:
226:3-bladed constant-speed propeller
192:10 m (32 ft 10 in)
85:-21, fighter-21), also known as
1288:Single-engined tractor aircraft
281:12,000 m (39,000 ft)
1:
1273:1930s Soviet fighter aircraft
210:2,125 kg (4,685 lb)
204:1,402 kg (3,091 lb)
1298:Aircraft first flown in 1936
1314:
1210:Twin-engine cannon fighter
1253:
1218:Long-Range escort fighter
21:
1226:Two-seat armored fighter
315:190 m (620 ft)
389:Gordon, Yefim. (2004).
171:General characteristics
101:Design and development
159:Specifications (I-21)
1255:Unknown/not assigned
1242:Heavy escort fighter
1115:Multi-seat fighter (
848:fighter designations
1202:Short-range fighter
1181:IP-5 through IP-20
1060:Two-seat fighter (
660:Passenger aircraft
414:. London: Osprey.
336:ShKAS machine guns
115:evaporative system
1293:Low-wing aircraft
1278:Ilyushin aircraft
1260:
1259:
813:
812:
291:Time to altitude:
75:
74:
1305:
1243:
1235:
1227:
1219:
1211:
1203:
1182:
1172:
1153:
1150:Cannon fighter (
1132:
1127:
1118:
1102:
1092:
1063:
1040:
1035:
1015:
1005:
1000:
995:
970:
859:
840:
833:
826:
817:
456:
449:
442:
433:
426:
425:
404:
395:
394:
386:
323:
279:Service ceiling:
234:
218:Mikulin AM-34FRN
173:
108:Mikulin AM-34RNF
93:produced in the
68:
40:
32:Type of aircraft
19:
1313:
1312:
1308:
1307:
1306:
1304:
1303:
1302:
1263:
1262:
1261:
1256:
1249:
1234:Folding fighter
1190:
1180:
1170:
1145:
1130:
1125:
1110:
1100:
1090:
1055:
1038:
1033:
1013:
1003:
998:
993:
968:
851:
844:
814:
809:
793:
757:
711:
655:
594:
538:
492:Attack aircraft
487:
466:
460:
430:
429:
422:
406:
405:
398:
388:
387:
376:
371:
361:Polikarpov I-17
352:
331:
324:
319:
309:
248:
230:
169:
161:
136:
119:ethylene glycol
103:
66:
39:National origin
38:
33:
17:
12:
11:
5:
1311:
1309:
1301:
1300:
1295:
1290:
1285:
1280:
1275:
1265:
1264:
1258:
1257:
1254:
1251:
1250:
1248:
1247:
1239:
1231:
1223:
1215:
1207:
1198:
1196:
1192:
1191:
1189:
1188:
1183:
1178:
1173:
1168:
1163:
1157:
1155:
1147:
1146:
1144:
1143:
1138:
1133:
1128:
1122:
1120:
1112:
1111:
1109:
1108:
1103:
1098:
1093:
1088:
1083:
1078:
1073:
1067:
1065:
1057:
1056:
1054:
1053:
1047:
1046:
1041:
1036:
1031:
1026:
1021:
1016:
1011:
1006:
1001:
996:
991:
986:
981:
976:
971:
966:
961:
956:
951:
950:
949:
939:
934:
929:
924:
919:
914:
909:
904:
899:
894:
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884:
879:
874:
869:
863:
861:
853:
852:
845:
843:
842:
835:
828:
820:
811:
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799:
795:
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791:
786:
781:
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771:
765:
763:
759:
758:
756:
755:
750:
745:
740:
735:
730:
725:
719:
717:
716:Reconnaissance
713:
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704:
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694:
689:
684:
679:
674:
669:
663:
661:
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648:
643:
638:
633:
628:
623:
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613:
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587:
582:
577:
572:
567:
562:
557:
552:
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531:
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428:
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396:
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370:
367:
364:
363:
351:
348:
347:
346:
339:
332:
317:
316:
310:
300:
294:
288:
285:Rate of climb:
282:
275:
274:
273:
272:
271:
270:
269:
268:
267:
266:
265:
264:
250:
249:
242:
239:Maximum speed:
228:
227:
221:
211:
205:
199:
193:
187:
181:
160:
157:
156:
155:
152:
149:
146:
135:
132:
102:
99:
73:
72:
69:
63:
62:
59:
55:
54:
49:
45:
44:
41:
35:
34:
31:
28:
24:
23:
15:
13:
10:
9:
6:
4:
3:
2:
1310:
1299:
1296:
1294:
1291:
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1284:
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1279:
1276:
1274:
1271:
1270:
1268:
1252:
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1240:
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1230:
1224:
1222:
1216:
1214:
1208:
1206:
1200:
1199:
1197:
1193:
1187:
1184:
1179:
1177:
1174:
1169:
1167:
1164:
1162:
1159:
1158:
1156:
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1142:
1139:
1137:
1134:
1129:
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1123:
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1113:
1107:
1104:
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1079:
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1027:
1025:
1022:
1020:
1017:
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1010:
1007:
1002:
997:
992:
990:
987:
985:
982:
980:
977:
975:
972:
967:
965:
962:
960:
957:
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952:
948:
945:
944:
943:
940:
938:
935:
933:
930:
928:
925:
923:
920:
918:
915:
913:
910:
908:
905:
903:
900:
898:
895:
893:
890:
888:
885:
883:
880:
878:
875:
873:
870:
868:
865:
864:
862:
854:
849:
841:
836:
834:
829:
827:
822:
821:
818:
806:
803:
802:
800:
796:
790:
787:
785:
782:
780:
777:
775:
772:
770:
767:
766:
764:
760:
754:
751:
749:
746:
744:
741:
739:
736:
734:
731:
729:
726:
724:
721:
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718:
714:
708:
705:
703:
700:
698:
695:
693:
690:
688:
685:
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678:
675:
673:
670:
668:
665:
664:
662:
658:
652:
649:
647:
644:
642:
639:
637:
634:
632:
629:
627:
624:
622:
619:
617:
614:
612:
609:
607:
604:
603:
601:
597:
591:
588:
586:
583:
581:
578:
576:
573:
571:
568:
566:
563:
561:
558:
556:
553:
551:
548:
547:
545:
541:
535:
532:
530:
527:
525:
522:
520:
517:
515:
512:
510:
507:
505:
502:
500:
497:
496:
494:
490:
484:
481:
479:
476:
475:
473:
469:
464:
457:
452:
450:
445:
443:
438:
437:
434:
423:
421:1-85532-405-9
417:
413:
409:
408:Gunston, Bill
403:
401:
397:
392:
385:
383:
381:
379:
375:
368:
366:
362:
359:
358:
357:
356:
349:
344:
340:
338:(initial fit)
337:
333:
330:
327:
326:
325:
322:
314:
313:Take-off run:
311:
307:
305:
301:
298:
297:Wing loading:
295:
292:
289:
286:
283:
280:
277:
276:
262:
261:
260:
259:
258:
257:
256:
255:
254:
253:
252:
251:
246:
243:
240:
237:
236:
235:
233:
225:
222:
219:
215:
212:
209:
208:Gross weight:
206:
203:
202:Empty weight:
200:
197:
194:
191:
188:
185:
182:
179:
176:
175:
174:
172:
167:
165:
158:
153:
150:
147:
144:
143:
142:
141:OKB Ilyushin
140:
133:
131:
129:
128:Pashinin I-21
125:
120:
116:
111:
109:
100:
98:
96:
92:
88:
84:
80:
79:Ilyushin I-21
70:
65:
64:
60:
58:First flight
57:
56:
53:
50:
48:Manufacturer
47:
46:
42:
37:
36:
29:
26:
25:
20:
978:
773:
762:Experimental
672:Il-18 (1946)
477:
411:
391:OKB Ilyushin
390:
365:
354:
353:
343:ShVAK cannon
328:
320:
318:
312:
302:
296:
290:
284:
278:
244:
238:
231:
229:
223:
213:
207:
201:
195:
189:
183:
177:
170:
168:
166:OKB Ilyushin
163:
162:
138:
137:
112:
104:
86:
82:
78:
76:
67:Number built
1195:Descriptors
850:, 1923–1940
345:(later fit)
334:4x 7.62 mm
232:Performance
224:Propellers:
214:Powerplant:
139:Data from:'
1267:Categories
856:Fighters (
728:Il-22 (II)
611:Il-20 (II)
599:Transports
369:References
308:0.59 hp/kg
304:Power/mass
196:Wing area:
83:Istrebitel
61:late 1936
984:I-21 (II)
570:Il-22 (I)
519:Il-20 (I)
341:2x 20 mm
190:Wingspan:
164:Data from
979:I-21 (I)
872:I-1 (II)
471:Fighters
465:aircraft
463:Ilyushin
410:(1995).
350:See also
321:Armament
134:Variants
52:Ilyushin
867:I-1 (I)
846:Soviet
798:Trainer
651:PAK VTA
543:Bombers
184:Length:
151:TsKB 52
145:TsKB 32
91:fighter
87:TsKB-32
30:Fighter
805:Il-103
743:Il-140
723:Il-20M
707:Il-114
702:Il-108
646:Il-276
641:Il-112
636:Il-106
534:Il-102
418:
245:Range:
1186:IP-21
789:Il-26
753:A-100
738:Il-38
733:Il-24
697:Il-96
692:Il-90
687:Il-86
682:Il-62
677:Il-18
667:Il-14
631:Il-80
626:Il-78
621:Il-76
616:Il-32
606:Il-12
590:Il-54
585:Il-46
580:Il-30
575:Il-28
529:Il-42
524:Il-40
514:Il-16
509:Il-10
329:Guns:
178:Crew:
43:USSR
27:Role
22:I-21
1176:IP-4
1171:IP-3
1166:IP-2
1161:IP-1
1141:MI-4
1136:MI-3
1131:MI-2
1126:MI-1
1106:DI-8
1101:DI-7
1096:DI-6
1091:DI-5
1086:DI-4
1081:DI-3
1076:DI-2
1071:DI-1
1044:I-33
1039:I-32
1034:I-31
1029:I-30
1024:I-29
1019:I-28
1014:I-27
1009:I-26
1004:I-25
999:I-24
994:I-23
989:I-22
974:I-20
969:I-19
964:I-18
959:I-17
954:I-16
942:I-15
937:I-14
932:I-13
927:I-12
922:I-11
917:I-10
784:Il-8
779:Il-1
774:I-21
769:A-60
748:A-50
565:Il-6
560:DB-4
555:Il-4
550:DB-3
504:Il-8
499:Il-2
483:Il-1
478:I-21
416:ISBN
216:1 ×
124:GUAP
95:USSR
77:The
1245:TIS
1229:DIT
1221:DIS
1213:DIP
1051:I-Z
947:ter
912:I-9
907:I-8
902:I-7
897:I-6
892:I-5
887:I-4
882:I-3
877:I-2
81:, (
1269::
1237:IS
1205:BI
1152:IP
1117:MI
1062:DI
399:^
377:^
130:.
71:2
1154:)
1119:)
1064:)
860:)
858:I
839:e
832:t
825:v
455:e
448:t
441:v
424:.
306::
180:1
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