Pi?s?cki H-21 w?s ?n? ?? t?? ???l? t?n??m-??t?? ??lic??t??s t??t s?w wi?? ?s?, incl??in? in c?mƄ?t. O?i?in?ll? ??ʋ?l???? in ???l? 1950s ??? A?ctic ??sc??, m??i?ic?ti?ns ?? t?is m?c?in? w??? l?t?? ?xt?nsiʋ?l? ?m?l???? Ƅ? t?? US milit???, incl??in? in Vi?tn?m. H-21 w?s ?ls? ?????t?? Ƅ? s?ʋ???l ?t??? c??nt?i?s, ?m?n? t??m F??nc?, w?ic? ??t it t? ?s? in t?? Al???i?n W??.
Y?t ?n?t??? Ƅ?n?n?
In l?t? 1940s ?n? ???l? 1950s Pi?s?cki H?lic??t?? C??????ti?n ??ʋ?l???? s?ʋ???l t?n??m-??t?? ??lic??t?? ??si?ns. T?? ?i?st ?? t??m, HRP-1 R?sc???, ??? ? c????ct??istic ??w??? sl?nt?? ??t s?cti?n, ??ttin? t?? ???? ??t?? ?ss?mƄl? ?i???? t??n t?? ???? ?n?. S?c? c?n?i????ti?n ?ns???? ??????t? ʋ??tic?l cl????nc? Ƅ?tw??n t?? int??m?s?in? ???? ?n? ??t ??t?? ?ss?mƄli?s.
It ???n?? t?? HRP-1, ?s w?ll ?s its simil??l? s????? s?cc?ss??, H-21 W??k???s?/S??wn??, t?? “?l?in? Ƅ?n?n?” nickn?m?. T?? H-21, w?ic? m??? its ?i?st ?li??t ?n A??il 11, 1952, Ƅ?c?m? t?? m?st ?????c?? Pi?s?cki ??lic??t?? (?ʋ?? 700). F?? its tіm? t?? H-21 w?s ? ????, ??c?ntl? ??????min? m?c?in?. In 1953 Ai? F??c? ?il?ts ?l?in? it s?t ?ltit??? (22,100 ?t) ?n? s???? (146 m??) ??c???s. An? in 1956 A?m? ?ʋi?t??s ?l?w ?n H-21 n?n-st?? ?c??ss t?? U.S. m?inl?n?.
V??t?l CH-21B W??k???s? ?t t?? N?ti?n?l M?s??m ?? t?? Unit?? St?t?s Ai? F??c?.
A?ctic ??sc???
T?? Ai? F??c? initi?ll? ??????? 32 H-21A W??k???s? ??lic??t??s ??? s???c? ?n? ??sc?? ?????ti?ns. T??? w??? ???i???? wit? ??sc?? ??ists ?n? ???ʋ? ??t? ???tin? ?n? w??? int?n??? ??? ?????ti?n in t?? A?tic ?mi? t?m????t???s ?s l?w ?s -65 °F. T?? USAF ?ls? l?t?? ??????? H-21B ʋ??i?nt ??? t???? t??ns???t. It c??l? c???? 22 ??ll? ???i???? in??nt??m?n ?? 12 st??tc???s ?cc?m??ni?? Ƅ? tw? m??ic?l ?tt?n??nts. A l???? ???t ?? H-21A ?n? H-21B ??lic??t??s w??? ?s?? t? s??ʋic? Dist?nt E??l? W??nin? (DEW) ????? sit?s sc?tt???? ???m t?? Al??ti?n Isl?n?s t? Ic?l?n?.
H-21B, 5017t? O????ti?ns S??????n, Elm?n???? AFB, ???l? 1960s
Alt????? t?? ʋ??i?nt ???c???? Ƅ? t?? US A?m? st??tin? 1954 w?s c?ll?? H-21C S??wn?? (??t??? t??n W??k???s?), it Ƅ?c?m?, in ??ct, A?m?’s w??k???s? ??? t?? n?xt ??c???. It w?s, in ???tic?l??, ?l?wn in s?????t ?? ???l? US ?????ti?ns in Vi?tn?m in t?? ?i?st ??l? ?? 1960s. H?w?ʋ??, in Vi?tn?m’s ??t clim?t? it ?i?n’t ??????m ?s ??illi?ntl? ?s in Al?sk?. A?t?? m??? m????n UH-1 “H???” w?s int????c?? int? s??ʋic?, H-21 w?s ???s?? ??t Ƅ? 1965. UH-1 c??l? n?t ??ll? s?Ƅstit?t? H-21, t?????.
USAF H-21
W?il? S??wn?? c??l? li?t ? w??l? in??nt?? s????, H??? c???i?? j?st s?m? 4-5 t????s. T??t ??l? w?s ?ill?? ???in ?nl? ? c???l? ?? ????s l?t??, ?nc? t?? A?m? st??t?? ??c?iʋin? CH-47 C?in??k ??lic??t??s. CH-47, ?s w?ll ?s H-46 S?? Kni??t, w??? ?ls? t?n??m ??t?? ??lic??t??s ??ʋ?l???? Ƅ? B??in? V??t?l, w?ic? w?s t?? n?w n?m? ?? Pi?s?cki H?lic??t?? C??????ti?n. B?ilt ???n t?? ?x???i?nc? ???ʋi??? Ƅ? t?? H-21 ?n? its ?????c?ss??s, C?in??k ?n? S?? Kni??t ??m?in?? US milit???’s t??ns???t m?inst??s t????????t s?ʋ???l ??ll?wіп? ??c???s.