Ko te Sikorsky H-19 Chickasaw (tauira kamupene S-55) he waka topatopa whai-maha i whakamahia e te US Army me USAF.
He mea hanga raihana ano e Westland Aircraft hei Westland Whirlwind i te United Kingdom.
Ko te whakawhanaketanga o te H-19 i timata takitahi e Sikorsky me te kore tautoko a te kawanatanga. I te tuatahi i hangaia te topatopa hei papa whakamatautau mo te maha o nga ariā hoahoa hou e kii ana kia nui ake te kaha ki te kawe kawenga me te ngawari o te tiaki.
Ko te kaihoko tuatahi ko te USAF, nana i whakahau kia rima nga rererangi YH-19 mo te aromatawai; te rere tuatahi a te YH-19 i te 10 o Noema 1949.
I whai muri mai i te tukunga o te YH-19 tuatahi ki te USAF i te 16 Paenga-whāwhā 1950 me te tuku i te waka topatopa HO4S-1 tuatahi ki te US Navy i te 31 o Akuhata 1950.