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Da bi se energija proizvedena u poganskom uređejuna brodu transformisala u porivnu silu, , nophodno jeda na brodu postoji propulzor.U ranim fazama primjene parne mašine na brodu jekao propulzor upotrebljavan, točak, koji je kasnijezamjenjen propelerom, prvenstveno zbog većegegstepena korisnosti koji propeler ima u odnosu natočak.39

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