Sageli muutuva käigurežiimiga laevadel on kasulik rakendada keeruka ehitusega ja kalleid reguleeritava sammuga sõukruve. Nendega saab muuta laeva sõidukiirust, muutmata peamasina pöörlemissagedust, ning anda tagasikäiku, vajamata muud reversiivseadet.
... indicators shall be fitted on the navigating bridge for:
.1 propeller speed and direction of rotation in the case of fixed pitch propellers;
.2 propeller speed and pitch position in the case of controllable pitch propellers;
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