Harbor tugs are more commonly equipped with these: https://en.wikipedia.org/wiki... | Hacker News

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gebruikersnaam on March 24, 2021 | parent | context | favorite | on: Suez canal blocked by a massive ship

Harbor tugs are more commonly equipped with these: https://en.wikipedia.org/wiki/Voith_Schneider_Propeller

They're quite efficient (although maybe only for lower speeds) and provide extreme maneuverability.

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