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In Technik Museum Speyer I have seen strange attachments to the keel of Rescue Ship John T. Essberger. What is their purpose? Are they anyhow related to hydrodynamics? They are quite small compared to the size of the ship.

strange attachments to the keel

banterCZ
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    They are sacrificial zinc anodes to prevent corrosion. Every boat has them, big metal boats may have several tons of them. – Phil Sweet Aug 20 '23 at 12:13
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    https://www.boatzincs.com/teardrop-8.html?gad=1&gclid=Cj0KCQjw84anBhCtARIsAISI-xfvns7cD0lOODq9hFoqcqU5tDoiMmbr2JVhej0_v7o2szgeGajaZQAaAiZMEALw_wcB – Phil Sweet Aug 20 '23 at 12:16
  • @PhilSweet Awesome! I suggest you make your comment into an answer. I will accept that as a solution. – banterCZ Aug 20 '23 at 14:44

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They are sacrificial zinc anodes to prevent corrosion. Every boat has them, big metal boats may have several tons of them. This type is a strap-on teardrop style.

Phil Sweet
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