Water can enter through even the smallest cracks, but how do you avoid water entering ships at the propeller shafts. I mean…seals in general, must fit tight, but here you still have to allow for movement. How do they do it?
In: Engineering
They use a “Garloc” seal. It’s a lubricated seal that encircles a polished part of the shaft. The inner lip of the seal has a spring providing constant tension and the seal material is very hard and long-wearing. Some are even made of a graphite impregnated material to improve lubricious and wear properties. They are also packed on either side, often with a wax/grease impregnated fibrous material.
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