skeg

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skeg

[skeg]
(naval architecture)
An extension of the stern end of the keel, which in some cases passes under the propeller and supports the rudder post.
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References in periodicals archive ?
These hyrda-lift skegs are actually a big change," Silverstein said.
For those looking for maximum performance from a cruising cat, daggerboards are a must as the yacht is far more manoeuvrable and much easier/quicker to tack than a cat with skegs (but there's nothing wrong with the latter--it comes down to individual needs).
We haven't had a chance to check out the underwater profile, but the rudders appeared pretty big for such a boat and Beneteau tell us that the skegs are comparatively short.