Fin

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Added bits 11:

"keel" is a misnomer; foil or fin might be better. Could instead be a centreboard or daggerboard. Differentiate keelboats from centreboarders.

Centreboard retracts if it hits an obstacle, unlike a daggerboard. When centreboard is retracted, centre of lateral resistance moves backwards, changing ?balance? (c.f. daggerboard which can be retracted ?without? moving CLR - or just less movement since effect of daggerboard is diminished & there are still effects of rest of hull)

leeboard: centreboard attached to the side of the boat.

keel

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