In article , Edgar wrote:
For shallow water I think that a centreboard is best if you want a boat that
can go well to windward when there is sufficient depth and yet go into
shallow water with the keel up.
I don't understand your preference for swing keel in shallow water, unless
we are not talking about the same thing. To me, a swing keel is what the
deep ocean racers have, with a heavy bulb at the bottom that can be swung to
one side to provide better stiffness on a long tack. In restricted shallow
water that would be useless since when you tack there would be insufficient
water to swing the keel down and hoist it up the other side.

I think you'll find that is called "canting". Swing tends to be in a
fore-aft direction; forward is down, wind the rope/cable and it rise
aftward into a casing.

Justin.

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Justin C, by the sea.