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Old 10-11-2010
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St Anna St Anna is offline
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Tide against wind cause the yacht to lie beam on to the swell at anchor. Methods to minimise this are as said earlier, but also include the type of keel - a small thin fin will cause a more jerky motion than a fuller keel. The beam of the boat will also play a part - but more so if the widest part is right at the stern. These 'bendy types' have a flat hull section aft of the small bolt on keel. The keel resistance is concentrated in a small area as opposed to a fuller type of keel.

A few months ago we were stuck in an anchorage which was very rolly [for about 10 days]. A 50' beneteau anchored close to us (too close - another story). As I spent a good deal of time watching this neighbor, I concluded that he rolled much more than we did. I even got to see his keel. His 'roll' was very jerky and althoughs ours was a PITA, I would hate to spend a night on our neighbors beneteau.

There are ways to minimise/reduce/eliminate ' roll' at anchor such as 'flopper stoppers, or a split snubber. We sometimes drag a small drogue to keep the bow into the tide flow

You mentioned a catamaran - I am biased but they can tend to have a 'washing machine' [some say seasick producing] like motion which is very unlike the smooth predictable motion of a yacht under sail. Go for a sail in a cat in some reasonable breeze and seas before you believe all the hype.

have a look at our 'sailing cat' Even she looks under the weather!
http://i665.photobucket.com/albums/v...a/P8030021.jpg
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