Is a ship moving slower more stable at sea? For example; if a ship is doing 10 knots in 1 meter seas, is it more stable than a ship doing 15 knots?
In 1 mtr seas it would depend on the size of the ship
As the ship goes faster the bow wave increases so the Stearn has less water around it, go to fast in heavy weather and you get air under the ship and the propulsion system turns to fast could result in a lot of damage. The irregularities of the waves makes the ship pitch and roll the faster you go the more this becomes evident, it can become very alarming
I'd think a cruise ship has to maintain a certain speed such the waves do not cause it to roll more then it should.
Both the Oasis of the Sea and the QM2 are built to push through and both would reduce speeds to I believe around 10-15 knots from 22-30. They each have a bulb extender that is designed to cut through wave action to the sides and also would open up their stablizers so passengers have an easy roll of it.
Interesting enough the recent voyage of QM2 from Quebec back to New Your was in Force 5+ waves and it continued but two crusie ships not built to that level had to return
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We had bad weather forecast after we were due to leave Jamaica, I'm sure the Captain said it was better to stay overnight in Jam. because the overnight trip was to somewhere close like G.Cayman & we would have to go so slow it wouldn't be safe, better to leave next morning & put his foot down.
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