3 ms·
This is essentially what capsized the Saewol and killed hundreds of people. It can be detected with empirical tests however. Almost every ship should right it
by kwillets 9y ago
This is essentially what capsized the Saewol and killed hundreds of people.
It can be detected with empirical tests however. Almost every ship should right itself from a roll within ten seconds or so, so anyone with a stopwatch can detect misloading. There are monitors that measure this continuously as well.
At one point I was thinking of making a phone app for this, so that ferry passengers could check stability themselves.
- mordechai9000 9y agoJust to make sure I understand - are you saying that on a properly loaded ship, no more than ten seconds should pass between the deck going out of level and then returning to level? Does it matter if it's rolling side to side, or front to back?
- kwillets 9y agoSide-to-side. There's a certain design range where it's not too fast and not too slow, and some inspectors check for it. https://en.wikipedia.org/wiki/Metacentric_height#GM_and_rolling_period https://en.wikipedia.org/wiki/Metacentric_height#GM_and_roll... Also, there's random motion that may look like roll when it's the sea surface that's showing the motion, so there are methods to filter that out and extract the actual rolling period.