Jamesuk
Active member
A boat like a women can have that affect. Sometimes enough is enough! HEE HEE
Yacht hits container
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A boat like a women can have that affect. Sometimes enough is enough! HEE HEE
sighmoon
Active member
How can something float below the water? It's either denser than water and sinks, or less dense and floats. There would either be some of it above the water (not necessarily much), or the whole thing is on the sea bed. Strobes on the corners of the container would help retrieve containers, save sailors and cost very very little.
Hoolie
Well-known member
I think post #3 by Reverend Ludd might give a clue to that
alahol2
Well-known member
Solent coastguard were reporting a tree off Gurnard last Saturday. Anybody hit it?
Reverend Ludd
New member
rogerthebodger
Well-known member
Snap 2
johnphilip
Well-known member
Recycling benefit
I always assumed that large amounts of polystyrene packaging provided lost containers with their buoyancy. The move to cardboard and shredded paper should stop the longer term floatation of a 40' box.
I always assumed that large amounts of polystyrene packaging provided lost containers with their buoyancy. The move to cardboard and shredded paper should stop the longer term floatation of a 40' box.
Seagreen
New member
Surely a submerged container will be like an iceberg in that it either floats awash end-on up, or has neutral bouyancy just below the water.
So would'nt a forward facing echo sounder mounted low on the stem or keel facing forward, rigged to an alarm or autopilot work? I'm sure it could be rigged by someone with slight techie knowledge.
So would'nt a forward facing echo sounder mounted low on the stem or keel facing forward, rigged to an alarm or autopilot work? I'm sure it could be rigged by someone with slight techie knowledge.
JayBee
Member
I am sure a submariner will be along shortly to explain that the achievement of neutral buoyancy can be a desirable, but almost impossible, physical state.
Conachair
Guest
[27631]
N/A
containers.......
I gather that if containers come loose in bad weather and start to swing about bashing the side of the ship etc...the crew cut the chains holding them using oxy/acetylene or whatever...so they fall freely overboard...thus no longer causing the ship any structural danger...scary thought.Saw one once south of the I.of W. with just a few inches of it above the waves...obviously there was air trapped in the top foot or so above the doors...
I gather that if containers come loose in bad weather and start to swing about bashing the side of the ship etc...the crew cut the chains holding them using oxy/acetylene or whatever...so they fall freely overboard...thus no longer causing the ship any structural danger...scary thought.Saw one once south of the I.of W. with just a few inches of it above the waves...obviously there was air trapped in the top foot or so above the doors...
macd
Active member
I'm with Sighmoon and JayBee. "Floating just below the surface" is an oxymoron which would have Archimedes turning in his grave. As for post #3, it didn't describe something floating just below the surface but at it, which is where stuff floats. None of this, of course, renders buoyant containers harmless to shipping (assuming none are lighter than air).
Reverend Ludd
New member
The top corner was visible on the surface, attached to it, below the surface was the rest of the container. Call it what you will.
In fact can you describe what you would put in your ships log.
macd
Active member
I wasn't getting at you, padre, but at post #22 which seemed to me to claim something of your post #3 that it didn't actually say.
pohopetch
New member
The top metre or so of water is often quite a few degrees warmer than that lower down, and hence less dense. Something of around the same density as water may quite easily be too heavy to float at the surface but will float in the denser water a little lower down, with nothing showing above the surface. This is why it is quite common to find logs floating just 10 or 20cms below the water surface when sailing in British Columbia, Canada. As they become more and more waterlogged they slowly sink below the surface until they hit the very cold water a couple of metres down and sink straight to the bottom. This only happens with some types of wood that are not naturally super buoyant. We hit one - we know they do float just below the surface!
westernman
Well-known member
I have 5 compartments on my boat with watertight dividing doors. The forward part of the boat can be closed off. No way would she sink.
However she would be a bugger to steer with all that weight up forward. Could probably sail slowly down wind with just the jib and staysail up.
I can't help thinking that any kind of sailing boat weighing 10-30 tonnes running at several knots into the corner of a waterlogged container weighing 30 tonnes or so is going to be holed.
After all your average steel boat is less than 8mm thick and I would imagine that it will be opened up much like a tin can unless the boat is light enough to bounce off it.
Not that anything else stands much chance either......
However she would be a bugger to steer with all that weight up forward. Could probably sail slowly down wind with just the jib and staysail up.
I can't help thinking that any kind of sailing boat weighing 10-30 tonnes running at several knots into the corner of a waterlogged container weighing 30 tonnes or so is going to be holed.
After all your average steel boat is less than 8mm thick and I would imagine that it will be opened up much like a tin can unless the boat is light enough to bounce off it.
Not that anything else stands much chance either......
macd
Active member
...and conversely, especially in the winter months: the top metre or so of water is often quite a few degrees colder than that lower down, and hence less dense.
Hoolie
Well-known member
Titanic comes to mind ... ... ...
Hoolie
Well-known member
Quite some years ago I was involved with a US sidewall hovercraft programme. But it came to nought because of exactly this problem. "Deadheads" were undetectable however sophisticated the radar or other sensors.
D
Deleted member 36384
Guest
Perhaps. From reading Total Loss (hardly the definitive source of information) most collisions that result in water ingress are associated with keel, rudder, skeg and hull damage i.e. anywhere except the forward area to the bow.
The family crewed yacht that sunk in the South Atlantic after hitting a growler had a leak in her water tight compartment at the stern. She settled with her decks awash for a while before sinking IIRC.
A yacht with a collision bulkhead may just end up floating bow up or stern up with the hulk being completely uninhabitable from a survival point of view. Perhaps buying time as opposed to saving the vessel is really the purpose that such bulkheads serve.