Containers overboard

[AntarcticPilot]

In particle physics (IIRC from 50+ years ago) there is a concept of a nucleus cross-section within which a travelling sub-atomic particle may intercept the nucleus. With extreme exaggeration the unit is called the "barn". wikipedia/Barn_(unit)

There must be a similar cross-section in the sea that a yacht may collide with a floating object. This will be of the order of 10m wide or less. So to sail through 120,000 sq km of sea you would have to have a track of 12,000,000 miles I think - but please check!

The statistical question of the number of objects of a population that you will encounter on a particular track is one of great interest to the Whale and cetacean community when trying to estimate the size of the population of a particular species of whale or dolphin. Unfortunately, there isn't a really good statistical answer, which explains why you see vastly varying estimates of the size of the population of the various cetacean species as the assumptions you make change the answer a lot. There are also issues such as the distribution being patchy, which is an issue for containers too - a single incident might dump a hundred containers in one bit of sea, and of course, container ships follow well marked sea-lanes.

 

[PhillM]

Thread drift, but I was wondering how expensive it would be to create a flat-pack container so that after ht has arrived here, it could be dismantled and several put into a single container, to be shipped back to china and, re-assembled and refilled with the next cargo.

 

[penberth3]

Thread drift, but I was wondering how expensive it would be to create a flat-pack container so that after ht has arrived here, it could be dismantled and several put into a single container, to be shipped back to china and, re-assembled and refilled with the next cargo.

Already exist but light duty timber panels. Can't carry much weight and not strong enough for the handling and stacking they would experience in shipping. No question the present ISO is the optimum design.

 

[capnsensible]

I've read in some of the scientific reports on parametric rolling that speeding up can also reduce the roll. I think it is to do with breaking the synchronisation with the wave train.
Stories like this make you realise how different it is when a big ship gets heeled over, compared to a small yacht getting a bit tippy.

Drifting slightly (!) It is necessary for a submarine to turn beam to sea when diving and surfacing. Modern large submarines take some time to do this which can, on occasion, make life a tad sporting.

Quite how those guys put up with bad weather on wartime patrols is amazing.

 

[newtothis]

Already exist but light duty timber panels. Can't carry much weight and not strong enough for the handling and stacking they would experience in shipping. No question the present ISO is the optimum design.

There are several options out there, but none have taken off. I can't see the benefit to be honest, except in extreme situations. You've got so many ships running backhaul with virtually nothing on board so space for empties is not usually an issue.

 

[Blueboatman]

Tracker beacons eventually maybe ?

 

[Fr J Hackett]

Drifting slightly (!) It is necessary for a submarine to turn beam to sea when diving and surfacing. Modern large submarines take some time to do this which can, on occasion, make life a tad sporting.

Quite how those guys put up with bad weather on wartime patrols is amazing.

Why?

 

[capnsensible]

Why?

To properly vent the air from the ballast tanks and keep the propulsor under the surface.

 

[Kukri]

To properly vent the air from the ballast tanks and keep the propulsor under the surface.

Back to you: Appreciate the comments from you guys in the business, really promotes understanding,ta.

 

[newtothis]

Tracker beacons eventually maybe ?

One of the big carriers is in the process of putting trackers on all of its boxes. This is not being done for the ones that go awol, but for more prosaic logistics management reasons, but may also lead to lost boxes being spotted.
On the other hand, while it might happen in busy coastal waters, I'm not so sure anyone is going to send a salvage tug out to the mid-Pacific to pick up floating boxes.

 

[Daydream believer]

I would have thought that for the vast majority of yachts, most being within 100 miles of land, that up to 50 miles the bigger danger would be near estuaries, particularly after flooding, whereby large trees & other lumber are swept out to sea. Plus, of course clouting a whale having a kip & not hearing you coming. They might get a bit upset.
As a boy I can recall the wood on the beach round the mouth of the River Tweed after a heavy rainfall in the hills . It shows how much is dragged out to sea. Big rivers may well discharge larger trees.

 

[AntarcticPilot]

I would have thought that for the vast majority of yachts, most being within 100 miles of land, that up to 50 miles the bigger danger would be near estuaries, particularly after flooding, whereby large trees & other lumber are swept out to sea. Plus, of course clouting a whale having a kip & not hearing you coming. They might get a bit upset.
As a boy I can recall the wood on the beach round the mouth of the River Tweed after a heavy rainfall in the hills . It shows how much is dragged out to sea. Big rivers may well discharge larger trees.

Indeed. The only time I've hit anything in the water was in Whitby harbour - a lump of tree carried down by the River Esk! Fortunately, no harm done in the long run.

 

[AntarcticPilot]

To properly vent the air from the ballast tanks and keep the propulsor under the surface.

What happens if you need to get down fast?

 

[KevinV]

What happens if you need to get down fast?

You tell the young lady to brace?

 

[capnsensible]

What happens if you need to get down fast?

Those days are gone. The requirement to crash dive has lapsed with tha advent of submarines that can remain dived for extended periods.

 

[AntarcticPilot]

Those days are gone. The requirement to crash dive has lapsed with tha advent of submarines that can remain dived for extended periods.

I wondered if that was it. After all, it's quite a while since the first submerged circumnavigation

 

[Kukri]

I wondered if that was it. After all, it's quite a while since the first submerged circumnavigation

… in the course of which they popped up to periscope depth next to an extremely surprised Filipino fisherman. They were following Magellan’s route, and needed a position check.

 

[Daydream believer]

… in the course of which they popped up to periscope depth next to an extremely surprised Filipino fisherman. They were following Magellan’s route, and needed a position check.

Did the Filipino Fisherman tell them? Only I did not see the skipper comment on the thread, a couple of weeks ago, about the last time anyone used DR for position fix. At least, no one suggested that they had asked a Filipino Fisherman the way . Perhaps they were too embarrassed to tell us.
Probably not in the RYA YM exam any more

 

[capnsensible]

I wondered if that was it. After all, it's quite a while since the first submerged circumnavigation

That's a good read.

 

[Kukri]

Did the Filipino Fisherman tell them? Only I did not see the skipper comment on the thread, a couple of weeks ago, about the last time anyone used DR for position fix. At least, no one suggested that they had asked a Filipino Fisherman the way . Perhaps they were too embarrassed to tell us.
Probably not in the RYA YM exam any more

They didn’t surface; that was against the rules. What they wanted to do was to sight the memorial to Magellan on Mactan Island through a periscope.

As they came to periscope depth and put the periscope up, they saw the 19 year old Rufino Baring of Mactan Island in his banca. So they took his picture, and later that year “National Geographic” found him and interviewed him. He had not unreasonably assumed that what he saw was a sea monster: