Unsinkable

[somedayy]

[QUOTE=Stumble;1394557]It may be possible to destroy one, but a lot of multihulls actually are unsinkable. They are built with foam cores, and the hulls themselves actually weigh less than the water they displace.

Just like the reason ALL boats float. Look up Archimedes principle.

[Stumble]

[QUOTE=somedayy;1397152]

Originally Posted by Stumble

It may be possible to destroy one, but a lot of multihulls actually are unsinkable. They are built with foam cores, and the hulls themselves actually weigh less than the water they displace.

Just like the reason ALL boats float. Look up Archimedes principle.

No, most boats displace as much water as they weigh when not full of water. While many multihulls displace as much water as they weigh when full of water.

It why a pound of styrofoam floats while a pound of lead doesn't.

[Factor]

Originally Posted by DotDun

It's called survival. If you believe all catastrophic failures happen with the sea conditions as shown in the picture, you're living in a fantasy world. I'm proposing 50kt wind and 30' seas. I'll take my life raft, I suggest you install seat belts on your salon roof. They'll find my plb as it's high and dry with me in the life raft.

Its not one or the other you know. Surely its good to have both. Surely if you had a boat that was "swamped" it is still good to be near it in your life raft? I am not sure why it is important to ignore it all together. All of the poeple who have been "over" for example talk about the usefulness of getting back in the boat to get food water - other supplies?

And if you have ever spent any time in life rafts( I have) then you will know they are not a fun place to be.

[44'cruisingcat]

Originally Posted by DotDun

It's called survival. If you believe all catastrophic failures happen with the sea conditions as shown in the picture, you're living in a fantasy world. I'm proposing 50kt wind and 30' seas. I'll take my life raft, I suggest you install seat belts on your salon roof.

They'll find my plb as it's high and dry with me in the life raft.

High and dry in a liferaft? It's patently obvious you've never been in one.

[tamicatana]

People, have you read these books?

Nalepka, James. Capsized: The true story of four men adrift for 119 days.

Glennie, John. The Spirit of Rose-Noelle: 119 days adrift: a survival story.


Two differing views of the same capsize of a trimaran off NZ. Worth your time.

[Sailor_Hutch]

I understand the idea that the cat may be a better survival platform. But - are they any easier to salvage? Seems like many cats are left adrift the same way as other types of disabled vessels ... which is such an incredible waste. Are the maritime salvage laws to blame?

[valhalla360]

Originally Posted by Sailor_Hutch

I understand the idea that the cat may be a better survival platform. But - are they any easier to salvage? Seems like many cats are left adrift the same way as other types of disabled vessels ... which is such an incredible waste. Are the maritime salvage laws to blame?

It's a lot easier to tow a half sumberged cat into a hoist slip and pull her out than to search for a mono in 100 fathoms, dive down and bring her to the surface.

[Cotemar]

Originally Posted by Sailor_Hutch

I understand the idea that the cat may be a better survival platform. But - are they any easier to salvage? Seems like many cats are left adrift the same way as other types of disabled vessels ... which is such an incredible waste. Are the maritime salvage laws to blame?

Catamarans are easily salvaged since they are still floating and not 100 feet down on the sea floor.
The problem and expense is paying a plane to fly a grid pattern over a large part of the ocean where you believe the catamaran is drifting a week after the accident.

[Sailor_Hutch]

Originally Posted by Cotemar

Catamarans are easily salvaged since they are still floating and not 100 feet down on the sea floor.
The problem and expense is paying a plane to fly a grid pattern over a large part of the ocean where you believe the catamaran is drifting a week after the accident.

Yes. That sounds like a financial factor that may be more to blame for the forgotten wrecks than any salvors encumbrances. There has got to be a big opportunity/profit in there someplace ... something like an epirb, except commercial in nature, and that lasts for months ...

The traffic load for such a system could be very low ... requiring only a few blips per day to point closely enough to the boat.

[marvinmartian]

I get the impression that some here have not heard about, let alone parsed, this thread.

http://www.cruisersforum.com/forums/...unk-50874.html

[Stumble]

Originally Posted by marvinmartian

I get the impression that some here have not heard about, let alone parsed, this thread.

http://www.cruisersforum.com/forums/...unk-50874.html

You mean the cat that lost its sail drive, then didn't sink? Nope missed that one.

[markpierce]

So, do ocean-going sailors on unsinkable boats bother carrying a life raft?

[Factor]

Originally Posted by marvinmartian

I get the impression that some here have not heard about, let alone parsed, this thread.

http://www.cruisersforum.com/forums/...unk-50874.html

HMMM. No one has said that they CANT sink, just that they can be designed and built to prevent that and whilst some might sink, others will not.

[Cotemar]

Originally Posted by markpierce

So, do ocean-going sailors on unsinkable boats bother carrying a life raft?

Yes, a life raft is still needed in case of fire

[marvinmartian]

Originally Posted by Stumble

You mean the cat that lost its sail drive, then didn't sink? Nope missed that one.

The only reason it didn't sink was because it hit the bottom. She would have sank all the way if the capt. hadn't intentionally grounded her. The boat did not have enough positive buoyancy to remain afloat after the engine compartment flooded and then leaked into the adjacent compartments.

The story is quite clear on that as is the thread.

Cats can sink.