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Go Back   SailNet Community > General Interest > General Discussion (sailing related) > How does a boat sink in 15 minutes?
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Thread: How does a boat sink in 15 minutes? Reply to Thread
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Topic Review (Newest First)
10-23-2012 06:54 AM
dmchose
Re: How does a boat sink in 15 minutes?

Watched a 128 foot tug we were salvaging sink in about a " very looong 60 sec.". Well kinda watched. I was actually running as fast as I could away from the mooring wall still in a dry suit. It is a very violent and fast affair. If anyone was on board there would have been no way to get off it. Stern bobbed twice and bow rose, whole tug twisted as much as the 3 inch hawsers would allow. Tug became vertical and then was gone.
Bow and stern lines snapped and spring lines became guitar strings melded into a hazard that took a whole shift before management came up with an idea how to break them without breaking anyone in the process.
10-23-2012 03:53 AM
Omatako
Re: How does a boat sink in 15 minutes?

Break the keel off a sailboat and leave a 10 inch wide by 5 foot long hole in the bottom of the boat.

The boat sinks in 15 seconds, the other 14 minutes and 45 seconds you float in the water (assuming you weren't down below when it happened) and wonder what happened.

How do I know this? I'm not answering that but . . . .



That used to have a keel attached to it.
10-22-2012 01:37 PM
Daydreamer22
Re: How does a boat sink in 15 minutes?

Back in the 90s I had a 19 foot jet boat with through transom exhaust. A short section of rubber hose connected the exhaust manifolds to the transom fittings and had rotted from the inside.

Launched the boat and sped off across a lake. Within five minutes we had water up to the seats and coming in faster than the bilge pump could handle it. Immediately turned for shore and beached the boat.

Any further out, or if the engine had stalled the boat would have been lost well within 15 minutes. Don't know the exact volume, but the cooling system moves a lot of water.
10-22-2012 01:09 PM
kjretlaw
Re: How does a boat sink in 15 minutes?

An Outdrive failure can sink the boat in minutes. Think about a 4 inch rip letting in water. I watched one go down in less than 5 minutes.

Sad they lost the boat glad they were prepared, it saved thier lives.
10-22-2012 11:14 AM
RobGallagher
Re: How does a boat sink in 15 minutes?

Quote:
Originally Posted by MikoBee View Post
Also, the article called it both a dinghy and a liferaft. I'm not sure if the video had more information (won't play for me), but a dinghy wouldn't be unusual.
At the end of the video the camera pans to the "dinghy" sitting on the dock. It was definitely a life raft. The rescue patrol officer refered to it as a dinghy during the interview so I guess the news parroted that information.
10-22-2012 08:28 AM
Minnewaska
Re: How does a boat sink in 15 minutes?

I've seen this posted here before. Here is one that went down in 120 seconds. Read the first article.

The Marine Installer's Rant: One hundred and twenty seconds
10-22-2012 07:57 AM
MikoBee
Re: How does a boat sink in 15 minutes?

Quote:
Originally Posted by RobGallagher View Post
Not when you pay attention to the water temp. Without the raft they might be dead. When the water temp. is that cold it's good to have a plan B.
Also, the article called it both a dinghy and a liferaft. I'm not sure if the video had more information (won't play for me), but a dinghy wouldn't be unusual.
10-22-2012 04:35 AM
Zanshin
Re: How does a boat sink in 15 minutes?

A 2" diameter hole 1 foot underneath the waterline will let in 78 gallons per minute. If the bilge pump can't handle that, then the second minute the hole will be 2 feet underneath the waterline and let in commensurately more water.

78 Gallons is about 650 Lbs, a typical boat won't stand that much weight being added per minute for very long...
10-22-2012 03:18 AM
RobGallagher
Re: How does a boat sink in 15 minutes?

Quote:
Originally Posted by Ninefingers View Post
When you watch the clip, it makes you wonder. I don't know of too many people who carry a liferaft on a lake. Aw damn, I'm starting one of those speculation threads, noooooo!
Not when you pay attention to the water temp. Without the raft they might be dead. When the water temp. is that cold it's good to have a plan B.
10-22-2012 12:43 AM
overbored
Re: How does a boat sink in 15 minutes?

happy story, the boaters are OK and there is one less bayliner on the water
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