Snow Load Sinks Boats - Page 3 - SailNet Community
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post #21 of 38 Old 12-26-2008
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Here's another lesson, from a friend's marina nearby in Gibsons Landing..

From the email:

His keel housing has two bolts go through it to hold up the keel while trailering, they were not in. The heavy snow load lowered the boat till these bolt holes were below the water line, didn't take long, as they said it sank 12" in 15 minutes.

This boat has been refloated already - VERY LUCKY others were around when this happened!!



Ron

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post #22 of 38 Old 12-26-2008 Thread Starter
... a logical conclusion
 
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Yup, it's not necessarily the boat being pushed under; it's usually the boat being lowered to an overlooked 'weak link' like that.

Cheers,
Michael

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post #23 of 38 Old 12-26-2008
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Get a bigger sail boat .......problem resolved !
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post #24 of 38 Old 12-27-2008
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Not always problem solved, sometimes it just means more water to pump out.

Always surprised at how many boats you see that seem to have the bilge pumps constantly pumping, one near me has the pump cycle every ten minutes, and pumps for about 5 minutes each time. Very nice looking boat but seldom see anyone aboard to ask about it.

As for snow load, I just shoveled approximately 2ft of snow off my Ariel, I meant to get to it earlier but kept getting hung up. Luckily it's on the trailer in the yard so I don't have to worry about her sinking. Could tell from the 'spring' that there was a good heavy load there though. Before shoveling it felt rock solid, after shoveling I could feel the spring in the trailer.

Side note, my daughters porch roof collapsed about 4 hours ago from the snow load.

Ken
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post #25 of 38 Old 12-27-2008
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Could have waited on the shoveling, 50 degrees today *^&$%^ michigan weather anyway.

Ken.
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post #26 of 38 Old 12-27-2008
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Something no one's mentioned

The dink. Sequitur, you've got the dink on davits and filled with snow. Watch that. If you put too much load on that you could end up bending your davits. For instance, if the drain is not entirely clear, when that snow melts you will end up with a dink full of water, which is more dense than snow. Then it may freeze, and nothing good will come from that.

It doesn't look like your dink is covered, and it also appears you have her canted to her port side, which means the water won't drain even if you have the drain plug out.

Just flagging the issue. If you've got it under control, my apologies for meddling.

Dan Goldberg

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post #27 of 38 Old 12-27-2008
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I just wanted to send my sincere condolences to all you snowed in sailors. There's something just fundamentally wrong with that. Hang tough, brothers!
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post #28 of 38 Old 12-27-2008 Thread Starter
... a logical conclusion
 
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Quote:
Originally Posted by danielgoldberg View Post
The dink. Sequitur, you've got the dink on davits and filled with snow. Watch that. If you put too much load on that you could end up bending your davits. For instance, if the drain is not entirely clear, when that snow melts you will end up with a dink full of water, which is more dense than snow. Then it may freeze, and nothing good will come from that.

It doesn't look like your dink is covered, and it also appears you have her canted to her port side, which means the water won't drain even if you have the drain plug out.

Just flagging the issue. If you've got it under control, my apologies for meddling.
Daniel;

Thank you very much for your concern.

My dinghy, Non Sequitur is covered, and although the cover has sagged a bit, the dinghy's list to port is allowing melt water to run off. Also, when I hoist the dinghy, I always remove the plug and attach the end of the falls to its lanyard as a pre-launch reminder. I checked the drain when I was there the other day, and it was clear and dry.

Cheers,
Michael

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post #29 of 38 Old 12-28-2008
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I just had to jump in here.

I find it extremely hard to believe that you could pile enough snow on top of a well found sailboat to cause it to sink. After all there is already several thousand pounds of lead/iron hanging under it.

If it sinks it's because there is another problem that the owner failed to address and just got away with it until times got bad.


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post #30 of 38 Old 12-28-2008
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You've obviously never see how heavy snow can get, especially if there's a rain storm or freezing rain storm along with it or if it is the wet concrete type New England snow. A couple of feet of the wet-concrete type snow we get in New England can add enough weight to a boat to bring it down a few inches.

If the cockpit drains get clogged and the cockpit fills up with snow and ice, that can be a pretty significant amount of weight as well. Add to that a hose or two bursting from ice freezing in it... then you've got a pretty good recipe for sinking a boat.

BTW, to give you an idea of what the problem is... roofs in New England are often designed for 40-70 lbs. per sq. ft. of snow load. Even with that kind of rating, we've had roofs failing due to the weight of snow and ice this winter. 3-5" of old snow weighs about 5-6 lbs. per sq. foot. If the snow was wet to begin with, that can be off by a factor of two....

Using the base figures 3" of snow weighing 6 lbs. per sq. ft., with snow that is 15" deep, as was the case this past week in much of New England. You're looking at 30 lbs. per sq. ft of boat area..... probably more in the cockpit, since snow would tend to build up there due to drifiting... A 30' boat is usually about 11' wide... figure that the area of the boat is about 60% of the area of the rectangle, due to the shape of the boat. 30*11*.6=198 sq. ft. 198 sq. ft. * 30 lbs. of snow per sq. ft. = 5940 lbs. of snow.

The PPI rating of a Catalina 30 is about 1000 lbs. per inch. That means that this much snow would sink the boat SIX INCHES. How many boats do you know of that would be safe if they were sunk an additional six inches without any additional preparation.

In southern California, sailboats are regularly sunk by sealions and seals wanting to sun themselves on the boats...

Quote:
Originally Posted by DwayneSpeer View Post
I just had to jump in here.

I find it extremely hard to believe that you could pile enough snow on top of a well found sailboat to cause it to sink. After all there is already several thousand pounds of lead/iron hanging under it.

If it sinks it's because there is another problem that the owner failed to address and just got away with it until times got bad.



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