Sink?

Lazy Daze said:

FYI... the reason for the USCG requirement to seal any intrusions into the cabin area is to keep engine fumes and CO out of a sleeping area.

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hpcrank said:

Greetings

Just a thought, most how - to articles as well as vendors info., etc. say that the engine well must be sealed off from the cabin part of the boat so any wires or pipes, etc. that pass thru the firewall must also be sealed. If the engine well is sealed off from the remainder of the boat as the USCG requires and given that nearly all the under the water line thru hulls are in the sealed engine well, how could the boat sink?

hpcrank

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Stee6043 said:

Are you sure this "sealing" item is a real requirement? On my 340 I was able to very easily fish two sets of 4 gauge wire from the engine room up to the helm through existing wireways below the gunnels, above the fuel tanks. There was nothing remotely "water tight" about it....it wasn't even challenging...

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Lazy Daze said:

The requirement deals with the cabin, not the cockpit.

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Stee6043 said:

Are you sure this "sealing" item is a real requirement? On my 340 I was able to very easily fish two sets of 4 gauge wire from the engine room up to the helm through existing wireways below the gunnels, above the fuel tanks. There was nothing remotely "water tight" about it....it wasn't even challenging...

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Lazy Daze said:

In reality, water will find it's way into the cabin in some way, shape or form. But let's say, for sake of argument, that a cabin area was 100% sealed from the engine area. The bilge is a HUGE area. Water weighs over 60lbs for every 1 cubic foot - think about that for a sec - a box just 12"x12"x12" weighs over 60lbs. Now, imagine how many of those little boxes could fit down in that bilge. I don't even know how many... but I bet it is literally AT LEAST a ton's worth of boxes.

Let's also eliminate the various "level floatation" or "positive floatation" criteria that certain size/classifications of boats are require to have.

As the water keeps pouring in, the stern of the boat gets heavier and heavier, with the bow starting to lift. As that happens, the boat gets less buoyant and the stern end sinks faster and faster since the stern end of a boat will not displace as much water as the entire length of the hull. Really, there's two things going on there (and probably more that my feeble mind is not aware of)... increased weight and less displacement. So, to answer your question of "How would the boat sink"... Ass-end first.

FYI... the reason for the USCG requirement to seal any intrusions into the cabin area is to keep engine fumes and CO out of a sleeping area.

Click to expand...

Lazy Daze said:

One factory worker to another over lunch break: "Oh, is THAT what I was supposed to use that silicone for"?

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Lazy Daze said:

In reality, water will find it's way into the cabin in some way, shape or form. But let's say, for sake of argument, that a cabin area was 100% sealed from the engine area. The bilge is a HUGE area. Water weighs over 60lbs for every 1 cubic foot - think about that for a sec - a box just 12"x12"x12" weighs over 60lbs. Now, imagine how many of those little boxes could fit down in that bilge. I don't even know how many... but I bet it is literally AT LEAST a ton's worth of boxes.

Let's also eliminate the various "level floatation" or "positive floatation" criteria that certain size/classifications of boats are require to have.

As the water keeps pouring in, the stern of the boat gets heavier and heavier, with the bow starting to lift. As that happens, the boat gets less buoyant and the stern end sinks faster and faster since the stern end of a boat will not displace as much water as the entire length of the hull. Really, there's two things going on there (and probably more that my feeble mind is not aware of)... increased weight and less displacement. So, to answer your question of "How would the boat sink"... Ass-end first.

FYI... the reason for the USCG requirement to seal any intrusions into the cabin area is to keep engine fumes and CO out of a sleeping area.

Click to expand...

Lazy Daze said:

In reality, water will find it's way into the cabin in some way, shape or form. But let's say, for sake of argument, that a cabin area was 100% sealed from the engine area. The bilge is a HUGE area. Water weighs over 60lbs for every 1 cubic foot - think about that for a sec - a box just 12"x12"x12" weighs over 60lbs. Now, imagine how many of those little boxes could fit down in that bilge. I don't even know how many... but I bet it is literally AT LEAST a ton's worth of boxes.

Let's also eliminate the various "level floatation" or "positive floatation" criteria that certain size/classifications of boats are require to have.

As the water keeps pouring in, the stern of the boat gets heavier and heavier, with the bow starting to lift. As that happens, the boat gets less buoyant and the stern end sinks faster and faster since the stern end of a boat will not displace as much water as the entire length of the hull. Really, there's two things going on there (and probably more that my feeble mind is not aware of)... increased weight and less displacement. So, to answer your question of "How would the boat sink"... Ass-end first.

FYI... the reason for the USCG requirement to seal any intrusions into the cabin area is to keep engine fumes and CO out of a sleeping area.[/QUOT

I see your point (or would that be bow?). The ass end assumption would be logical up to some bilge volume vs. remaining displacement and hull weight vs. lots of other variables. Guess an engine compartment filled with water would be a good way to check to see if the compartment has any passages thru the cabin bulkhead!

hpcrank

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