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Old 12-18-2009, 01:42 PM   #15
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Hi Everyone,

Atavist, you thought you had problems.

I've just purchased a steel, 36' Boden bilge keeler from Bundaberg in Queensland, Australia. Upon arrival at our first anchorage off Fraser Island on the way back to Brisbane we dropped anchor and my mate decided to charge up his mobile/cell phone from the plug on the power board. All of a sudden there's smoke snaking out from behind the power board. Sheer panic has by this time set in. Fire extinguishers broken out. Power board opened up and smouldering wire's melting insulation snubbed out. (I had noticed this one short loose wire behind the board upon first inspection and didn't think much of it at the time.) No worries. No more smoke. No obvious fire. Loose wire disconnected and removed. What it's purpose ever was, who knows?

Then the noise. Did we have cables smouldering somewhere behind the panels? No smoke. No smell. A few minutes of panic and urgent removal of access panels until I remembered that I'd heard the same noise on a 100' aluminium hulled schooner I'd sailed on. Not something you need to hear on your first night out on a new boat never the less.

All these years no one has ever been able to explain the noise. Now I know.

Atavist, we need not have worried after all!!

Cheers
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Old 12-18-2009, 02:17 PM   #16
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...no Snaps, Cracles and Pop in the North Sea or Baltic.

But when sailing in Portugal and Atlantic Spain (Bay of Cadiz) we noticed these noises too. They could be best heard when sticking the ear in the bilge of our fibreglass boat.*

Locals said fish do it but we never found out who in particular is responsibe.

And the Snap, Crackle and Pop is only present at anchor or sometimes in marinas, but never at sea over deep water.



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Old 12-23-2009, 08:33 PM   #17
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Worried me the first night (Matlacha FL.) The next day I saw them in the bait shop. Whew!
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Old 12-31-2009, 12:27 AM   #18
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Snapping shrimp are just about everywhere save the permanently icy bits of the world. I was asked this question just a few weeks ago by another long term cruiser, who noted hearing them just about wherever he went but never knew what they were. If you want to hear them out in the open during the day go walk near some mud flats at low tide- on a quiet day you can hear the action as these little guys use an acoustic 'gun' to stun their prey. One of the weird sounds and things that got me into marine biology in the first place!
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Old 01-12-2010, 01:22 AM   #19
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I just got back from the BVIs and heard the Snap, Crackle and Pop 3 nights out of 11, including the first night at the charter base. I'm glad I had read this post or I might have been concerned. Thanks everyone for your input.
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Old 01-12-2010, 01:28 PM   #20
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The snap, crackle, pop has stopped here in Stuart with the cold snap. I'm guessing all the critters ran for cover... if not they would probably be floating belly up with the fish that are littering the bay right now.
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Old 01-12-2010, 02:10 PM   #21
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I'm wintering in a marina here in Portugal and because of the prolonged periods of very heavy rain lately, the water in the marina and river is pale brown from the run-off from the surrounding land. A couple of evenings ago there was a loud "Thump" on the hull, so loud that I went on deck to investigate.

Flopping about in the water alongside was a fish about 12 to 14 inches long, one of it's eyes looked to be damaged and the fish appeared to have lost it's ability to get below the surface. It eventually struggled away out of sight under the pontoon.

There are Cormorants which often hunt in the marina and I wonder if the poor old fish had been chased, and in the murky water had swum at full speed into my hull. And yes, the shrimps chorus hasn't been heard here since the colder weather set in and the water turned coffee colour from the rain.
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Old 01-12-2010, 07:01 PM   #22
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My sister in law just visited us for New Years. We gave her the most comfy bed on the boat--giving up our stateroom so that she would have comfort and privacy, we slept in the less private double berth that resides under a fold-up seat in our chart house.

The next morning we talked about this thread and the little snap, crackle, poppers....she started laughing. She said that she heard them loud and clear and wondered if we had given her the "noisy" stateroom! She also was worried that something was eating the hull!
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Old 01-12-2010, 09:32 PM   #23
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This is a good story Brenda. I have a similar one.

My college roommate visited my on my boat. We were anchored off in the lovely cove of Ermioni and it was perfectly calm. The sea was a mirror.

Next morning I asked my friend how he slept. He said that he had trouble sleeping because snap & cracking noise. He said he thought it was made by little fish eating away the hull!!

Happy New Year

Vasilis
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Old 01-24-2010, 08:15 AM   #24
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Here is an other slant to this story: depending on water and air temperature differences ( that's my theory), fiberglass will move causing a crackling noise. I have experienced this on a number of boats in the Caribbean and the the east coast of Australia for tooo many years!
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Old 01-25-2010, 04:29 PM   #25
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Quote:
Originally Posted by capdiy View Post
Here is an other slant to this story: depending on water and air temperature differences ( that's my theory), fiberglass will move causing a crackling noise. I have experienced this on a number of boats in the Caribbean and the the east coast of Australia for tooo many years!
...if that is the case, I'd be highly whorried!! Fiberglass= glass fibres embedded in *hardened resin, and both components are highly connected to each other. If not, we talk about delamination: the fibres loosing contact to the resin and they can start to move..., the material (and therfore the hulls structure) becomes soft and very flexible. *But you are right when talking about decks and when they are not constructed as a sandwich: walking on deck produces a crackling noise and the older (and softer) a deck, the more it crackles. Delamination at work? *But this is a different topic and maybe a new thread.

Back to the Snap, Crackle, Pop made by sea creatures: *When living on board way back in the early 90ies (European Atlantic Coast, Caribbean and Atlantic Islands) we NEVER heard it. In partially the same waters on the same boat in 2003/04 we found it nerve wrecking loud at times! Did the species that produces the noise grow in population or* spread into new habitat, or didn't we notice back then?

Uwe

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Old 01-25-2010, 06:14 PM   #26
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The "snap, crackle & pop" happens under steel boats as well.
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