Loud Crack Sound at Night - SailNet Community
 
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post #1 of 8 Old 07-17-2009 Thread Starter
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Loud Crack Sound at Night

Hi all,
I was wondering if this sound I hear in the evenings is normal. I live on a wood/epoxy/glass composite sailboat with a fiberglass deck in Seattle, and nearly every night I'll hear a single loud crack coming from the direction of either the deck, the side hull, or the window housing (it's a single large sheet of poly-something adhered and bolted in place).

My guess is that it has to do with the expansion and contraction of one of these components as the day cools off, but it's loud enough to be startling and a little worrisome. Do other folks experience this? Should I worry about the wood cracking or some other kind of separation taking place?

Thanks,
Jeff
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post #2 of 8 Old 07-17-2009
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post #3 of 8 Old 07-17-2009
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Quote:
Originally Posted by JeffBurright View Post
nearly every night I'll hear a single loud crack coming from the direction of either the deck, the side hull, or the window housing
Jeff,

I sail a fiberglas boat slathered with mahogany in its innards and (unfortunately) teak on the deck. Occasionally I hear a similar, "pop" that is the difference in expansion, or contraction between the dissimilar materials. Unless the "pop" precedes a frantic bilge pump, I'll bet your noise is from similar source.

Wayne
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post #4 of 8 Old 07-17-2009
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The dreaded pistol shrimp again!!! But only one this time.

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post #5 of 8 Old 07-17-2009 Thread Starter
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Oh Jeez, I had to wiki the pistol shrimp. Thanks for the new nightmares.
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post #6 of 8 Old 07-17-2009
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Have you looked at the you tube video?

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post #7 of 8 Old 07-18-2009
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Shrimp that "pack heat," one could say

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post #8 of 8 Old 07-18-2009
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My guess would be the window housing you mention. A large sheet can expand and contract quite a bit over the temperature change between night and day. If its bolted on, it could be that there is not enough flexibility in its mounting and that is causing the sound. Are there any cracks?
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