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Old 10-03-2012, 03:04 PM   #21
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I own a moisture meter...and although I won't agree with the term "crapshoot" it certainly takes some practise and the results are not always absolute. This is my experience and I am only a novice.
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Old 10-03-2012, 03:09 PM   #22
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Rick,
Can you imagine $18.00 in 1900. For an Electric belt

You could probably buy a good horse and saddle for that back then.

Great for a good laugh.

Sd
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Old 10-03-2012, 03:16 PM   #23
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Quote:
Originally Posted by jleonard View Post
I own a moisture meter...and although I won't agree with the term "crapshoot" it certainly takes some practise and the results are not always absolute. This is my experience and I am only a novice.
I think the issue is not whether a moisture meter will detect moisture...it will do that to the degree of competence of the user...it's what the state of the hull is in "with" moisture present....that's what the meter can't tell you...and what I have come to believe from extensive research is that almost no one can without coring/grinding the material.
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Old 10-04-2012, 12:50 AM   #24
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Rick-- A question..... In the aerospace industry we use ultrasonic testing to look for voids or delamination in composite structures. Flaps, ailerons, stabilizers and now, of course, wing and fuselage sections. This is nothing new---- we filmed Qantas maintenance engineers checking a composite flap surface for delamination using ultrasonic equipment back in the late 1990s. So would this not provide a pretty accurate way to determine the integrity of a fiberglass hull?

As you say it requires specialized equipment. In my 1990s example it was a two person job: one guy running the sensor over the surface and the other guy looking at a portable display. But wouldn't this same technology apply to fiberglass boats as well? Granted, it doesn't tell you anything about moisture content. But I would think it would show delamination and voids if they are present. And from what I've seen here and in Charleston the equipment is getting simpler and smaller and presumably less expensive all the time.
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Old 10-04-2012, 05:34 AM   #25
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"But I would think it would show delamination and voids if they are present."

If you are looking for gross problems a simple tuning fork is a great tool.

Good on solid glass , less useful on foam core , as both sides need to be checked.

Low cost , easy to hear differences in sound.
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Old 10-04-2012, 09:13 AM   #26
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"But I would think it would show delamination and voids if they are present."

If you are looking for gross problems a simple tuning fork is a great tool.

Good on solid glass , less useful on foam core , as both sides need to be checked.

Low cost , easy to hear differences in sound.
Makes sense. Tuning forks are handy for the same use checking steel for cracks.
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