Theory regarding hits - SailNet Community

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Old 09-27-2012
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Theory regarding hits

I've had the opportunity to investigate several boat that have hit hard. I've also seen how the insurance company and various yards manage the repairs.

My data set is pretty small but I have a concern I would like your opinion about.

When a boat hits hard there is visible damage, cracked glass, adrift tabs etc.
I'm pretty sure there is invisible damage too.

Damaged internal fibers and maybe cracked glass that is not visible due to pans and other construction details.
I'm thinking that a boat that has hit hard, hit ledge or other boat for example and repaired may look perfect but may not be as rigid as it was before.
That means that the next time is is stressed either by another hit or by storm conditions it will suffer more damage that would be expected.

Do you know of any surveying techniques that would look for this problem specifically and do you agree that this situation can exist?
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Old 09-27-2012
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Re: Theory regarding hits

Yes, damage can be hidden by structure and covers and tanks and such. Bare fiberglass shows it's damage really well. You won't get many surprises if you can get it to where you can SEE the bare glass. Getting to that point is the hard part with boats. I fixed a lot of crashed race cars, metal cars with glass bodies and it ins't too hard to asses the damage to a piece that you can see at least one side of. I only ever had a failure to a repair when I warned that if we cheaped out it might fail eventually and the car owner decided to cheap out because it was worth the risk at that time.
Big difference between a cheap repair on the 2 lb. fender of a toy and the bottom of a boat.
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Last edited by sww914; 09-27-2012 at 11:49 PM. Reason: I only have 4 fingers and they get confused sometimes.
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Old 09-30-2012
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Re: Theory regarding hits

I heard that one test that can be done is to run a taut string from the bow rail to the stern rail and mark where it crosses the mast.

Then tighten the back stay and see how easy it is to banana the boat.

Sounds like fun but unless you had a way to measure it like a hydraulic back stay gauge what good would it do.
Also you would need a reference deflection and tension.
I wonder how much more noodley some boats would be than others.
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