Cored Hull, what does that mean?

[NaughtyDog]

I have heard the term Cored Hull in a few threads now and am wondering if someone would be willing to explain what that means? Is it a bad thing or does it just mean more prudent maintenance? And would my 2001 400 Sedan Bridge likely have one or not? That last question might be better directed to Rusty or Frank W.? My hull number is US-SERP5331E101 400DB-608
I could probably find the information through Google but I am much more confident in gaining accurate info through CSR!

 

[ZZ13]

Hey ND, my boat must have been two behind you on the line. I am hull number 5333E101. So our boats rolled of the line in May of 2001.

 

[NaughtyDog]

I have heard the term Cored Hull in a few threads now and am wondering if someone would be willing to explain what that means? Is it a bad thing or does it just mean more prudent maintenance? And would my 2001 400 Sedan Bridge likely have one or not? That last question might be better directed to Rusty or Frank W.? My hull number is US-SERP5331E101 400DB-608
I could probably find the information through Google but I am much more confident in gaining accurate info through CSR!

Oh I always thought the ***-608 was the production number


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[ZZ13]

Oh I always thought the ***-608 was the production number


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You may be right. So maybe just right behind you as I am -609.

 

[Gofirstclass]

Nauty, coring is done to reduce weight. Fiberglass and resin are heavy, coring (often balsa wood) is very light. Many boats are cored and it isn't an issue unless the coring gets wet.

Here are some pics of my 1996 330 Sundancer that was hit by a BUI. The boat was totaled and I got another 330, but at least you can see in the pics some of the coring....








The coring usually is put in the hull down to where the shear line is, well above the water line. On the deck, it's sandwiched in between two layers of fiberglass and it's clearly visible in the bottom photo where a chunk of the coring is hanging out there.

 

[ZZ13]

Is coring used now still balsa? Or something synthetic more tolerant of moisture?

 

[NaughtyDog]

You may be right. So maybe just right behind you as I am -609.

Then we are practically family! LoL!


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[ZZ13]

Then we are practically family! LoL!


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I think we'd have to contact Sea Ray and give them the hull id to get the definitive build data for the boat.

 

[JimG]

This is the cored hull from the transom on my 310... it's a plastic of some sort.

 

[NaughtyDog]

This is the cored hull from the transom on my 310... it's a plastic of some sort.

That's interesting, thanks for the pic. I guess a plastic resin seems smarter than Balsa that could be compromised by moisture...

 

[my3sons]

Naughtydog, The deck and hull are cored on our 400's. Not a bad thing, most boats have cored top decks, and most over 40' have cored hulls. It's important to understand it so owners can avoid situations where it could be compromised.

 

[cwiert]

The 400DBs had balsa-cored hulls until 2002 above and below the waterline, to about 6" on either side of the keel. After 2002, they stopped using balsa-coring below the waterline, and went with a solid core on the lower hull, but still used balsa-coring above the waterline. Fast-forward to more modern Sea Rays. They are back to coring the hulls below the waterline to reduce weight, but they don't use balsa anymore. They use a synthetic material that does not rot.