What is (34)Bayliner marine core construction(34) ??-gctid802518

[yachtman]

I was reading the manual for my 1988 Avanti 3450, it says that it has " exclusive Marine core construction"

Does anyone know what that means? It is a registered trademark of bayliner and a patented process.

I have been and was of the impression none of the bayliners under 45 feet have a cored hull. So do the 3450's have a cored hull or not. Does anyone know 100% the answer to this? (Actually seen and not just spewing others comments)

I am having some issues with the hull gel coat on my boat if the hull is cored it would answer some questions I have otherwise I would just have to call it damaged get coat but could be a symptom of a more serious problem.

I haven't cut any holes in my hull to find out i would prefer to avoid that.

So is Marine core just a name or is it an actual cored hull?

[CptCrunchie]

"yachtman" post=802518 wrote:
So is Marine core just a name or is it an actual cored hull?

A very good question, yachtman! I look forward to an answer.

[Davebangle]

I've cut a couple of holes in my 3870. It's definitely different. Appears to be composite , definitely not wood, but less dense. Total thickness of about 3/4". Outside kin is 1/4" inside 1/8" core 3/8". Appears to be micoballoons and resin. Never seen anything like it.

[yachtman]

I have always been under the assumption that the only cored parts of bayliner boats was the transom of course and the deck and cockpit sole. Nothing in the actual hull. Perhaps those are the parts they speak of when they say Marine core construction

What I'm seeing on mine is a large area of gel coat spider cracking that looks like it had been pushed out. As like it water got in and maybe froze and expansion did damge. However where this is that is impossible from what I see on the inside. If there was a core and it was water soaked and froze I can see how that happened otherwise I'm stumped. I guess just grind it off and repair it but if it's cored that's a different story. The boat had been left in the water in a covered slip un used for many years. So much so that all the bottom paint is gone to the water line. As in nothing.

I'll have to post a picture.

[yachtman]

I have a few different spot like this some are bigger and more extensive.




I know they are kind of hard to see . It's worse than the picture appears



I know this isn't cored hull but heat and bad gel coat so maybe it's poor manufacturing.

[Ruffryder]

Bayliner marine core construction...

Gelcoat / Hybrid resin / Bonding coat / segmented strand mat / syntactic foam coring /segmented strand mat / 24 oz woven / segmented strand mat / 24 oz woven

[builderdude]

Yachtman, the second pic: isn't that around the exhaust tube area at the transom?

[yachtman]

"Ruffryder" post=802549 wrote:
Bayliner marine core construction...

Gelcoat / Hybrid resin / Bonding coat / segmented strand mat / syntactic foam coring /segmented strand mat / 24 oz woven / segmented strand mat / 24 oz woven

That sounds like a make up of the ccockpit sole I surely hope they didn't do that in the hull.

I need to install a through hull transducer. I guess I'll find out. I hope I don't have to be the one to burst everyone's bubble that thought bayliners don't have cored hulls.

[Ruffryder]

most likely not, but shouldn't be any issues with Bayliner marine core construction

post #3, we all know 38XX series hull was constructed cored hull...

[yachtman]

"builderdude" post=802550 wrote:
Yachtman, the second pic: isn't that around the exhaust tube area at the transom?

Yes it is. I imagine that is just heat damage or poor lay up technic from the factory. You know just one more thing to fix on a neglected boat. The other side is the same way.

[smitty477]

Marine core construction....

[SomeSailor]

"yachtman" post=802551 wrote:
That sounds like a make up of the ccockpit sole I surely hope they didn't do that in the hull.

Sure they did. They're nothing wrong with and if you're gonna try to plane a hull you need to be concerned with weight as well as economy of construction materials. It's completely acceptable in the industry to have foam hulls. Matter of fact, all of the bigger hulls were cut on a 5-axis router up here in Washington. They built ball the mold plugs in Arlington before they shut down. You could drive by and see 10 or so hull sides all clamshelled together getting ready to hit the road.

[CptCrunchie]

"Ruffryder" post=802549 wrote:
Bayliner marine core construction...

Gelcoat / Hybrid resin / Bonding coat / segmented strand mat / syntactic foam coring /segmented strand mat / 24 oz woven / segmented strand mat / 24 oz woven

Don't know much about Bayliner construction, but I know a lot about syntactic foam. Made of tiny glass balls bonded in an epoxy, that stuff is beyond tough. It is so crush resistant, Phil Nuytten used it in his 'Newtsuit' and 'Exosuit', and in his deep-diving "DeepWorker" submersibles.

[attachment]35065 wrote:
swimsuit.preview.jpg[/attachment]

If it's good enough to handle 1000 fsw, it would do very well in a Bayliner hull.

[yachtman]

Well if the hull is cored and it has moisture in it and it did freeze and expand and did damage to the hull then that is a big problem. If it's still wet. That is a big problem. There is absolutely no way to dry it out.

That is really the question. If it's cored and got wet big problem if it's not cored well just crappy gel coat. It does seem solid though.

[builderdude]

Sounds like it's time to take a slice from the inside and find out what's actually in there.