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Old 06-07-2009, 20:07   #1
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Jeanneau Lagoon Hull Core Material

Can someone verify the core material for Lagoon cats. I understood it to be foam, but am now told balsa, if this is correct, was there a switch over at some point or did I have a complete misunderstanding. Paticular to the hulls.
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Old 06-07-2009, 20:23   #2
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I am almost certain that they are balsa core hulls, decks and superstructure.
Even the ones made by Tilletson and Pearson in the US for a few years where constructed that way.
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Old 06-07-2009, 20:31   #3
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Lagoon Hull Core

I always understood them to be balsa. The Jeanneau-Lagoon 35ccc was built by TPI in Rhode Island using the SCRIMP infusion process, and it used balsa core.
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Old 07-07-2009, 10:34   #4
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According to the spec sheet for the new Lagoon 400 from the Lagoon website:

CONSTRUCTION
•Polyester and vinylester resin construction (osmotic barrier)
• Infused Balsa cored hull construction - white gelcoat
• Below the waterline: infused Hull bottom in solid GRP
• Infused Balsa cored deck and bridgedeck construction
• Solid glass or core-mat sandwich one-piece countermold
• Laminated wooden bulkheads either tabbed or glued

The Lagoon 440 is similar:

CONSTRUCTION
• Polyester and vinylester resins (anti osmotic
barrier)
• Balsa core hull, solid laminate under water
line
• Balsa core bridge deck and deck white
gelcoat
• Solid laminate inner liners
• Laminated marine plywood bulkheads

Presumably the other current models use the same methods.
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Old 02-08-2009, 22:35   #5
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Can anyone confirm that the Lagoon 410 is the same; solid glass below the waterline, balsa cored above?
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Old 03-08-2009, 01:12   #6
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Yes, the 410 is the same -- solid below, balsa above.

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Old 03-08-2009, 05:29   #7
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The core material on the Lagoon models that I've surveyed (I've surveyed most of them) is Balsa, and it doesn't stop at the waterline exactly. It (the core) usually carries down a foot or so below the waterline, so you have a foot or so of solid fiberglass before the bottom and the keel attachment.
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Old 11-08-2009, 15:17   #8
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amarinesurveyor: since we are right now looking after a used Lagoon 410 and you surveyed them – is it a right cat to choose for live aboard?
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Old 11-08-2009, 16:15   #9
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Only you can make the decision of wheter it is right for you. They are pretty comfortable boats and offer nice space for a couple and occasional guests. My job is to tell you the condition of the boat after I inspect it. I can't tell you whether to buy the boat or not, or if it is right for you.
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Old 11-08-2009, 17:19   #10
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Present Lagoon construction process.
catamarans LAGOON : construction, vente et location de catamarans de croisière

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Old 20-08-2009, 08:32   #11
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Wow. Verification that large cats are made in the "half-hull". My Tobago was obviously made that way. I found epoxy (or something other than a glass laminate) under the gelcoat along the joint at bow and keel, suggesting the structural glass for the joint was all on the inside. when the epoxy cracked, so did I. I ground it out and replaced it with 4 layers of glass and new gelcoat. It may not have been necessary, but I couldn't stand the thought of the crack through the epoxy on the outside
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Old 20-08-2009, 08:49   #12
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Quote:
Originally Posted by Sonosailor View Post
Wow. Verification that large cats are made in the "half-hull". My Tobago was obviously made that way. I found epoxy (or something other than a glass laminate) under the gelcoat along the joint at bow and keel, suggesting the structural glass for the joint was all on the inside. when the epoxy cracked, so did I. I ground it out and replaced it with 4 layers of glass and new gelcoat. It may not have been necessary, but I couldn't stand the thought of the crack through the epoxy on the outside
I hope you used epoxy resin in the repair.
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Old 07-09-2009, 16:38   #13
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Actually, I didn't use epoxy resin in the repair. After grinding out the epoxy, I used good quality isophthalic resin, matting and roving, and isophthalic gelcoat, same as Fountaine Pajot used on the rest of the hull. I laid the layers up on plastic sheet with a minimum of resin(about 20" at a time), applied acetone to the sanded-down area, and with the help of my wife, stretched and duct-taped the new material up a bit at a time. I'm happy with it now.
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Old 08-09-2009, 03:30   #14
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If you do mean Jeanneau then remember these are the boats with slanted windows: 35,37,42,47,55,57,67 and 82 all produced before Beneteau took over in 1995. To my best knowledge these were balsa underwater and sectioned divinicell above. Some of the 55s had some pretty wild material combinations making them very stiff and light... well stiff until the plywood bulkheads started exploding with alarming frequency.

Bene took over in 95 and started the vertical windowed boats at the land-locked factory in Vendée (having to be trucked to and launched at the privilege factory) The 570 stayed in Bordeaux at CNB with the 57, 67 along with some rumored plans for some real whoppers.
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Old 08-09-2009, 07:33   #15
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This is directly off their web site for the 1995 47 lagoon construction,which I believe was still used in the later vertical window lagoon. They did use different resins and glass in early models. A number were built with epoxy, vinyl ester, and kevlar and carbon fiber.

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