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Repair from a hanse 418 after grounding on a rock |
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Baybreeze 
Sub Lieutenant 
Joined: 15 September 2020 Location: Malta Status: Offline Points: 15 |
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 Posted: 17 February 2021 at 16:20 |
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Sorry...this was in reply to Matt1: My 418 is balsa core above the waterline. I’d be very surprised if Hanse have ever built a boat with core below the waterline. It’s generally not recommended
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alettaenmarcel
Admiral 
Joined: 15 August 2006 Location: Netherlands Status: Offline Points: 1246 |
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Posted: 17 February 2021 at 17:13 |
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hanse used pvc foam cor for their epoxy models in the past, and thos were also beneath the waterline with this sandwich methode of building.
The balsa core has never been used below the waterline. Gr Marcel
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Kids Dingys 72-79 ,Several Windsurfboards 79-86 OK dingy competitions 86-92 , Trotter Pandora Race 92-98, Friendship 28 Sport 98-05, Hanse 370 06-......
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Matt1
Rear Admiral 
Joined: 10 March 2019 Location: Hamble, UK Status: Offline Points: 727 |
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Posted: 18 February 2021 at 08:52 |
If you poke around under bunks and lockers, you can see where the balsa runs out and turns to solid laminate around the waterline You can also get a clue as to the laminate thickness at the bow thruster and saildrive openings (if ever your saildrive gaiter comes adrift like mine did)
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Hanse 418 #64 EmBer. Hamble, UK
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Carlosailfan
Captain 
Joined: 06 March 2014 Location: Belgium Status: Offline Points: 194 |
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Posted: 18 February 2021 at 09:28 |
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I installed a few things on our 385 under the waterline and the hull is massive :). Pure laminate, no balsa or insulation, massive fiberglass. I did also a few destructive test with the removed parts, they did not break !! I do not tell you how i did seen this looked ridiculous but it convinced me a drifting container will not so easy enter my front cabin :). Looking to the interior frame, well designed for carrying all the keel weight and forces during sailing, just one point, not designed to have the forces the opposite way like a grounding, then you rip it off. And to stay on the honest page this is not an issue only reserved for Hanse Yachts. i have seen several other brands as well.
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Best regards
/C |
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andrewlambert
Commander 
Joined: 14 January 2020 Location: UK Solent Status: Offline Points: 103 |
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Posted: 18 February 2021 at 18:48 |
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good shout matt1 of how to check depth of hull layup
on a 2007 370, i am just doing the sail drive gaiter , around that area the depth of hull is very visible ! I measured 32 to 33 mm of hull depth ALL solid laminate On my old hand built 80s boat in which I could see daylight through some parts of the stern layup ! Was not as solid. A result of the non “production boat” methods that cause variable quality. Hanse do a good layup Also , On the liner or strong back grid, the frame by the chain plates is massive, it’s as much to support mast as much as the hull Edited by andrewlambert - 19 February 2021 at 00:13 |
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Hanse 370 #237 "Ginger Bay" UK, River Hamble
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alettaenmarcel
Admiral
Joined: 15 August 2006 Location: Netherlands Status: Offline Points: 1246 |
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Posted: 19 February 2021 at 17:41 |
That is a wrong interpretation. The hull is made out off two sections and there is a big overlapp with laminate on the inside. And the saildrive fundation hase been laminated to the hull there so there is a lot of laminate there. The hull itself next to the overlap is about 10 mm. Mesured it myself wenn i made new true hulls.
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Kids Dingys 72-79 ,Several Windsurfboards 79-86 OK dingy competitions 86-92 , Trotter Pandora Race 92-98, Friendship 28 Sport 98-05, Hanse 370 06-......
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Caylieanddavid
Lieutenant 
Joined: 16 May 2019 Location: Brisbane, Aus Status: Offline Points: 44 |
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Posted: 19 February 2021 at 20:30 |
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I just cut a forward looking sonar in the area where the forward head would be and the hull is just a bit under 10mm of solid glass
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andrewlambert
Commander
Joined: 14 January 2020 Location: UK Solent Status: Offline Points: 103 |
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Posted: 19 February 2021 at 21:18 |
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Marcel / David what model and year Hanse do you refer to?
Marcel I see your point, so if I Understand you correctly the depth at the sail drive opening is the inner liner / grp strongback grid + hull ? Edited by andrewlambert - 19 February 2021 at 21:38 |
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Hanse 370 #237 "Ginger Bay" UK, River Hamble
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andrewlambert
Commander
Joined: 14 January 2020 Location: UK Solent Status: Offline Points: 103 |
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Posted: 19 February 2021 at 22:41 |
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Hanse 370 #237 "Ginger Bay" UK, River Hamble
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Caylieanddavid
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Joined: 16 May 2019 Location: Brisbane, Aus Status: Offline Points: 44 |
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Posted: 19 February 2021 at 22:52 |
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Hi it's 418#120 made late 2019 and going in the water for the first time on Monday!
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Baybreeze wrote: