What parts are structural? (385 onwards)

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   Hi,
I have a 385, but I think this question has the same answer for the new gen 3xx and 4xx series. 

I am curious about the structural components under deck. More specifically, which bulkheads, supports etc. (except for the grid matrix structure). 

The list of components I am thinking of (but not limited to, I might be missing some):

1. Forward bulkhead
2. Deck support visible in front of the kitchen and probably in the forward looking part of the toilet wall
3. Bulkheads supporting the engine room
4. Bulkhead on the aft end of the aft cabins
5. ...

I have conflicting comments from different shipyards. 

As an example, the forward bulkhead, according to two boatyards is not structural, which is surprising. 

Many thanks in advance!

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sv_palamut Members Profile Send Private Message Find Members Posts Add to Buddy List Lieutenant Commander Joined: 28 January 2024 Location: Netherlands Status: Offline Points: 61	Post Options Post Reply Quote sv_palamut Report Post Thanks(0) Quote Reply Topic: What parts are structural? (385 onwards) Posted: 22 December 2024 at 16:30
	Hi, I have a 385, but I think this question has the same answer for the new gen 3xx and 4xx series. I am curious about the structural components under deck. More specifically, which bulkheads, supports etc. (except for the grid matrix structure). The list of components I am thinking of (but not limited to, I might be missing some): 1. Forward bulkhead 2. Deck support visible in front of the kitchen and probably in the forward looking part of the toilet wall 3. Bulkheads supporting the engine room 4. Bulkhead on the aft end of the aft cabins 5. ... I have conflicting comments from different shipyards. As an example, the forward bulkhead, according to two boatyards is not structural, which is surprising. Many thanks in advance!

Matt1 Members Profile Send Private Message Find Members Posts Add to Buddy List Rear Admiral Joined: 10 March 2019 Location: Hamble, UK Status: Offline Points: 727	Post Options Post Reply Quote Matt1 Report Post Thanks(0) Quote Reply Posted: 22 December 2024 at 17:09
	From a 418 perspective; There is a structural watertight bulkhead glassed into the bow section, then working aft; the main bulkhead between the saloon and forecabin is laminated in at the hull sides, but the fill in piece between the two sides (that has the door) isn’t Then there are some half bulkheads / webs around the galley and chart table and a full laminated bulkhead just fwd of the rudder tube (albeit with big holes cut into it for heater and exhaust ducts) I’m unsure of the heads molding / bulkheads
	Hanse 418 #64 EmBer. Hamble, UK

Brufan Members Profile Send Private Message Find Members Posts Add to Buddy List Rear Admiral Joined: 16 December 2010 Location: Belgium Status: Offline Points: 672	Post Options Post Reply Quote Brufan Report Post Thanks(0) Quote Reply Posted: 23 December 2024 at 10:37
	No bulkheads are structural on Hanses except the very bow and the very aft ones. Only the grid and deck (and mast post of course) are structural. Plywood bulkhead are really to thin to act as a structural part
	Bruno hanse 355 - 57 S/Y Spicy Ginger White hull, 2 cabins, Volvo D1-30, Selden rig, removable mainsheet track system, Simrad (now B&G)-Jefa autopilot.

sv_palamut Members Profile Send Private Message Find Members Posts Add to Buddy List Lieutenant Commander Joined: 28 January 2024 Location: Netherlands Status: Offline Points: 61	Post Options Post Reply Quote sv_palamut Report Post Thanks(0) Quote Reply Posted: 23 December 2024 at 16:02
	Thanks for the answers. It looks like both answers indicate that the bulkheads working as cabin/shower/saloon separators are not structural. I am very unfamiliar with the power distribution and supporting structures in different types of boats, but intuitively I assumed that at least the fore cabin/saloon separator was structural.



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