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LittleSister

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It’s a 24’ boat. I have to stoop like Quasimodo as it is, even with sole boards that slope down with the hull.
I’m loathe to reduce headroom (headroom? I can rub my shoulders on the coachroof in places!) any more millimetres than is absolutely necessary.
I’d like to do the batten and board or plank thing, but I don’t want to be crawling round the cabin.

I know exactly the issue, as I faced it on a previous 'project' boat I owned, which had a double-curvature to the cabin top. As it happens, I sold the project on (for other reasons) before completing it, and perhaps because I'd recently re-visited that boat just as it was about to be launched but noticed the inside of its cabin roof was still bare, a 'new' solution occurred to me: plank it in thin wood.

I'd seen this technique (it probably has a name, but I don't know it) illustrated years ago in a magazine article about building a rigid double-curvature sprayhood or wheelhouse kind of thing. In that case it was multiple layers of thin 'planking' in different directions to get the rigidity, but for a headlining it would only need a single layer.

Get large sheet of thin wood (perhaps 3 or 4mm ply?). Cut a narrow plank (2 or 3 inches wide, perhaps? - it will depend on taste and how much side-to-side curvature you are faced with) the length of the cabin from this, and glue this to the underside of the cabin roof along the centreline. (The thinness of the planking allows for any fore-and-aft curvature, the shaping of then planks described below will accommodate any side-to-side curvature.)

Then cut another plank the same width. Assuming the cabin top is curved side-to-side, you will need to cut a curve in the side nearest the last plank you fixed, so that when mated up to it, the far edge of the new plank will be parallel with the edge of the previous plank. In a typical double-curved cabin roof (concave both ways inside) you will be trimming it to make the ends of the plank narrower than the middle of its length.

You will now need a marking tool with a pencil an adjustable fixed distance (an inch or so, perhaps, depending on how severe the sideways curvature of the roof?) from an edge face. (Perhaps a decent quality pair of draughting compasses with wheel for setting the opening distance might suffice?).

Hold or tape up the new plank (two or three assistants would come in handy here!) with its far edge exactly parallel to the outer edge of the previous plank, but the new plank's nearside edge a short distance from the previous plank. Adjust your marking tool so that when run along the edge of the previous plank the pencil tip just touches the furthest away point of the new plank's nearside edge. Now run the pencil along the length of the new plank. Also mark the plank so that you know which is the forward end, and which is the downward facing side - this will likely matter later!

Take the plank down and cut along the marked line. Offer it up again the previous plank. The curved edge should now sit neatly against the straight edge, while allowing the new plank to follow the curvature of the roof, and leave the new plank's straight far edge parallel to that of the previous plank. Assuming all is well then glue it in place.

Rinse and repeat!

If you wanted it to be fancier, you could glue a thin strip (perhaps even veneer?) of contrasting coloured wood on each of the outside (straight) edges before you mark and cut the next plank.
 

LittleSister

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So did we get our hopes up for nothing?

No, the saga continues!

Just as well, as we would be bereft without it.

In this particular case, the recent boat - a Beneteau 24, 26 or 28, who knows - remains under consideration. You can't expect Wansworth to be dismissing boats willy-nilly, he needs to carefully weigh and share and consult with us the merits and demerits of each boat.

Before dismissing it. 😄
 

Wansworth

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No, the saga continues!

Just as well, as we would be bereft without it.

In this particular case, the recent boat - a Beneteau 24, 26 or 28, who knows - remains under consideration. You can't expect Wansworth to be dismissing boats willy-nilly, he needs to carefully weigh and share and consult with us the merits and demerits of each boat.

Before dismissing it. 😄
😀😀😂😂😂😂😂…..you know me too well……still another outing tomorrow
 

DreadShips

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I was briefly worried this thread was heading towards accusing Wansworth of bumping off yacht owners as a negotiation tactic, but given it'd take him years to select a victim I think it highly unlikely...

(this is meant with full affection - I don't own a boat either despite being a fully signed-up Apollo Duck tragic, so I'm in no position to cast aspersions)
 

Bouba

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Wansey, if you need any reasons not to buy a boat....you can interview any of my joints. This is the annual takeout....and as well as costing an absolute fortune....my body has been squished and contorted....made to climb a ladder so, so many times...after three days I am in pain...and the end is not in sight....and this is just so I can save a few measly euros.
Activities that invoke our youth...were done with a body that worked
 
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