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Author Topic: Mahogany  (Read 3880 times)

fatcat123

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Mahogany
« on: February 08, 2011, 12:19:50 pm »

Hi folks,

I'm currently building a whitby coble from scratch and plan to use mahogany as the planks.

My issue is - the width of the sheets i can get is only 4" which wont accomodate the sweep of the coble.

Now my idea is this - I want a thickness of 2.4mm and so was thinking of using 3x 0.8mm sheets and laminating them but staggering the joins and would use pva to glue them.

I may need to soak the mahognay for a few of the bends on the planks as in areas of the boat, its pretty severe and so would the sheets de-laminate after contact with water?

Dan

P.s does anyone know where i could get any 2 - 2.5mm sheets of oak from?
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Circlip

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Re: Mahogany
« Reply #1 on: February 08, 2011, 01:46:48 pm »

One of the screaming problems you're going to have Dan is that the woodgrain doesn't scale. One way round the problem is to use a fine grained wood and stain it to simulate the "Full sized" counterpart.

 Some PVA adhesives are supposed to be waterproof after drying, check the instructions on individual products.

 For Oak, see above comments.

  Regards Ian.
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fatcat123

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Re: Mahogany
« Reply #2 on: February 08, 2011, 02:11:49 pm »

Hi Ian,

Thanks for your comments.

I understand about the scale of grain etc but when you look at a coble close up, its not that smooth of a plank anyway. They use larch on oak ribs for the real ones.

I need to get my hands on some first i think and go from there.

I have some obechi here which seems perfect for grain etc but i just dont like it very much.

Dan
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grasshopper

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Re: Mahogany
« Reply #3 on: February 08, 2011, 03:31:32 pm »

would you be better off soaking or steaming, bending and holding / moulding to shape until dry and then laminating ?
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fatcat123

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Re: Mahogany
« Reply #4 on: February 08, 2011, 03:42:23 pm »

The planks wont be the full shape though as the sweep basically has a front, middle and end. The height difference between the middle and front and back will be more than the width of the 4" sheet i can get.

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a3nige

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Re: Mahogany
« Reply #5 on: February 08, 2011, 04:59:55 pm »

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nhp651

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Re: Mahogany
« Reply #6 on: February 08, 2011, 09:24:40 pm »

another big problem using mahogany as a timber, is that mahogany and it's dirivatives including sapele to name one are very "short grained" timbers....i.e. the grain tends to run across the plank regularly, and in this way cutting such small planks in width and thickness, you tend to get them breaking off in regular abandon.
ask any older builder who cut his teath on an early billing boats kit..they supplied mahogany in early years...the timber was awefull to work with, and that's the reason they eventually changed to a longer grain timber.
a nice lime, pear or cherry wood would be great for purpose, and of course the ubiquitous obeche which also has been mentioned.
neil.


http://www.justgiving.com/lochnessscalesail
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fatcat123

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Re: Mahogany
« Reply #7 on: February 08, 2011, 09:26:47 pm »

Cheers Neil.  :}

I think i'm going to have to use obechi as it seems to be the easiest from what i've researched and been told.

Dan
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triumphjon

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Re: Mahogany
« Reply #8 on: February 08, 2011, 10:26:36 pm »

company ive used in the past through ebay , trade as specialised timbers , can supply all manner of both planks and veneers ! very good service from them .
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gondolier88

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Re: Mahogany
« Reply #9 on: February 09, 2011, 06:31:44 pm »

Why not go out for a walk and find a larch tree (or any other resinous connifer), see if it's got any recently dropped boughs that aren't rotten yet. It will be green enough to bend like strip of brass.

I used a found bit of larch once, beautiful stuff to work with, and having no percievable grain pattern it models very well.

Greg
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fatcat123

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Re: Mahogany
« Reply #10 on: February 09, 2011, 06:42:00 pm »

Seemed to work on the full size cobles really well also!

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gondolier88

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Re: Mahogany
« Reply #11 on: February 09, 2011, 07:57:58 pm »

Larch on oak is a very common boatbuilding standard. Helped by the native forests near you around Scarborough having plenty of oak and evergreen species, I think Ruswarp had quite a bit of forest too, a lot still remains of course, but the wood and good farmland was of course a major draw to the norse setlers who came up the esk.

I'm sure you know the guy if your building a model, but there used to be a coble yard down at Sandsend, he might have some bits of timber offcuts lying around...


Greg
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fatcat123

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Re: Mahogany
« Reply #12 on: February 09, 2011, 08:09:12 pm »

tony goodall i think it was and i believe he's dead. The yard is now the car park at sandsend, all concreted over.

Only others were clarksons, whitehalls and lowthers in whitby,

Whitehalls yard now is the new flat complex, clarksons shed was sold a few years ago (i just missed out on that one) and not sure where lowthers were. eitherway everyones dead, gordon clarkson passed away in autumn 2009.

Only people capable of building a coble in this area that i know of are lennie oliver and steve cook as a combined team. They built a one off coble in 2004 in gordons old shed as steve was renting it. Its name was Bay Joe and i believe it went to robin hoods bay.
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