Galley Hull Desgin

Discussion in 'Sailboats' started by barbarian, Aug 20, 2012.

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barbarianJunior Member

I was trying to understand how the wood frames would go when the physical model was build. Heres how I did it you guys show me what I have wrong so far.

First I got the plan view with the intersections of the grid

I carried those lines across and got these lines I know I have figure out the bump in the front. Whats the bump for anyway stability?

and the side one. Now can someone show me how the wood frames will go in the front in the physical model. What happens to the red arrows in the front

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kvsgkvngSenior Member

I saw a National Geographic program about Egyptian merchant ships of approximately that or a bit earlier times. Contrary to the today's methods, when the ship resembles a herring skeleton dressed in a skin, Egyptian craftsmen were building their boats as a shell without any framework. They didn't have any wooden frames at all and fitted all boards in a custom way forming the hull shell from scratch. Then water made the wood swell and close all cracks.

Today's technology for wooden boats make use of heavy longitudinal "backbone" keel, then cross frames at regular intervals and then the hull is built on top of the framework.

I hopefully answered a least some of your questions.

Best regards.

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barbarianJunior Member

I understand that but what I was trying to figure out once the frame is build how will the boards of the hull go in the front of the ship.
Take for example the back of the boat, all the boards for the shell will gradually towards the tail following the curves of the buttock lines.

Now what path will the boards of the shell follow in the front. Some boards will follow the path of the buttock lines others will follow the curvature of the bend in the front. What happens in between? circled in yellow

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gggGuest...

I don't know that I could ever visualise how the planking has to go starting with a CAD drawing. That's a real big deal because none of the sections, be it buttocks, waterlines or diagonals really have much of a relationship. I think you need to arm yourself with some heavy cartridge paper of very light card and sticky tape, and make a few models and get a feel for it. You can draw planks on your paper or even use graph paper to get a feel for it. Start with a bit of paper like this, fold down the middle, cut out the black bits and tape them together, then spread the centre apart and you'll start getting a feel for how planks run.

Oh and ignore the gray rectangle in the middle which is image software doing something stupid, its the cutouts at each end I mean. That should give you something like a canoe with vertical bow and stern at each end, play with different size cutouts toget a feel for how you might approach the shape of the classical warship and how the planking might run.

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barbarianJunior Member

I see thanx a lot guys much appreciated

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capt vimesSenior Member

barbarian:
now i got it - i think...
you are not looking for the buttocks but for the lines of the planks...

when i look at some images of such triremes (be it drawings or models) i cannot help noticing, that the planks run completely horizontal in the bow area where there is this "bump" for piercing the other ships...
have a look:
http://www.nexusboard.net/sitemap/8501/kriegsschiffe-der-antike-t38/

they do not bend upwards... the forward high pointy bit is only the keel which is drawn up high - very much like the "dragonhead" on a viking boat...

edit: apropos vikings
the stern of such triremes is very much build like a viking boat:
http://en.wikipedia.org/wiki/File:Gokstadskipet1.jpg
the bow ain't...

nevertheless - you need a model of the hull first otherwise you will not be able to figure out how the planks need to be cut.

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Earl BoebertSenior Member

Whenever I'm faced with a difficult planking problem I carve a half hull and experiment with splines to lay out the courses of planks. When the number of lines on the hull get too confusing I give it a coat of primer and start again

Cheers,

Earl

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barbarianJunior Member

I will figure out the hull then see what I can do about the planks

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barbarianJunior Member

Ok guys let me know what you think how does this look any flaws

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capt vimesSenior Member

your stations in the second image look ok - although they do NOT show your pointy bit...
but the lines in the profile view are still no buttocks...
read again through the post from DCOckey:
i attached an image from your profile where i marked 2 coordinates...
in a 3 dimensional plan consisting of 3 views every point is represented by 3 coordinates: x-y-z
x runs along plan and bodyplan horizontal from left to right
y runs along profile and plan vertical from bottom up
z runs along profile and bodyplan vertical from bottom up
the vertical lines in your profile are the buttocks... the point i marked has a z coordinate and a y coordinate (which is fixed like the x for any station) you can measure from the plan - the x coordinate you know because you should know where you have drawn your station!
find the station (a vertical line at a given x) in your bodyplan mark the z you measured at that line and do so for all the other points... draw a nicely curved line through all this points - you get your first buttock!
if you are not sure at some points where it bends dramatically, insert more stations...

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capt vimesSenior Member

forgot the image...

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barbarianJunior Member

I see thanx mate

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barbarianJunior Member

Hey I hate to bother you guys with these questions but Now I have another issue how do I fade out the curvature on the bottom. Where dois it begin to smooth out on the ship

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