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Deck beam camber

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Bird

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Hello everyone I have a question about deck beam camber on the Sussex navy board model, my question is in the book he says to tie a string to a nail and pencil on other end at 4foot 7 inches and draw a camber line, I cut the plexiglass to the camber on the print, and I made this jig for the bandsaw I saw Jorge make for cutting deck beams, I did the 4foot 7inch measurement and put a pin in the table and it works great but the camber did not match the print, so which is correct that is my question? Any suggestions or thoughts would be greatly appreciated thanks everyone.

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I had read somewhere in on of the posts or books that average deck curve was about 6" for every 10' of width from center beam of deck.

Some ships also had change in curve as the deck went fore or aft of main mast location.

I know it is just a general figure but give a guide as why the angles change from deck to deck and beam to beam.
 
Bird said:
Hello everyone I have a question about deck beam camber on the Sussex navy board model, my question is in the book he says to tie a string to a nail and pencil on other end at 4foot 7 inches and draw a camber line, I cut the plexiglass to the camber on the print, and I made this jig for the bandsaw I saw Jorge make for cutting deck beams, I did the 4foot 7inch measurement and put a pin in the table and it works great but the camber did not match the print, so which is correct that is my question? Any suggestions or thoughts would be greatly appreciated thanks everyone.













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Uwek may say the problem is that you didn't use a green mat with white lines......ha ha
 
The proper way to find the deck camber is draw a base line the main beam length find the center draw a half circle the diameter of the depth of camber divide it in to three the do the same on the base line the measure the vertical lines in the semi circle transfer each one to baseline verticals then draw a fair line touching all the points this should give you your deck beam camber that's the way I was told as about builder best of luck mickey
 
Is the drawing correct? Maybe you can check the chamber also in the longitudinal section?
If the drawings are correct I would follow the drawings - otherwise you have to adjust everything / all measures based on this change
and btw: the mat is not the problem ;)
 
On my current build the HMS Triton I had near 100 deck beams to construct. I used the "Harold Hahn" method. I built his jig. Used 3 piece laminate to achieve the permanent camber. The actual camber is a formula. But many drawings show the camber. Here are some pics of where I went. Top pic is the jig. Middle pic is a beam showing the three individual pieces glued together. And lasly a vew of the ship's beams. IMO my ship has the lower deck cambered but it is hardly noticable. Also I did the deck clamps to spec. They are hardly noticable. 20231216_083418.jpg20231216_083525.jpg20231216_083538.jpg
 
Why not draft the ratio suggested in the book, and then see how that compares to the drawing?

1/4”:1’

If, for example, the main beam length is 40’, then the rise of camber would amount to 10”.

The camber shown in the drawing appears quite exaggerated to me. The pin and string beam that you cut looks far more reasonable.

You might see the degree of camber drawn on those plans on a poop-royal deck of a large first-rate, where the additional headroom in an otherwise cramped interior would be welcome.

As drawn, the gun deck camber looks as though it would interfere with the recoil of the guns.
 
Well, maybe not if the planset creates a deck like a vanishing horizon.

There’s camber, and then there’s the hills of San Francisco.

On the other hand, there are established rules and ratios, so why not default to them.
 
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