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[Unsinkable 2]

Is the draught from the lowest point of the boat to the waterline or to the deck? Or is something else completely? U2

[Netleyned]

Lowest point of hull to the waterline 

Ned

[derekwarner]

 .......it really has nothing to do with that Sam Plimsol bloke but for clarity lets start there 

If the ship were sitting with her Plimsol marks on the waterline, and the lowest part of the vessel was her stern post, the actual draft of the vessel is the vertical distance from the waterline to the depth of the stern post

Another simple explanation is the depth of water a vessel draws....vessels are commonly listed as length, breadth and draft....however the last unit of measure can change with the condition of load of the vessel be it through cargo, fuel or water ballast

When vessels are laid up for lengthy periods, the below waterline anti fouling is often seen riding high in the water, as the Top Brass have sensibly minimised the amount of dead money fuel she is carrying......

Now the Puffers that carried oak barrels of that dark Guinness liquid from the Island of manufacture to UK would when considered, reference a different concept of draft  .................. I believe a vessel with large stainless steel tanks is used to convey the ale to the UK.......Derek 

[Netleyned]

Might be of interest Derek


http://www.irishships.com/guinness_boats.html


Ned

[derekwarner]

Thanks Ned......I had a little understanding of the original transportation of that BLACK goop in oak barrels.......but your link explains all  .....

Mind you, whilst many of my steamer colleagues are avid consumers, I am not a fan of Guinness  .......Derek

[deadbeat]

You should also bear in mind that the draught of a ship changes depending on water density, eg a ship's draught is greater in fresh water, than sea water, brackish water somewhere in between.

[Unsinkable 2]

Thanks guys, nothing's ever simple is it?


My reason for asking is that after starting a new drawing I took a draught measurement from information on the Internet, it said 24cm, I am trying to draw my plans from a photo and when I scaled it up it was 24cm from the lowest part of the keel to the deck.


I have taken the advice off you guys and combined it with pictures from Google and come up with what I think is now a reasonable result. So thanks again. Pics soon.  U2

[malcolmfrary]

Thanks guys, nothing's ever simple is it?


My reason for asking is that after starting a new drawing I took a draught measurement from information on the Internet, it said 24cm, I am trying to draw my plans from a photo and when I scaled it up it was 24cm from the lowest part of the keel to the deck.


I have taken the advice off you guys and combined it with pictures from Google and come up with what I think is now a reasonable result. So thanks again. Pics soon.  U2

Ah well, "information on the Internet".  It does rather depend on whether the person putting the information on knew what they were doing, doesn't it?  hen you think about it, if it was a "hull depth" measurement, from highest to lowest, which bit of deck would you measure from?  Think X-bow vessel.  It has to be from a straight line reference , and, to give an idea of how much water is needed to float, the lowest point.  The way many (usually smaller) vessels sit in the water, there is a great deal less draught at the bow than the stern, but larger vessels tend to be much the same most of the length.  Probably because thats the only way to build them economically.

[Colin Bishop]

Maybe confused with hull moulded depth:
 The moulded depth is the distance from the baseline to the top of camber on the weather deck, at midships (excluding the thickness of deck plating)
Colin

[Deckie01]

Draught is a posh way of saying Draft. Therefore, draft/draught are the same thing. The draft is the distance from the keel plates (bottom of the ship) to the waterline.

[Unsinkable 2]

Ha ha ha like I said it's never simple is it....


Information on the Internet was actually from Westbourne models Atlantis advert and verified by  robbe instructions according to a builder (of an Atlantis) not any old builder who drinks tea with 4 sugars!


Thanks anyway guys, if I wasnt confused before I am now........ But at least it's sorted....... U2