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pleiades
Uploaded by
armitage shanks
, Nov 30 2011 08:53 PM
- Owner: armitage shanks (View all images and albums)
- Uploaded: Nov 30 2011 08:53 PM
- Views: 1,193
- Category: Fraserburgh (FR)
going through caladonian canal
fresh water must have bigger effect on steel boat
displacement versus length of waterline.
wooden boat of 60ft weighs less than a steel boat of 60 ft?
wooden boat of 60ft weighs less than a steel boat of 60 ft?
Built Watchful BF107 .. Built at Jimmy Nobles, FR .. 1958 for late Sk James Alex Reid, Gamrie etc.
Fresh water has a lower density than salt water, so the boat will be less buoyant in fresh water, so it sits deeper in the water because it must displace more water to stay afloat.
The “force” required to keep the boat afloat is exactly the same, however. If the ship weighs 50 tons, then it must displace 50 tons tons of water. It’s only that salt water is denser, so less volume of it is required to make that 50 tons, so the boat sits higher in the salt water and lower in the fresh. That is why cargo ships have different loadlines for different areas, times of year etc such as FW, WNA
The “force” required to keep the boat afloat is exactly the same, however. If the ship weighs 50 tons, then it must displace 50 tons tons of water. It’s only that salt water is denser, so less volume of it is required to make that 50 tons, so the boat sits higher in the salt water and lower in the fresh. That is why cargo ships have different loadlines for different areas, times of year etc such as FW, WNA
she was the last boat built in that yard
the w/h off o her went on the peaceful waters and the shelterdeck is on the dawn watch