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Any thoughts onhow to make this boat better
http://www.fleetsubmarine.com/diving.html
To submerge, the crew opens vents at the top of the ballast tanks. This lets the air out. The bottom of the ballast tank is open to the sea, so as soon as the air is released water comes in to take its place, the displacement increases, and the boat slips below the surface. Submarines are designed so that, with the main ballast tanks full, the weight of water they displace will be as close as possible to exactly equal to the weight of the boat. In practice, the boat should retain a slight amount of positive buoyancy, so that it will want to slowly rise to the surface if nothing else acts to keep it under. "Dave Doe" wrote in message . nz... In article , says... "Dave Doe" wrote in message . nz... In article , says... "Dave Doe" wrote in message . nz... Can you sink a 'positive buoyancy' boat with water? Can you sink it with lead? You've proven my own point. What do submarines fill their ballast tanks with? positive bouyancy boat submarine - EVER. Bzzzt...Oh, I'm sorry, the correct answer is ''WATER'' . Thanks for playing. Water - ROTFL. No, subs sink cos either they're heavier than water in the first place, or they use ballast that is heavier than water such as: Lead, or for modern wartime subs I would think they'd use DU (depleted uranium). Water! - LOL. So the correct answer is most assuredly not water. Subs are made so that the mass/volume is denser than that of water - and they sink. They then have *AIR* in them that provides bouyancy - the cool thing about air is it's *compressability*. The "blow the (air) tanks" - and the decrease in bouyancy means they sink. To surface, they blow the water *out* of the air tanks, filling 'em with the air from the compressed air source. Think of a diver - FFS. They sink because of? Same as a sub - only as said, I would think modern war subs use denser material such as DU - 'cos they can afford it. So the correct answer is lead or DU. -- Duncan |
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