Boat Essay

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BOATS By Tobias Coombs, Joshua Graham, Ashley Johnson DTS, 1B 5-21-14 History of boats In ancient marine times people built boats out of bamboo, bundles of reeds, air filled animal skins and more. One of the first boats was made out of sticks and put together with sewn hides. Also at the time then didn’t have oars invented yet so people would use their hands to make the boat move. And to move the rafts they would push poles against the bottom of the rivers or lakes. Then they came out with sails which would replace the action of the humans and sail boats could take on longer trips and heavier loads rather than just the boats make out of sticks. Then they came out with the Viking long ships, those would be about 30 meters long made out of overlapping planks of oak wood, held together by iron rivets. Each ship would carry about 60 oarsmen who rowed the ship. Next they came out with the Chinese junks which were constructed out of softwood and had a horse shaped stern. And their sails weren’t like most, instead of squares they were more built pointed on the top and squared at the bottom. Then they had the three and four masted sailing ships which were in service for several centuries and these wooden ships were used for battling. Then we came out with the clipper ships which were fast sailing ships with long slim hulls and tall masts. Next they came out with the steamships so instead of sails and oars to power it, it was combined with wind and wind power. Then they had the ocean going liners which were driven by a propeller and made of iron. And they came out with the steam driven boats which had paddles on the side of them. Next the sailing ships were converted to diesel power so that they would use oil instead of steam. ... ... middle of paper ... ...ty. This equation means that if the boat is big enough, and pushes enough water out of the way; it could float with almost any weight. I say almost because there is a point when the weight becomes so incredibly large that in order for there to be a hull big enough to hold it all, the boat wouldn’t be feasible to build but other than that, this equation will work for all instances. That is the basics of how boats float. https://www.google.com/#q=displacement+definition http://wonderopolis.org/wonder/how-do-boats-float/ http://wiki.ubc.ca/Buoyancy,_Pressure,_Bernoulli%27s_Equation http://en.wikipedia.org/wiki/List_of_boat_types http://www.boatsafe.com/kids/022298hulls.htm http://www.admiraltyservices.com/Boating_Tips/boats_are_made_of.htm http://www.kidcyber.com.au/topics/shipstimeline.html http://www.historyanswers.co.uk/themes/inventions/41300/chinese-junks/

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