In this engineering science fair project, you will develop a fin (bilge keel) design that is best at keeping a boat from rolling back and forth. Even though rolling is a perfectly natural occurrence, it can be pretty tough on people who live and work on ships. A bilge keel is usually a simple piece of steel on the bottom of a ship that is aligned with the direction that the water passes over the hull (see Figure 2, below, for a diagram of bilge keels and other types of keels).
In this science fair project, you will learn how different sizes of bilge keels work and how effective they are at reducing the rolling motion of a ship.
You might need an adult's help to understand some of the information in the following books.
This book offers a scientific explanation of rolling motion and how bilge keels stop ships from rocking, on pages 269-270. A good explanation of what a bilge keel is and how it works can be found in this book, on pages 116-117.
Another good explanation of bilge keels and rolling motion can be found in this book, on pages 245-255.
Paint the inside of the bottom of the boat with a thick layer of rubber cement and set about 50-60 marbles in it.
Cement the wooden dowel vertically into your empty patch so that it sticks straight up out of the rectangular hole. Using a permanent marker, draw a line near the top of the bottle, from the front of the boat to the back, on either the right or left side. An oscillation is when the dowel rocks back and forth; for instance, if you tilted the boat to the right and released it, the boat would roll and the dowel would tilt to the left and then back to the right, completing one full oscillation. The oscillations will get smaller and smaller, until the boat finally stops, so make sure you count all of them.
Cut the other 2-L bottle completely in half, lengthwise (from the neck to the bottom), using the razor blade or knife. Now attach each bilge keel to the sides of the boat using a few pieces of the padded double-sided tape.
Repeat steps 5-6 from the section above, Building the Boat and Performing the Initial Test, so you have a total of three trials with the bilge keels attached, recording all data in your lab notebook. Now, trim 1 cm off the bottom (the part sticking out) of each bilge keel so they each extend 4 cm out from the boat. Continue trimming the bilge keels in increments of 1 cm and test each new length three times.
You should have at least three time values and three oscillation totals for each bilge keel length, including when the boat did not have keels. Make a bar graph where the x-axis is Bilge Keel Length (including "0" for the trial without bilge keels) and the y-axis is Average Number of Oscillations. Not all bilge keels are the same—some are shorter or shaped differently (see Figure 5, below). Instead of using only one permanent marker line, try using two or three and test each bilge keel design at each line. Try using something else besides marbles in the bottom of the boat, such as pouring plaster of paris in there and letting it settle and dry. Compared to a typical science class, please tell us how much you learned doing this project. The Ask an Expert Forum is intended to be a place where students can go to find answers to science questions that they have been unable to find using other resources. Water covers more than 70 percent of Earth's surface, and marine architects design vessels that allow humans and their cargo to cross through or under those waters safely and efficiently. Ship and boat captains have the important job of commanding ships and boats through domestic and deep-sea waterways, so that passengers and cargo arrive safely.
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What I have figured out that whenever KNsin(f) > KG (center of gravity height above keel), there is a positive rightning moment.
Now the graph is below 0.136 below some 33 degrees, which would say that the hull by itself will lay on its side at 33 degrees.
Q3: I either managed to design a hull which is unstable by itself (which I doubt, because the model of a very similar one has been very stable), or there is something I epicly misunderstood.
How many attempts will you make, how many threads will you open, how many members will you attract to hammer on you??? Location: Hungary I intend to continue my adventure into boat design, and try to make as informative posts as I can. When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Surely the fairest, most democratic way is for parties to be required to spell out to voters in advance of a local election exactly what it's council tax proposals are, and then be legally required to stick to them if they are elected.
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Location: Maryland Kach22, I can comment briefly on the 'plow-in' pehnomena as it relates to SES and ACV.
As the pressure gradient increases in magnitude, a secondary effect serves to amplify the pressure gradient and eventually result in the 'tip over' or 'plow in' event; as the lift center creeps aft and the craft trims bow down, the cross-sectional area of the cushion decreases forward and further restricts the 'duct' that the air is trying to move through to maintain the forward end of the cushion.

Location: Michigan Thanks BMcF, my goal is to apply a little boat common sense to hovercraft - just trying to start at the begining. I'm not sure a hovercraft which has lost it's lift power can get home on it's own, or if that would be a reasonable goal. When calculating Yogi s stabilty are tanks like the 10 ton swimming pool water tanks aft considered to be full or empty ?
But I assume during trials in level 8 sea (which was situation at time of accident) pools were empty.
Anyway, pools actually reduce GM but with strong list water comes out and situation is not so bad. Location: spain When considering stabilty what is the definition of SUPERSTRUCTRE ? Originally Posted by michael pierzga When considering stabilty what is the definition of SUPERSTRUCTRE ? Weathertight ones can withstand green water on deck but are flooded when openings are immersed. Location: Paris Believe it or not : there is no weather criterion for this kind of motor yacht !! Originally Posted by Pascal Warin Believe it or not : there is no weather criterion for this kind of motor yacht !! Originally Posted by Alik OK, this is what happens once stylist draws the windows close to WL.
In DNV Rules for Special Craft, Yachts are required to comply with main class requirements of stability, this means weather criterion is also applied. If the boat was under ABS, they do not have stability requirements in Motor Pleasure Yachts. Originally Posted by Pascal Warin You are right on every points but problem is that flag requirements takes precedence on class ones.
Location: Bangladesh Tanks and Compartments by Using Maxsurf How to create tanks and compartments by using maxsurf after creating a model. Location: Spain You have to fill the boxes indicating the limits of each tank. Location: PNW My own interpretation of a double ender is a vessel whose hull shape comes to a pointed or rounded end above and below the water. Location: ALABAMA viajero In the late 60's I sailed a double ended 65' ketch to Hawaii from Sausalito. They had cars in the 20s and 30s that looked like that too but that didn't make them double enders. Look in the April issue of Woodenboat Magazine to see many many real and true double enders.
I would have to politely disagree with your statement that a true double ender can be run backwards as well or almost as well as forwards.
Location: Lakeland Fl USA One more to add to the planing double ender list. When you call a flat stern Lund type skiff a rowboat you fog or haze the meaning of the word rowboat to the point that it has little meaning. These are double-enders, Scottish fishing boats, again the bottom and topsides terminate in an obvious stern post. Waves can travel in any direction, depending on a lot of factors, like the wind direction, tides, and ocean currents. Some people get very seasick due to rolling, and some equipment can be affected or even stop working due to roll. One of the simplest and most ingenious ways is a feature called a bilge keel, shown in Figure 1. By aligning it this way, the bilge keel doesn't slow the ship down very much when it is traveling straight ahead. Try skinny or fat, long or short, straight, curved, or serrated bilge keels, and see what works best. Although it uses a picture of an airplane, the movement is the same for a boat—imagine it rocking back and forth like the plane. It's not as smart as you are, and it may occasionally give humorous, ridiculous, or even annoying results! Cut a rectangular hole in one of the bottles, with the longest edges running from the neck to the base—this will be the top of the boat. You might want to cement some marbles around it to hold it in place and keep it straight up. Start the stopwatch when you let go of the boat, and stop it when it is no longer oscillating. The ripples will bounce off the tub walls and go back to the boat, so make sure you don't count when those ripples rock the boat some more!
Bilge keels extend straight out from the hull at a 90-degree angle (see Figures 1 and 2 in the Introduction).
Check the keels again and bend the bottoms of the keels until they're both pointing away from the boat.
Repeat steps 5-6 from Building the Boat and Performing the Initial Test again with this new length and record your data in your lab notebook. If you want to combine the graphs into one, divide each bilge keel's number of oscillations by time, and call that number Oscillations per Second. This can easily be done by placing the boat in a pool where others are swimming some distance away. If you have specific questions about your science fair project or science fair, our team of volunteer scientists can help. Some of their watercraft designs are enormous, like merchant ships, which carry huge loads of oil, cars, food, clothing, toys, and other goods, across thousands of miles of open waters.
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Design of multihulls and racing boats Hello everyone, My name is Yohan Garcet and i am a Naval Architect. Many (most even) early designs of both had their cushion air supply a the rear of the cushion.
Maybe just being towed by another reasonably sized craft would be a respectable achievement. You would answer yes and then call it a double ender as you are selling this boat I'm sure. For these reasons and many others, it's important for engineers to design bilge keels (or fins) to keep boats from rolling back and forth. Ships, on the other hand, need to travel in straight lines to get where they are going quickly. Roll also makes simple tasks, like eating, rather difficult, and it can make hard chores, like landing a helicopter on a ship, almost impossible.
But when the ship begins to roll due to wind and waves, the bilge keels act like a plow through the water. Think about construction and other reasons why bilge keels are a certain size, and investigate what other things ship designers or naval architects need to think about when designing a good bilge keel. This line will help you figure out how much you need to roll the boat—it will represent where you want the water line to be when you tilt it before letting it oscillate. You might want to have a helper assist you with the stopwatch since you will be tilting the boat. Finding the average of multiple trials is more accurate than using only one trial, because what if you made a mistake in that one trial? You might have difficulty with the neck and the bottom, so go ahead and cut those off first, as you won't need those parts.
If you have trouble with the tape sticking, take it off, dry the boat side and the bilge keel, and re-attach the bilge keel using fresh tape. See Figure 3, above, for a picture of the full ship assembly, and note the bent bilge keels at the bottom of the boat.
Rather than trimming the bilge keels down, cut a shape or a serration into the keel and test the new design. The waves and ripples caused by the swimmers will give the ship a more realistic environment, and will push the boat around for you so you don't need to tilt it. Our Experts won't do the work for you, but they will make suggestions, offer guidance, and help you troubleshoot.
At first it was just at the top of the upper strake, so I have scaled up the height (with 1.2 multiplier as I remember) to look better.
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They IC is a furious planing hull that is a double ender, but the taper of the aft end, is by rule, not to exceed 45 degrees per side.
Become an engineer for a day and discover the best way to keep from rocking the boat in this engineering science fair project!
Depending on the direction of the waves and the direction the ship is traveling in, the ship can really start to rock and roll! The plowing action of the bilge keels generates a force that acts in a direction opposite to the rolling motion, and this force slows down the roll. Make sure to keep them centered along the bottom of the boat—don't put more marbles on one side of the bottom than the other. The dowel will make it easier to see the boat rock back and forth, and it will also give you a handle with which to rock the boat.
When they start to get bigger again, that's when you should stop the stopwatch and stop counting.
After you've tested each bilge keel design, put an object in the boat on top of the marbles or plaster and test it again.
Take video of the boat in the water for each bilge keel design, and determine which design maintains the greatest stability.
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Tel Aviv defines such goods as dual use - meaning that while they are needed for the civilian population, they could also potentially be used by militant groups in attacks. Le but de cet v nement, qui est aussi celui de ce groupe financ par des capitaux trangers, tant de diaboliser et de diffamer l arm e isra lienne.Il semble donc que le gouvernement ait finalement d cid de r pondre aux provocations. The game is striking in both its anime-style art style and its attitude, which includes God checking in on your progress by calling your guardian angel over a mobile phone.
All his 12 children are to be beneficiaries, but the deciding votes will be held by his wife and one of his children. There is still no official number of dead since the fighting started, but officials estimate in the tens of thousands, while an additional 1.5 million people have been internally displaced and 500,000 have fled abroad.
It has two other LNG developments on its books a 5-mtpa plant at Vladivostok that could be on line by 2018 and could expand to 10 mtpa in the 2020s; and the 10 mtpa Baltic LNG project that could be producing in 2018. This type of boat design is one of the most well Amounts shown in italicized text are for items listed in currency other than U.S.
What we didn't know early on was how large a pressure gradient is developed in the cushion as a result of forward speed and boundary shear effects.
A main deck is the uppermost continuous deck which fully closes the hull, both in longitudinal and in transverse direction.
It is no surprise that they almost always configure the aft end, as seen in plan view, to be as nearly flat as the rules will permit. That boat looks so good to me I'm going to show it to a friend and he may buy it but I will not call it a double ender because it's pointed or tapered stern does almost nothing to change or enhance the performance or dynamic qualities of the boat. When a ship rocks from front to back or back to front, it is called pitch, and when a ship rocks from side to side, it is called roll.
The bilge keel only works when the ship is rolling and doesn't hurt the straight-ahead speed very much. Use the dowel as a handle and tilt the boat until the water line is at the line you drew with your permanent marker. Make sure you place the boat in the tub so that the front and back are perpendicular to the longer walls; that way the ripples have farther to travel before hitting the walls and bouncing back, so have less chance of interfering with the oscillations. Panicker submitted that it was mandatory for units with more than 10 workers and engaged in continuous processing, manufacturing, and distribution of any product to come within the ambit of the Act. The Promoter, its sponsor, or promotional partner are not responsible for the safe arrival of a prize or prize certificate. The next day, while inaugurating a road while Scioli stood at her side, she said: "We could have saved so much time if (the opposition) had realized just a little sooner" the value of the policies. Inother words, theCentral Bank is revving up tomanage acontrolled, slow-moving devaluation ofthe ruble that will soften theblow ofan external crisis andpreserve Russia's hard currency reserves: If Greece has acontrolled default, Russia will respond with acontrolled devaluation. Since then, the Philippines has obstinately pushed for the above-mentioned arbitration proceedings despite repeated objections of China. Here's an idea for MBC, start collecting the rates from those that don't pay rather than hammering the ones that do pay. Phelps then asked Hektoen if he would take a Snapchat selfie, according to the criminal complaint.
A Republican rewrite without Democratic input will not inspire broad confidence that elected representatives will put the public's interest over their own or those of special interests financing their campaigns.
In addition, 16 of the 33 Senate seats are up in the November election under the new legislative districts more favorable for Republicans, meaning their party could pick up enough seats to regain the majority.
In May-June last year, a Chinese naval task force held military exercises with Cameroon and Nigeria, the first time that the Chinese navy appeared in the west coast of Africa. The world of El Shaddai ' is mesmerizing and beautiful and an amazing place to escape for hours. Another product is an antibiotic foam for treatment of Impetigo, an infectious disease, which is due to begin a Phase III trial after talks with the US Food and Drug Administration (FDA). Hull bottom and sides plus the main deck form the hull girder (upper decks may be included too, when of sufficient longitudinal length) - hence the main deck is also called strength deck. So the stylist draws windows and bulkheads where he wants as compliance to rules and common sense are 'not required'. One thing thats great about flat bottomed sail boats is that when heeled smartly they become a deep V hull.
The name of something should reflect some significant or hopefully dominant feature of the thing to hearld what it is. Since it is just a simple piece of steel and doesn't have any moving parts, it is fairly inexpensive to build, too. Let the rubber cement dry for about 15-20 minutes, and don't be tempted to touch the bottle to check it—it could dislodge the marbles and cause you to have to cement them down again.
Let go of the dowel and record the number of oscillations it makes in a data table, like the one below, in your lab notebook. He alleged that the unit processes used syringes and gloves and transports them to Coimbatore to be sold to medical equipment manufacturing units without proper licence from the DFB. The decision to federate the country into six provinces with tentative demarcation of borders sparked protests in various parts of the country. It's a quiet performance yet so assured that it takes you mere seconds to learn to read his silences. Reid Ribble, a Wisconsin Republican, and his Democratic colleague in the House, Jim Cooper of Tennessee, unveiled a pair of bills back in March that got little notice but could go a long way to making the nation's reapportionment process less partisan. Shapcott is one of the world’s leading researchers on how to effectively market to, and teach, women the game of golf.
The double end boat concept is obviously hard stuck in the grey however there are many double end boats in April Woodenboat Magazine that are 100% double enders. On another note perhaps Mallon might reflect on the cost of investigations into his behaviour that of his ex-colleagues that cost the town a fortune under Lancet! It is the second largest town in North Sinai and the only major population centre remaining in the restive corner of the peninsula, which borders the Gaza Strip and Israel.
Three people were killed and over half a dozen injured in violence that broke out in Surkhet district in mid-western Nepal. Those snooty sailors, with their proper boats, too often, could only see the back end of the 110.
Present at the conference were Prime Minister Sushil Koirala, CPN-UML chairman Jhala Nath Khanal, UCPN (Maoist) chairman Pushpa Kamal Dahal and MJF-L chairman Bijayakumar Gachhadar.
Chaque ann e, les Pays-Bas consacrent plusieurs millions d euros au financement, direct ou indirect, d organisations dont le seul objectif est la diabolisation d Isra l.
If you were addressing a group of stock brokers I'd say you could get away w calling the Fairliner Torpedo a double .. Without the rocker it would be a planing hull but even then it's questionable and w power applied it would clearly be a FD hull. L ambassade isra lienne La Haye et le ministre des Affaires trang res doivent exiger un arr t imm diat de cette campagne subversive et diffamatoire. The IC uses a sliding hiking plank which is highly efficient and I swear it is easier to use than a trapeze.
If you call the Bartender and your boat a double ender the meaning of the expression double ender has been reduced 80%.
It has a full rounded transom and would not go gracefully backwards nor does the stern really look like the bow.

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