Objective:To design a bridge out of toothpicks and glue that has the greatest possible mass to mass supported ratio.
Determine how much weight can be supported by boat hulls of various volumes and how this relates to the density of water. You know from experience that if you drop a steel bolt in a bucket of water that it will sink like a rock to the bottom. If too much cargo or weight is added to the ship, the density of the ship becomes greater than the density of water, and the ship sinks.
In this hydrodynamics science project you will make boat hulls of various shapes and sizes using simple materials (aluminum foil and tape) and determine how much weight can be supported by these hulls and how this relates to the density of water. If a boat is sinking because it has too much cargo, how does its density compare to the density of water? Use the aluminum foil and tape to construct at least five boat hulls with different sizes and shapes. Some different shapes you could try include making the hulls have two pointed ends (like canoes), like the ones on the left in Figure 1, or be square or rectangular (like a rectangular prism), like the ones on the right in Figure 1. Make sure the hulls are not too large to fit in the sink, tub, bucket, or dishpan you will be using.
Some different boat hull shapes you could make include boat hulls that have two pointed ends, like the ones on the left in this image, or boat hulls that are square or rectangular, like the ones on the right in this image. If the hull is a rectangular prism, use the ruler to measure the length, width, and height of the hull in centimeters (cm). If parts of the hull are rectangular prisms but other parts are curved or angled, measure the (imagined) parts of the hull piece-wise (in centimeters), calculate the volume of each part, and add up the volumes to get the total volume for each hull. Being careful not to damage the hull, move the dry rice into the measuring cup (or graduated cylinder).
If this is all of the rice that was in the boat hull, then this is the volume of your boat hull. If there is still rice left in the hull, empty the rice from the measuring cup and fill it with rice from the hull until the hull is empty. The water level should be deeper than the height of the boat hulls so that they are able to sink.
You can make a graph by hand or use a website like Create a Graph to make a graph on the computer and print it. What do your results tell you about the relationship between buoyancy (amount of weight a boat can support) and volume of the boat hull? The density of the hulls right before sinking should roughly be the same as the density of water. You roughly calculated the density of water in this science project, but your calculation could be made even more accurate. Tip: To calculate the average weight of a small item, you can use a scale to find out how much 10 or 20 of the items weigh (together) and calculate the average weight by dividing the total weight by the number of items you weighed. In this science project you investigated the density of water, but what about the density of other liquids? It would be difficult to bring a bathtub to the science fair in order to demonstrate your project, but there is a nice demonstration of buoyancy that you can show in a clear plastic soda bottle— see the DragonflyTV link in the Bibliography in the Background tab. Compared to a typical science class, please tell us how much you learned doing this project.
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Location: Orange County California Best way to glass wood top sides I'm rebuilding a 1968 25' Luhrs flybridge. I always recommend two relatively light layers of fabric (two of 6 ounce cloth, for example), rather then a thick single layer. You're just looking to seal the plywood initially, which a few coats of unthickened epoxy will do. My logic is the first layer forms the waterproofing and the second the abrasion protection (decks get a lot of traffic). Location: Orange County California My end state goal is to have the boat look as if it's all fiberglass just like a modern production boat out of the mold. Jim, the reason I bought all this damn 1708 I now have is because of the mat that's built into it, I didn't feel a preliminary layer of mat was necessary??
I respect your final goal of having a boat that looks like it was a glasstop, only you will be chasing cracks for as long as you own it. Location: NZ Double bias is easiest for compound curves and corners, stringers, floors, bulkhead tabbing. Location: Orange County California Erik- good luck getting that 1708 on your stringers!! Mike, I'm siding with Jim on this one- the guy you got the boat from maybe didn't do such a great job of glassing before he launched, or maybe he used poly or vinyl resin instead of epoxy. When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Remember, the ultimate goal of this project is to create a bridge with the highest mass:mass supported ratio. It is the density (mass per unit volume) of the object compared to the density of the liquid. On an empty ship the hull encloses a volume of air so that the total density is defined by Equation 1 below. If the object is floating, the amount of water that gets displaced weighs at least as much as the object.
It's not as smart as you are, and it may occasionally give humorous, ridiculous, or even annoying results! To prevent the hull from tipping, carefully balance the load as you add pennies (left to right, front and back— or port to starboard, fore and aft, if you are feeling nautical). To do this put the weight supported by the boat (in grams) on the y-axis and the boat hull volume (in cm³) on the x-axis.
To do this put the density before sinking (in grams per cm³) on the y-axis and make a bar for each of the boats (on the x-axis).
For example, waxed half-gallon cartons (for milk or juice) can be cut open and unfolded to produce sheets of waterproof material. NASA's Cassini spacecraft sent the European Space Agency's Huygens probe to the surface of Saturn's moon, Titan, where it found evidence that the surface contains large bodies of liquid methane (Phillips, 2005). 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. Basically, I'm starting from a BARE hull with only stringers, of which 2 out of the four (inboard ones) I'm replacing. This of course offers little abrasion protection, so fabric is used to provide this element. The first layer is applied, over a well faired substrate (plywood), then the weave filled and the second (finish fabric) applied with no attempt to fill the weave.
If using Douglas fur plywood for the decking, then two layers of cloth is my only recommendation, because of its propensity to check.
The prior owner to my luhrs had the same vision, and not only did he get cracks everywhere (these hulls flex a LOT) but the water got into them causing his ply to rot QUICK.
To make folds to create the desired hull shape, first score the material with a blunt stylus-the classic Bic pens with the blue plastic caps have a great shape for this. Our Experts won't do the work for you, but they will make suggestions, offer guidance, and help you troubleshoot.
Materials scientists and engineers develop materials, like metals, ceramics, polymers, and composites, that other engineers need for their designs.
Being that I don't have a warehouse to build a glass one-off liner, I am rebuilding the boat completely out of ply (like the original) and then plan to glass it like the original. In fact, I try very hard to get a very uniform texture on the finial cloth application, with the weave clearly showing, which does simulate a canvas covering reasonably well.
I ended up ripping out all of the plywood on my 32 foot 1968 Luhrs and rebuilding all of the supports with Pressure treated wood with stainless steel screws (I know Ill get lots of flack on this board for using pressure treated) But it has lasted over 10 years and still looks like new! If your boat could float 100 pennies in water, how many pennies would it support (on Earth) in a container filled with liquid methane? MANY THANKS TO SCIENCE BUDDIES FROM THE BOTTOM OF MY HEART!!!!REALLY!YOU GUYS ARE JUST PURE AHHHHMAAAZIINNNNNGGG!!!!
Materials scientists and engineers think atomically (meaning they understand things at the nanoscale level), but they design microscopically (at the level of a microscope), and their materials are used macroscopically (at the level the eye can see). I figure I fix combat helicopters that beat the hell outta the airframe and my patches hold up fine, so a boat will be even better. An actual experiment you could do would be to re-do the experiment with a liquid that has a density different than that of water. From heat shields in space, prosthetic limbs, semiconductors, and sunscreens to snowboards, race cars, hard drives, and baking dishes, materials scientists and engineers make the materials that make life better.
Though the difference in density is not nearly as dramatic as for liquid methane, it is a lot easier to obtain and safer to work with!
I already bought a bunch of 1708 and have about 10 gals left over to glass the wood, but in retrospect, I'm wondering if that is overkill?? How does the buoyancy of each boat hull in vegetable oil (measured by the number of pennies it can support) compare to its buoyancy in water? I would like to not have to buy all new cloth, so aside from the weight factor (neglible) is there any reason why I shouldn't use 1708?



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