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Engineering student Jessica Guantone of Lodi helps college team win concrete canoe competition

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  • Ted Lauchland posted at 2:48 pm on Mon, Jul 7, 2014.

    Ted Lauchland Posts: 261

    There is a concrete ship permanently grounded at the end of a pier at Seacliff beach in the Santa Cruz area.

  • Jerome Kinderman posted at 12:00 pm on Mon, Jul 7, 2014.

    Jerome R Kinderman Posts: 2370

    Some may not know this but at one point there was a fleet of "concrete" ships. Of course owing to the porousness of the substance and how they reacted to salt water (among other problems), they weren't the best idea. But they did float.

    I recall when living on the east coast visiting Cape May, New Jersey this very strange half-sunk concrete ship off of its southern point. While it still exists, the elements have been eating away at it for a very long time. Mr. Locke might find it interesting at: http://www.concreteships.org/ships/ww1/atlantus/.

  • Mike Adams posted at 6:07 pm on Sun, Jul 6, 2014.

    Mike Adams Posts: 1574

    I think Ms. Guantone just doesn't have buoyancy figured out yet. You're absolutely right in your response. I think she's coming from the direction that the air filled spaces provide the actual buoyancy, like a foam ice chest floats. Well the styrofoam ice chest floats with or without the top on. A more advanced ice chest floats well also, minus all the extra air spaces that styrofoam provides. So does a refrigerator for that matter.

    I'm sure at some point she'll "duh....it's not the air spaces, it's the shape and design!!"

  • Jim Locke posted at 2:06 pm on Sat, Jul 5, 2014.

    Jim Locke Posts: 1

    I must take exception to a statement in the Q & A portion of the article.
    The Question: How can Concrete float? The response was very mis-leading and inappropriate. The "Student" responded with "it is all in the mixture", which is hardly the reality. Virtually any material will float given the proper "water displacement volume", such as glass, wood, metal, concrete of various mixtures that do not allow water to come inside the hull. The issue is all about buoyancy, not the glass spheres being cited. A lighter weight of concrete mixture will allow a given hull shape to ride higher in the water, but in itself is not the fundamental controlling factor. A lighter weight canoe will be easier to hand carry to and from the water and easier to paddle in the water…………… but, that doe not make if float.
    Jim Locke, Graduate Engineer, Cal Poly San Luis Obispo , 1959



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