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My Fun Project

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  • My Fun Project

    I've been living on the water for a few years now, and decided I needed a means to get out on the lake.

    But I'm not a boat guy; I see those poor bastards winterizing their boats, summerizing their boat; and basically dumping cash into a hole in the water.

    And I'm a year-round kind of guy, so a boat wasn't going to cut it...

    So, I'm building a hovercraft. Here's the first round of pics - hull construction.

    It will 15' long, 8' wide, and carry a 700-1000lb payload 11" above the water or ground.












    Attached Files

  • #2
    Very cool!

    How are you going to power it?
    "Faith is nothing but a firm assent of the mind : which, if it be regulated, as is our duty, cannot be afforded to anything but upon good reason, and so cannot be opposite to it."

    -John Locke

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    • #3
      Got my hands on a Kawasaki KZ750 engine and rebuilt it.

      It's good for 75-80hp for a thrust propeller.

      For lift, a 15hp Briggs & Stratton lawnmower engine.

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      • #4
        Way cool!! Love the concept.
        If it pays, it stays

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        • #5
          So cool!!
          Not where I breathe, but where I love, I live...
          Robert Southwell, S.J.

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          • #6
            Awesome.

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            • #7
              Very cool.
              May we raise children who love the unloved things - the dandelion, the worm, the spiderlings.
              Children who sense the rose needs the thorn and run into rainswept days the same way they turn towards the sun...
              And when they're grown and someone has to speak for those who have no voice,
              may they draw upon that wilder bond, those days of tending tender things and be the one.

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              • #8
                Originally posted by ReinMan View Post
                Got my hands on a Kawasaki KZ750 engine and rebuilt it.

                It's good for 75-80hp for a thrust propeller.

                For lift, a 15hp Briggs & Stratton lawnmower engine.
                That's all you need for lift?

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                • #9
                  Originally posted by deudyurondame View Post
                  That's all you need for lift?
                  Makes sense to me, with a skirt. You only need a fraction of an inch of air for "lift," and spread out over a relatively large area, I would think that the "lift" fan would have a multiplicative effect, rather like a very large piston in a hydraulic system pushed by a very small piston.
                  Bask in the warmth of the Deep South
                  No one will be denied:
                  Big law suits and bathroom toots;
                  We're all getting Dixie-fried.
                  But somewhere Hank and Lefty
                  Are rollin' in their graves
                  While kudzu vines grow over signs that read "Jesus Saves."

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                  • #10
                    It's all about cfm for lift.

                    Static pressure under the skirt will be measured in tenths of psi.

                    The cfm requirement is about 8,000 cfm for a 1/2" gap. The relationship is not linear, however.

                    Airflow required will quadruple to double that gap, and horsepower increases as a cube function...

                    Essentially you calculate cushion pressure as weight/area; then gap area as perimeter x gap; and arrive at a velocity of air through the gap required to create the pressure drop equal to the cushion pressure.

                    Velocity x gap area then equals cubic feet per minute air flow required.

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