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Thread: General stability equations

  1. #9
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    Default Re: General stability equations

    I've scraped MK1



    I now working on MK2



    Hear some photo's MK1 and MK2



    thanks





    David







    mark 1

    [img]index.php?t=getfile&id=2151&private=0[/img]
    Attached Images Attached Images

  2. #10
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    Default Re: General stability equations

    David, I think the problem was too high and no 45 degree angle. I kind of expected larger images showing the details you know are in question, so I'm just guessing blind.



    I like what I see so far in the MkII, where did you source the fans and fan housings from? Can you provide a link or detailed picture?



    Here are some pictures of what I think is good documentation, a standard for all to strive for.



    Link-1

    http://www.astounding.org.uk/ian/index.html



    Link-2

    http://www.model-hovercraft.com/trou...ubleskirt.html



    Link-3 (Mark Porter)

    http://www.model-hovercraft.com/srn6...6mk6skirt.html








  3. #11
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    Default Re: General stability equations

    I've given this more thought.



    As seen in the first posted diagram there is a web between the skirt and plenum chamber beneath the craft. Does this web have holes in it, is it constant? It needs to allow air flow to the middle of the craft.



    To get any hovercraft to work there must be a capture bubble of pressurized air "under" the craft. This is what really supports the craft, not the fabric curtain all around it. The curtain is just supposed to hold in the air so that it maintains a lift pressure.



    Two solutions:



    1. Angle in the fingers so that the flow of air gets under the craft and builds lift pressure.



    2. Provide a second or direct air (shaft) path from the fan to the plenum chamber under the craft.



    NOTE: The point where the fingers touch the ground should NOT be outside of the edge of the hull above or it will give in, deform and not recover.

  4. #12
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    Default Re: General stability equations

    The fans are from a ford escort they are 12 volt and pull 15amps



    I did a freezer bag test to see what they could support and it was 10kg with both fans and 5 Kg with just 1 fan



    It should way about 3 kg with the batteries












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