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Thread: SKIRT DESIGN

  1. #1
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    Default SKIRT DESIGN

    CAN ANYBODY GIVE ME SOME SKIRT DESIGN TIPS. NOW I HAVE MADE MY SEGMENTS FROM THE CONSTRUCTORS GUIDE. NOW I HAVE HEARD THAT THE CONSTRUCTORS GUIDE DESIGN IS QUITE POOR. MY SKIRT ONCE INFLATED SEEMS TO BE QUITE BAGGY AND ROUNDED AT THE TOP. WHEN I LOOK AT OTHER HOVERS SOME ARE QUITE FLAT AND MORE POINTY A BIT LIKE THE FLYING FISH DESIGN. IS THIS ANGLIA DESIGN BETTER AND MORE EFFITIANT.

    HELP ME

    ANY IDEAS ARE GREATLY EXCEPTED.

    THANKS MARK

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    Default Re: SKIRT DESIGN

    fold the lower attachment tags over pulling the skirt closer to the hull, it will reduce your foot print slightly all around, but the skirt will be less baggy and boucy! the back of the segment wants to be tight against the planning surface.



    this worked wonders on my challenger! and its easy to do!

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    Default Re: SKIRT DESIGN

    thanks for the input sounds good.

    but is it my imagination or am alone in thinking skirt design is shrouded in a bit of secretcy.I can find lots of information on fan design,air flow,formulars,engine choices,hull design ect,but never skirt design.

    when people say the constructors guide to skirt design is poor they never say why it is poor.

    any ideas anybody.

    thanks mark

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    Default Re: SKIRT DESIGN

    its poor cos the lower skirt attachment tags are miles to long, and the skirt is baggy and bouncy, as it does not instruct to make the skirt so its tight against the planning surface.



    not sure if its been updated recently but my old copy is like this, also it show pressure segements, which with the long lower tags, dont really do much. the geometry is not miles off tho.



    i looked at segments of various different craft, before i finally modified the skirt, pulling it tight against the hull, is the major requirement to make it better!



    [img]index.php?t=getfile&id=1540&private=0[/img]



    Baggy!



    [img]index.php?t=getfile&id=1541&private=0[/img]



    not so baggy!
    Attached Images Attached Images

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    Default Re: SKIRT DESIGN

    ahh i see now that sounds logical thanks.

    in my constructors guide perchased in 2002/3 shows 100mm long tags from hull to skirt. would making the skirt sides bigger and reducing the tags to as short as possible do the same thing and that would keep the foot print the same ?

    [img]index.php?t=getfile&id=1542&private=0[/img]

    [img]index.php?t=getfile&id=1543&private=0[/img]
    Attached Images Attached Images

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    Default Re: SKIRT DESIGN

    hi



    nice looking bit of ally



    i would just try shortening the tags first, its quick and simple and should only take a couple of days. it should pull the skirt in 30 to 50mm around around, which will give a higher cushion pressure, which will help anyway! i found the geometery of the skirt was better slightly inbound. if you dont get the desired effect, then unpick the folded over tags and try as you suggest. you might still find the bag lifting up at the top, as it needs to be pulled down towards the lower attachment point.



    do you have pressure segments down the sides? if so i would remove the flaps in the side bags, which will get more air thru and under the skirt. the bouncy bag is more prone to plough in, but you have a front lift engine that will help, also the craft looks like it flies nice a level. Have you had it out on water yet?

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    Default Re: SKIRT DESIGN

    Quote Originally Posted by dangerman


    do you have pressure segments down the sides? if so i would remove the flaps in the side bags, which will get more air thru and under the skirt. the bouncy bag is more prone to plough in, but you have a front lift engine that will help, also the craft looks like it flies nice a level. Have you had it out on water yet?


    So Ideally you want pressure segments at the front of a craft and open along the sides?

    Or would open segments at the front be better than pressure?



    Am I right in thinking that open front segments would allow the air to go under the craft better, but be more likely to collapse at speed over water?



    Jonathan

    aka 'Mr Questions'

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    Default Re: SKIRT DESIGN

    So Ideally you want pressure segments at the front of a craft and open along the sides? YEP!

    Or would open segments at the front be better than pressure? NOPE!



    Am I right in thinking that open front segments would allow the air to go under the craft better, but be more likely to collapse at speed over water? MOST CERTAINLY



    a pressure segment, jet segment or some form of high pressure segment at the front is best to limit plough! open down the sides gets more air under the craft as the pressure segment can limit airflow slightly! certinly the pressure flap has to be right for the craft for it to work properly!



    i found a sealed bag, bit like a chip bag with a small opening at the bottom, so it fills and is firm on the front was better than a pressure segment, im sure others will disagree but a normal pressure segment is not that great at recovering plough, once it happens it happens, in my opinion its best to have a harder segment which limits it happening in the first place.



    will see if i can dig out some pics of what i mean!




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