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    VanceVoj's Avatar
    VanceVoj Posts: 1, Reputation: 1
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    #1

    Mar 9, 2018, 09:50 PM
    Science Fair Not -Working vacuum
    Hello, I am in the 7th grade do a science fair this year. I am making a vacuum cleaner, I used an average sized small plastic box, and a 12V computer fan. I also have a plastic tube that I shortened for the sake of making it not have to suck from so far away. My problem is, is that I cannot make it have enough power, I am positive it is getting 12 Volts of power from my 12V batter I got at ACE Hardware the other day. But it sucks little to nothing, I put it in backwards the way it sucks in. I am very stuck and it is due on Wednesday but I really need it done this weekend, help me please. Any thoughts or suggestions help!
    Fr_Chuck's Avatar
    Fr_Chuck Posts: 81,292, Reputation: 7691
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    #2

    Mar 10, 2018, 05:51 AM
    It would appear that the box is too big? There is not a good seal on all parts?
    The fan, running on battery is not powerful enough to created the air flow needed?
    talaniman's Avatar
    talaniman Posts: 54,010, Reputation: 10852
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    #3

    Mar 10, 2018, 06:10 AM
    Get a bigger fan. That may require a bigger power source also.
    smoothy's Avatar
    smoothy Posts: 25,495, Reputation: 2853
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    #4

    Mar 10, 2018, 06:14 AM
    Fans are rated in cubic feet per minute. You can't create suction unless you can move enough air, and control that air.
    ma0641's Avatar
    ma0641 Posts: 15,681, Reputation: 1012
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    #5

    Mar 11, 2018, 06:05 PM
    The fan you have is an open axial flow fan, will not develop enough static pressure. You need a closed axial like a vacuum cleaner or centrifugal fan. Plus, you need a high volume fan. A computer fan will not work.

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