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Thread: MDPE hoop size??

  1. #9
    Olorin2001 is offline Rooter
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    don't forget to use heat tape on all the pole and pipes
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  2. #10
    gardening_gal is offline Cropper
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    Is it the done thing to bump an old thread or should I have started a new one?

    Anyway, I have the same question as the OP. Only I don't understand the answer they got.

    How do I work out how much pipe to cut? I have a little plastic raised bed. It's only 50cm across by 100cm long. I want to put strawberries in it and put a couple of hoops over it, with mesh on, to keep the neighbour cats out and also the birds.

    It doesn't need to be high, the bed is 25cm deep so part of the pipe would be stuck down that much inside the bed. I'm thinking maybe 2 foot high? Does that sound right? Wrong? Is that tall enough to cover strawbs?

    RedThorn explained the workings earlier in the thread but I don't understand where the 22/7 and the 10/2 bit came from so I have no idea how to use those workings but with my figures.

  3. #11
    Lardman is offline Rooter
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    For the example to work the dome height can't be more than the bed width. The dome height starts after the vertical sections.

    In your example.

    Bed width :50cm
    Dome height 50cm
    Vertical height 20cm

    Circumference = 314cm
    Dome plastic (314/2) = 157cm
    Verticals : 20x2 = 40cm
    Total = 157+40 = 197cm

    I'd add another 4" to that so the dome starts 4" above the bed. 197 + 20 = 217cm

    If someone would like to check my maths
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  4. #12
    Cadalot's Avatar
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    Normally I put a link to a posting on my blog where I explain how to work this out will illustrations but since having my wrist slapped for doing so I no longer do that kind of thing
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  5. #13
    gardening_gal is offline Cropper
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    Quote Originally Posted by Cadalot View Post
    Normally I put a link to a posting on my blog where I explain how to work this out will illustrations but since having my wrist slapped for doing so I no longer do that kind of thing
    With illustrations. Now you are talking my language.

  6. #14
    gardening_gal is offline Cropper
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    Quote Originally Posted by Lardman View Post
    For the example to work the dome height can't be more than the bed width. The dome height starts after the vertical sections.

    In your example.

    Bed width :50cm
    Dome height 50cm
    Vertical height 20cm

    Circumference = 314cm
    Dome plastic (314/2) = 157cm
    Verticals : 20x2 = 40cm
    Total = 157+40 = 197cm

    I'd add another 4" to that so the dome starts 4" above the bed. 197 + 20 = 217cm

    If someone would like to check my maths
    Thanks for taking the time Lardman, really appreciated.

  7. #15
    gardening_gal is offline Cropper
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    Quote Originally Posted by Lardman View Post
    For the example to work the dome height can't be more than the bed width. The dome height starts after the vertical sections.

    In your example.

    Bed width :50cm
    Dome height 50cm
    Vertical height 20cm

    Circumference = 314cm
    Dome plastic (314/2) = 157cm
    Verticals : 20x2 = 40cm
    Total = 157+40 = 197cm

    I'd add another 4" to that so the dome starts 4" above the bed. 197 + 20 = 217cm

    If someone would like to check my maths
    Still confused.

    If the bed width is 50cm and you times that by 3.14 to find the circumference, that would be 157. But that is for the whole circle? Not just the top arc bit that I need? So would it not be 157 halved?

    So 78.5 plus 20 + 20 for verticals = 118.5.

    I hated maths at school, I was very bad at it.

  8. #16
    Lardman is offline Rooter
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    I was just testing you

    I used d rather than r for the circumference calculation. r = d/2. 157/2 +40 = 118.5

    I blame cadalot for not checking my maths.
    Last edited by Lardman; 06-03-2019 at 04:31 PM.

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