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  • MDPE hoop size??

    HI Guys,

    right I need a advice on hoop size? im building a diy poly tunnel. I have a 10ft wide bed which the hoop needs to cross. I plan to have 3ft straight sides before the hoop goes over to the other side. soooooooo the big question is how long does the MDPE pipe need to be cut? I sure someone will just work it out quickly, but I cant get my head round it. don't want to waste it by cutting it to short. lol

  • #2
    22feet (21.7 if you want to be more accurate)


    Sent from my iPhone using Grow Your Own Forum mobile app

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    • #3
      I just knew there would be someone who could work it out! Thank you!

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      • #4
        3ft+3ft for verticals =6ft

        Half circle is as follows

        22/7 x 10/2( pi x d/2)
        =220/14
        =15.71428571428571

        Add two together
        =6+15.71428571428571
        =21.7ft then convert decimal places to inches
        Near as beep 21ft 8,5inches
        Never test the depth of the water with both feet

        The only reason people get lost in thought is because it's unfamiliar territory....

        Always remember you're unique, just like everyone else.

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        • #5
          I want to know how your going to get the pipe to go from the three foot sraight sides into a curve then back to a straight side again?
          I would expect it to form an eclipse.
          "...Very dark, is the other side, very dark."

          "Shut up, Yoda. Just eat your toast."

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          • #6
            Stakes driven into the ground that protrude 3ft is One way.....
            Never test the depth of the water with both feet

            The only reason people get lost in thought is because it's unfamiliar territory....

            Always remember you're unique, just like everyone else.

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            • #7
              Be aware when using longer lengths that they can sort of bend in & out, I had a begger of a job when I made the walk in Brassica cage & my hoops were only 13 foot.
              sigpic“Gorillas are very intelligent, but they don't have to be as delicate as chimps -- they can just smash open the termite nest,”
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              • #8
                I make the straight sides I have treated broom handles. These fit perfectly into the 32mm MDPE pipe. Then these fit straight into 7ft scaffold poles I have put 4ft into the ground already. Thanks you the input guys much appreciated. :-)

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                • #9
                  don't forget to use heat tape on all the pole and pipes
                  "...Very dark, is the other side, very dark."

                  "Shut up, Yoda. Just eat your toast."

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                  • #10
                    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.

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                    • #11
                      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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                      • #12
                        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
                        sigpic
                        . .......Man Vs Slug
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                        • #13
                          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.

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                          • #14
                            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.

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                            • #15
                              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.

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