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Rangerkris · « **on:** July 20, 2011, 19:33 »

For the bend on tubing to make a poly tunnel 8ft wide how long would the tube need to be, im thinking of using the tube i have had on the plot for months to try and make a poly tunnel or do i just weigh it all in at the scrap yard and put the money towards a good one.

Ice · « **Reply #1 on:** July 20, 2011, 20:16 »

C = pi x diameter.

arugula · « **Reply #2 on:** July 20, 2011, 20:17 »

Your tube length will also depend on the desired height of your tunnel Kris. You could build yourself a sturdy polytunnel if you source suitable materials or you could buy a decent one for, what, a few hundred pounds upwards?

Ice · « **Reply #3 on:** July 20, 2011, 20:24 »

C = 3.142 x 8 = 24.992 divide by two = 12.496 minimum pipe. Add extra for more height as that gives an apex of four foot. An extra four foot would give a six foot apex. if you see what I mean.

mumofstig · « **Reply #4 on:** July 20, 2011, 21:41 »

This link gives instructions for building one
http://www.overthegardengate.net/UserPages/pp_view.asp?FName=polytunnel&Page=1

and it says you need 19ft lengths for a 10ft wide tunnel with a height at the apex of about 8ft..thought it might give you some idea

arugula · « **Reply #5 on:** July 21, 2011, 07:24 »

This one has 3 metre lengths of pipe - 19 feet is very roughly twice that...

http://chat.allotment-garden.org/index.php?topic=46130.msg543885#msg543885

whiskywill · « **Reply #6 on:** July 21, 2011, 13:10 »

Quote from: mumofstig on July 20, 2011, 21:41

This link gives instructions for building one
http://www.overthegardengate.net/UserPages/pp_view.asp?FName=polytunnel&Page=1

and it says you need 19ft lengths for a 10ft wide tunnel with a height at the apex of about 8ft..thought it might give you some idea

But the bent plastic tube is on top of straight scaffolding poles. To get a headroom of 8ft without the scaffolding poles, you would need a pipe of 21 ft 8 inches. A 19ft length would give an apex of just under 6ft 8 inches.

Rangerkris · « **Reply #7 on:** July 24, 2011, 06:51 »

Thanks fine people, i might just get 19ft if i have 2 tubes bent and welded together. But then i did bid and offer �50 for a 25m x 12m frame and they might take it i got and hour or so to make up my mind i guess this would make a tunnel for me and one for my dad. Im really not sure what to do at the moment

I would have 2 green house's to sell if i went with the tunnel idea and a lot more space to grow in side.

Rangerkris · « **Reply #8 on:** July 26, 2011, 07:00 »

Update i thought about the tunnel frame and said no to �50

then just got an email saying they would take �40

I am made up as it will be a great help having the tunnel and giving me a longer growing season and more exotic species to grow.

Rangerkris · « **Reply #9 on:** August 03, 2011, 14:19 »

Quote from: Rangerkris on July 24, 2011, 06:51

Thanks fine people, i might just get 19ft if i have 2 tubes bent and welded together. But then i did bid and offer �50 for a 25m x 12m frame and they might take it i got and hour or so to make up my mind i guess this would make a tunnel for me and one for my dad. Im really not sure what to do at the moment I would have 2 green house's to sell if i went with the tunnel idea and a lot more space to grow in side.

What a donut its 12ft by 25 ft

mumofstig · « **Reply #10 on:** August 03, 2011, 14:33 »

I thought that was too good to be true

Still a huge size to fill, kris

Rangerkris · « **Reply #11 on:** August 03, 2011, 18:43 »

Well its like this i can gain permission from the allotment officer

with an email for any size i want. Its is very big for an allotment. Do i see if i can cut it down in size in width or just go for it as it is the cover will be about �130 not to bad as i sold the 4x6 greenhouse for the cost of the frame. The 8x6 will give me a good amount towards the cover for the tunnel if i can sell it

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