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Basketball cannon anyone?

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Basketball cannon anyone?

Unread postAuthor: daberno123 » Sun Mar 07, 2010 2:52 pm

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Unread postAuthor: Gun Freak » Sun Mar 07, 2010 2:59 pm

JSR wants it... :D
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Unread postAuthor: c11man » Sun Mar 07, 2010 3:00 pm

since i can get that size pipe for free i have been tempted but my parents dont allow me to make any sort of a combustion cannon..... :( its depressing
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Unread postAuthor: Gun Freak » Sun Mar 07, 2010 3:04 pm

Lol c11man how old are you?
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Unread postAuthor: jackssmirkingrevenge » Sun Mar 07, 2010 3:38 pm

Gun Freak wrote:JSR wants it... :D


JSR tends to build on the smaller side, but for those of you with the benefit of land over which to shoot, why not;)
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Unread postAuthor: Gun Freak » Sun Mar 07, 2010 4:00 pm

jackssmirkingrevenge wrote:why not;)

DANG. Thats pretty big. :D
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Unread postAuthor: maverik94 » Sun Mar 07, 2010 4:11 pm

DANG. Thats pretty big.

Thats what she said.
Nice...are you planning on buying it?
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Unread postAuthor: daberno123 » Sun Mar 07, 2010 4:26 pm

Not sure yet. I'd love to but I don't really have the space to shoot it (I live in the suburbs). I could take it to a local park I suppose...

Four feet would cost me $86 shipped to where I live. That's manageable but I'm trying to think how often I'd actually get out and shoot it
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Unread postAuthor: jrrdw » Sun Mar 07, 2010 4:45 pm

Maybe you should also add to the equasion how many shots will you get out of each basketball and how many are you willing to buy?
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Unread postAuthor: daberno123 » Sun Mar 07, 2010 5:01 pm

Good point. I wonder how many shots a basketball could take out of a cannon like this?

If I were to build build this, I'd also have to figure out a way to plug one end of it. Since a 10" cap costs several hundred dollars, I'd probably use concrete to cast a base around the pipe, which would make the cannon even harder to transport.
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Unread postAuthor: jrrdw » Sun Mar 07, 2010 5:15 pm

You could build a plug out of wood and seal it with silocone/epoxy/simular and screws to help hold it in.
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Unread postAuthor: c11man » Sun Mar 07, 2010 6:51 pm

i be only 16. i was seriously planning a basketball cannon and THEN i learned of my limitations. as jrrdw mention i was going to make the end out of wood but i never did think of sealing ut up....
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Unread postAuthor: joepage2008x2 » Sun Mar 07, 2010 7:02 pm

I have some plastic sewer pipe sections. 10" PVC 2ft sections, two of them but can get up to 10 for free. I live in UK so a cannon like this would be illegal unfortunately, far too dangerous as the tube is only 1/4" thick and my money at the moment is going in another project so dont have any spare for sealent, im literally 100yards from a field too. I would have made one a few years ago when I never thought of the danger,
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Unread postAuthor: psycix » Wed Mar 10, 2010 8:22 am

10" SCH40....
A quick calculation, comparing 1" sch40 to 10" sch40.

According to wikipedia:
1" SCH40
OD: 33.40 mm
Wall thickness: 3.378 mm
ID: 33.40-(2*3.378) = 26.6 mm
ID:wall ratio: 7.87

10" SCH40
OD: 273.05 mm
Wall: 9.271 mm
ID: 273.05-(2*9.271) = 254 mm
Ratio: 27.4


So the burst pressure of 10" sch40 is...
27.4/7.87=3.84
Almost 4 times LOWER than 1" sch40!

1" sch40 can be used up to, what...? 150 psi?
Then 150/4=37.5 psi
You can use this 10" pipe only up to ~40 psi.


You NEED SCH80 for a simple combustion.
EDIT:
Or metal pipe.
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Last edited by psycix on Wed Mar 10, 2010 3:54 pm, edited 1 time in total.
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Unread postAuthor: DR » Wed Mar 10, 2010 10:24 am

<a href="http://pages.villagephotos.com/page.asp?page_id=3714"><img src="http://old.villagephotos.com/image.asp?id_=16668582"></img></a>
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