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Judge Dredd

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: jackssmirkingrevenge » Sat Jan 02, 2010 2:37 am

Insomniac wrote:Indeed, some would even go so far as to say that it is required.


As in this case, for the 1" barrel the equivalent length of 3" chamber has 9 times the volume, so in this case chamber to barrel ratio is a massive 4.5:1, talk about overkill :D
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Unread postAuthor: Davidvaini » Sat Jan 02, 2010 2:49 am

Image

Taking colors from the picture, I found these to be the most common...

The picture of course being judge dredd.
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Unread postAuthor: Insomniac » Sat Jan 02, 2010 3:05 am

jackssmirkingrevenge wrote:
Insomniac wrote:Indeed, some would even go so far as to say that it is required.


As in this case, for the 1" barrel the equivalent length of 3" chamber has 9 times the volume, so in this case chamber to barrel ratio is a massive 4.5:1, talk about overkill :D


Yes, but the chamber still has the same volume as the chamber. :wink:
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Add me on msn!!! insomniac-55@hotmail.com
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Unread postAuthor: jackssmirkingrevenge » Sat Jan 02, 2010 3:10 am

Insomniac wrote:Yes, but the chamber still has the same volume as the chamber. :wink:


*blink*

Duly edited *sigh* :roll: :?
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Unread postAuthor: tonnor » Sat Jan 02, 2010 3:09 pm

Thanks for the help.But still have questions.Is two feet long enuf to launch a tennis ball.Is twice the volume of the barrel enuf or to much.I seen a launcher for tennis balls to raise antennas and he is using 16 ''barrel at 2.5'' and 8'' comb at 4''.He claims 100 to 150 feet.Would a longer barrel longer comb chamber make a difference.I am looking at geardogs post from 11/13/2009 and this is about the idea i had or mine.Does it work well and how long of a barrel and comb chamber did you use.thanks again
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Unread postAuthor: velocity3x » Sat Jan 02, 2010 4:56 pm

Insomniac wrote:
jackssmirkingrevenge wrote:
Insomniac wrote:Yes, but the chamber still has the same volume as the chamber. :wink:


That make sense to me but.... I live on the west side of the equator where everything makes sense.
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Unread postAuthor: Ragnarok » Sat Jan 02, 2010 5:04 pm

velocity3x wrote:That make sense to me but.... I live on the west side of the equator where everything makes sense.

Including the phrase "West of the equator", apparently.
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Unread postAuthor: ramses » Sat Jan 02, 2010 5:37 pm

Ragnarok wrote:
velocity3x wrote:That make sense to me but.... I live on the west side of the equator where everything makes sense.

Including the phrase "West of the equator", apparently.


pwnd!!!

Anyway, about your the longer barrel and or chamber, a longer barrel is almost always more powerful, as is a larger chamber. Eventually, you run into diminishing returns, especially in terms of range. At the extreme end, you will get a few feet extra range from a few more feet of barrel.

I recommend GGDT.
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Unread postAuthor: jackssmirkingrevenge » Sat Jan 02, 2010 7:35 pm

Ragnarok wrote:
velocity3x wrote:That make sense to me but.... I live on the west side of the equator where everything makes sense.

Including the phrase "West of the equator", apparently.


Genuinely pwnd! :D
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Unread postAuthor: velocity3x » Sat Jan 02, 2010 10:29 pm

Ragnarok wrote:Including the phrase "West of the equator", apparently.


ramses .....pwnd!!!



jackssmirkingrevenge..... Genuinely pwnd!


As I've been a Civil Engineer for 39 years, I assure you that I'm quite aware of the magnetic bearing of the equator but, this is the first time ANYONE has EVER taken my "west" statement seriously. I didn't think it was possible until now, however... I do thank you for stepping up to enlighten me.....lol :P :lol: :lol:
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Unread postAuthor: jackssmirkingrevenge » Sun Jan 03, 2010 1:14 am

velocity3x wrote:this is the first time ANYONE has EVER taken my "west" statement seriously.


Trust spudfiles to provide a loving home to the sort of pedants who would notice :D I love this site :)
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Unread postAuthor: MrCrowley » Sun Jan 03, 2010 1:24 am

The dangers of not using an emoticon... :roll:
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Unread postAuthor: Ragnarok » Sun Jan 03, 2010 4:07 pm

velocity3x wrote:this is the first time ANYONE has EVER taken my "west" statement seriously.

If you were counting on no-one taking it seriously on the basis that it sounded too ridiculous for anyone to actually say seriously - I should tell you that I've heard people say far stupider things and mean them.
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Unread postAuthor: tonnor » Sun Jan 03, 2010 7:39 pm

Me again back from lowes and the local hardware store.They do not sell 4 inch pressure rated pvc only foam core which i believe wont work.Is this correct?I figure i need about 16 inches for my air chamber.Anyone have any ideas?I bought the largest pressure rated pvc which is 1.5 inch.Now with a 24 inch 2.5 barell i will have to run three lengths to make up for no 4 inch.I think this will look dumb.Can anyone enlighten me on how else to do this .Thanks again.
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