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4inch coax predictions?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: mopherman » Fri Jun 08, 2007 11:24 pm

Ill probably end up just going at it with my dremmle and a grinding wheel.
also, what kind of bumper did you use? or did you?
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Unread postAuthor: turbohacker » Fri Jun 08, 2007 11:35 pm

I have fired it over 50 times with no bumper and it still works great. Ive evn taken it to 165 PSI!! and it didnt blow the valve, but holy sh*t was it crazy!!(i shot a 2" hole saw out of it and it went through 3 pieses of 1/2: plywood and then put a gouge in my cinderblock wall :shock: :twisted:
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If it walks like a dog, sratches like a dog, and barks like a dog, than its probobly a...-TURTLE, it's a TURTLE!!! Cant you see?!!!

frankrede wrote:Great googlay mooglay!
Thats a beast!
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Unread postAuthor: mopherman » Fri Jun 08, 2007 11:39 pm

nice, cant wait to get started
ima hit the sack 11:43
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Unread postAuthor: jackssmirkingrevenge » Sat Jun 09, 2007 12:07 am

rna_duelers wrote:@jackssmirk-A .44 magnum,thats getting out of hand!You gave me links to a website with caluclators to find the muzzle energy of projectile and I can't seem to find them.If you could be as good to post the link that would great.Wanting to find the energy of some of my pneumatics :wink: .


Easy to use muzzle energy calculator can be found here, though I prefer to use this one as it plots a graph of muzzle energy for the whole velocity range and gives ft/lbs to 2 decimal places.

To see how muzzle energy compares with firearm ballistics, a detailed range of popular cartridge statistics (velocity, weight, muzzle energy etc) can be found here
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Unread postAuthor: jackssmirkingrevenge » Sat Jun 09, 2007 12:08 am

turbohacker wrote:I have fired it over 50 times with no bumper and it still works great.


It's only a matter of time, you should fit at least a neoprene disk.
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Unread postAuthor: pyromaniac » Sat Jun 09, 2007 12:12 am

rna_duelers wrote:Ahh yes an 3"endcap,fill it with space filling foam or similar to reduce the pilot volume.Haha I wouldn't shoot something like that in town or a city thats a little crazy and could see something bad happening..


hows 20 acers of farm land?
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Unread postAuthor: mopherman » Sat Jun 09, 2007 12:17 am

pyromaniac wrote:
rna_duelers wrote:Ahh yes an 3"endcap,fill it with space filling foam or similar to reduce the pilot volume.Haha I wouldn't shoot something like that in town or a city thats a little crazy and could see something bad happening..


hows 20 acers of farm land?

looks like thats gonna be its permanant home. still got that computor monitor?
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Unread postAuthor: pyromaniac » Sat Jun 09, 2007 12:21 am

Yup :). ill need to get you down more often. once we finish it that is.

the empty caulk tubes are light though. We may need to fill them with something.
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Unread postAuthor: jackssmirkingrevenge » Sat Jun 09, 2007 12:23 am

the empty caulk tubes are light though. We may need to fill them with something.


fill the first 1/4th of the tube with concrete and you have a perfect drag-stabilised armor piercing shot :)
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Unread postAuthor: mopherman » Sat Jun 09, 2007 12:24 am

1/4 full are supposed to be pretty accurate. well, as accurate as you can get out of a high velosity cardboard tube. how about we weight them with sand?
edit: jack beat me to it
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Last edited by mopherman on Sat Jun 09, 2007 12:25 am, edited 1 time in total.
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Unread postAuthor: jackssmirkingrevenge » Sat Jun 09, 2007 12:24 am

mopherman wrote:how about we weight them with sand?


Sand mixed with some elmers glue would make a good concrete substitute too ;)
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Unread postAuthor: mopherman » Sat Jun 09, 2007 12:27 am

jackssmirkingrevenge wrote:
mopherman wrote:how about we weight them with sand?


Sand mixed with some elmers glue would make a good concrete substitute too ;)

i actualy like the concrete idea more. glue sounds messy. btw thanks for the imput guys!
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Unread postAuthor: jackssmirkingrevenge » Sat Jun 09, 2007 12:36 am

sand and glue isn't going to be any more messy than mixing concrete.

Another good idea would be to use the empty caulk tube as a sabot, with that sort of power on tap it would make a killer shotgun with marbles.
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Unread postAuthor: mopherman » Sat Jun 09, 2007 12:38 am

or golf balls with wadding or a sabbot
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Unread postAuthor: jackssmirkingrevenge » Sat Jun 09, 2007 12:43 am

or a single golf ball at high velocity :D but don't let these ideas run away with you, don't forget you have to go out and build the thing first ;)
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