SpudFiles

SEAKING9006 wrote:Also, check your state and local laws. I limit myself to pneumatics because combustions must be registered as firearms in Texas, though if you can avoid getting caught (read as 'have tons of land') you can get away with plenty of stuff. Appearing to be a college engineering student also helps.

Can you provide us with where its states that combustion spud cannons need to be registered as a firearm? thanks

daberno123 wrote:Sorry, throw it out and start from scratch. A pressure rated PVC or ABS chamber is only a few bucks anyways. Think of as an investment in safety.

I agree. It might be little challenging to round up the pressure rated 4" but it is very doable.

Solid-core DWV PVC and cellular core ABS have been used for building combustion launchers for years. Indeed, anybody who has ever used a cleanout cap on a combustion launcher has used DWV PVC before (or ABS).

It irritates me to see so much fear-mongering in threads like these. As long as you glued the joints correctly (read below) your cannon will be fine.

However, you said you used primer. ABS glues together with ABS cement and nothing else. No primer involved.

There is an article on eithewer the spudding wiki or wikipedia on the leaglity of spudguns. Pay a visit to a pro-gun rights website and find your states gun laws, there should be a clause in the 'destructive devices' section that specifically mentions spudguns or potato guns. If that fails, check with your local law enforcement agency.

SEAKING9006 wrote:There is an article on eithewer the spudding wiki or wikipedia on the leaglity of spudguns. Pay a visit to a pro-gun rights website and find your states gun laws, there should be a clause in the 'destructive devices' section that specifically mentions spudguns or potato guns. If that fails, check with your local law enforcement agency.

Actually I was inquiring about your law. I have heard about the Texas law, but never seen the actual state legislation outlining it. Preliminary google searches have not brought much up... one article states they are considered a "Zip" gun.

Fire the damn thing. Better yet get your husband to do it for ya

i ran some tests about the damage shrapnel does. however those are the only pictures i uploaded before formatting my computer.

steel: when i blasted steel pipes causing hypersonic shrapnel you can think of what it could do. atleast the same penetration as a armour piercing round from a .30 cal.
the powder used has a "flame" front that travels between 4000m/s and 5400m/s and the shrapnel gets just about all the energy since that is the only place the gasses can go.

Aluminium: it was sort of what i expected, a 3mm thick piece of pipe does what the picture shows in that speed.

http://i250.photobucket.com/albums/gg26 ... C00782.jpg

http://i250.photobucket.com/albums/gg26 ... C00781.jpg

PVC: no damage found.

if anyone can tell me a more exact speed of shrapnel i will know.

this may not relate to the topic but its just a comparison. PVC shrapnel did not do anything to the tree when exposed to a 25.000psi pressure wave traveling at REALLY high speeds.

my conclusion is to wrap that thing in blankets and fire it from a small distance, shrapnel wont penetrate blankets since it has no space to get its speed. just be pressed against the blankets inside.

mabe you could use it to get a more accurate description of shrapnel? blast it with a 3x hybrid mix and look at the damage. this requires remote control though.


a note: in Norway we cant get solid pressurerated PVC so the pipe used had a diameter of 2" and a wall thickness of 1mm. it's also pretty soft but the explosive used had a good bristance so it did make shrapnel that i could recover.


i bet no one read the whole post just felt like telling it since everyone has so much questions about shrapnel.

i read it all spudfarm and looked at the pics, jeez that second bit od scrapnel split the wood!

yeah, metalls is a no-good if you are blasting them.