View Full Version : Idaho's Finest at 300 ft./second

07-09-06, 05:33 PM
OK, so I got bored. $30 at Menard's and a few sacks of spuds as well as my 50 pounds of onions.


I started with hairspray. That lasted about 5 minutes. Then came carb cleaner. Again, whimpy! Now, I only use the good stuff. I'd love to find a small bottle of acetylene, but MAPP gas is $7.00 a bottle, I'd hate to think how much torch-water goes for!


25 to 30 seconds of MAPP gas gives the 40" combustion chamber enough power to shoot one of Idaho's finest hundreds of feet, and the 32" barrel is decently accurate.


I used regular-strength PVC tubing with high-strength glue. I can feel the combustion chamber flex a little during ignition, so if I find acetylene, I'll be upgrading to high-strength PVC for sure. The videos were shot at 11:00 PM last night at Ruthie's folk's place. The little mic on the camera doesn't do it justice. When I'm holding the Painkiller, it has a sound much more like a moderate-caliber hunting rifle, maybe a 308. Very loud. If I spray a little WD-40 down the barrel before I load the spud, I can get some pretty good flames coming out of the barrel. I'm working on a spark-plug ignition right now. Should make things a little quicker!



07-09-06, 06:52 PM
I made several of those back before they became illegal as hell. :hide: ;)

Eric Kahn
07-09-06, 07:11 PM
Is that a state law as they are not illegal by fed law, infact, the batf has ruled that they are not even firearms

mine uses compressed air, explosions and PVC do not mix well with me

07-09-06, 08:00 PM
Where does one find a hat like that Brian? I may need to pick one up sometime.

07-09-06, 08:01 PM
Awesome!! :thumbsup: :worship:

07-09-06, 08:03 PM
Is that a state law

Probably. You can imagine what Arkansans did with potato guns to get them outlawed. :rolleyes:

ETA: it would be interesting to make a paintball cannon out of one of those babies, using a couple dozen projectiles. :p

07-09-06, 08:50 PM
Where does one find a hat like that Brian? I may need to pick one up sometime.

I pick them up on vacations. I have several. This one though, I got at a Gander Mountain that was closing.

07-09-06, 09:01 PM


07-09-06, 09:07 PM
who in the hell is that dude that looks like a cross between crocodile dundee and a disgruntled potato farmer?

im with elvis , lets see you bag a armadillo with the spud cannon ...

i gotta sick fascination with vegitables crossing the 300 ft per second barrer ....punkin chuckin is something i wanna do next

07-09-06, 09:09 PM
Do not use acetylene and oxygen in that thing or anything made of plastic!!!!PVC will shatter under those pressures.Stick with the hair spray,I would duct-tape the $hit out of that thing incase is scatters.

07-09-06, 09:12 PM
I wanna know more about how you get the gas into the chamber and how you ignite it. I've never seen one of these things before.

I'm sure Al Gore doesn't visit this site, so I don't think you have anything to worry about.

07-09-06, 09:22 PM
Potatoes are good, but cucumbers would be funnier! :sneaky:

07-09-06, 09:36 PM
Hell, if it's "oblongular" in nature, we can shove it in there! Boom baby! Elvis, regarding your question, it's pretty easy to put the gas in. I used a standard 4" end-cap that screws into place, and drilled a hole in the middle. Then, I took parts from a barbecue igniter. The igniter had a tapered metal tip about 3 inches long that goes from about 9/16th of an inch at the base to about 3/8th of an inch at the top. It's all hollow, and where the actual spark takes place on the igniter. I removed this metal piece from the igniter and siliconed it into the hole in the bottom of the screw cap. Now, I just stick the MAPP gas with the igniter (pictured on page 1) into the bottom of the screw cap into the little metal piece from the barbecue igniter. Because it's tapered, the MAPP lighter goes in as far as it needs to. I press the button half-way to fill the MAPP gas and then press the button all the way to ignite.

07-09-06, 09:36 PM
BTW, Stoney, you've added a permanent mark to my sig. I owe you!

07-09-06, 10:21 PM
So the "click click click" I hear before detonation are really failed igniter attempts.

I get it. Thx.

Don't shoot your eye out. :nono:

07-09-06, 10:31 PM
elvis , gore might stop by , he inveted the internet you know ...

90brogham , i feel honored to join the ranks of my heros like general patton who are quoted on internet forums. I shall live in imfamy .... or untill the page quits loading ....

07-10-06, 12:13 PM
Hey Brian you've got to bring that to the next meet!! We'll sure as hell save our parking spaces then. :D

07-10-06, 01:06 PM
Brian, we'll go back to that driving range and fire those at those old Fords! :D :sneaky: :lildevil:

07-10-06, 02:06 PM
Brian, we'll go back to that driving range and fire those at those old Fords! :D :sneaky: :lildevil:

Funny you mention driving range in the potato gun forum. We used to cut up old rags to act like wadding, and jam golf balls into our potato guns. With a decent charge of white rain hairspray a golf ball will travel 300-400 yards.

07-10-06, 03:31 PM
Hehehe :lildevil:

07-10-06, 03:34 PM
Hahaha, I haven't tried golf balls yet, but I was pretty successful with some rags and a metal pole. It's still sticking in a tree in my dad's back yard about 4 inches.:alchi: