Lol. That's an "Advanced Combustion Potato Cannon". I have some vids that describe how it works that should help. If you have a decent plumbing warehouse near you, a few bucks ($100 -ish) and waaaaay too much time on your hands it's pretty easy. Basically it's just s fuel measuring system, a fan to mix the fuel inside and an electronic spark. No guessing, just boom. You MUST visit the SpudFiles site and check out the forums! Message me if you have questions...
Realy nice set up! I have done somthing similar but pneumatic, And im running it off a scuba tank. quick question for you mate, what stops the fan from melting/getting destroyed from the quick combustion?
@RideSaintJohn Basically the pressure is from all directions rather than from one side or another. I used an aluminum framed fan to keep it from deforming from the heat. Got several hundred shots on this fan (and a spare still in the box).
Pressure Rated PVC is good up to 220 PSI in the 4" size (if I remember correctly) and the Mapp Gas can't generate much more than 100 PSI on a good day. Well within parameters. The fan is a 70mm Computer fan with an aluminum frame but since it's sealed inside the cannon it doesn't experience much pressure *differential* so it doesn't take much real stress. I've got at least 200 - 300 shots out of this cannon and never replaced a part...
@VerbotenDingleberry thats pretty impressive i figured it would take a lot more than 100 psi to do that but i guess at that big of a bore the power is greatly increased to 3 or 4 times that nice
@stingraystud As I recall we had a 10' barrel (2") on the gun that day. Just slightly short of "optimum" (there is actually an ideal ratio between chamber and barrel volume of about 0.7:1, the "C:B ratio"). My tennis ball barrel (2.5") is optimum at just over 8'; shorter but the same volume as the 2" barrel. The large volume of the cannon makes for long (optimum length) barrels so that big ass slug had a long time to accelerate. Plain old physics stuff...
Washer slug? You mean those little coin-looking things I used to fool arcade machines with back when I was a kid? How does this work, and what was that big thing that you said you had to rebuild?
It's just a slug (like a bullet) made of steel washers, two rubber washers, a piece of pipe and two endcaps. Look closely at the video. It tore the rubber washer off the front when it passed through the block so I had to rebuild the slug with new rubber washers.
@koqababy94 absolutely yes, that's probably a half pound slug flying at maybe 600+fps, that's a massive ammount of energy, enough to shatter the brest bone into a million pieces and pierce through and through the chest.
also it is pretty cool becasue i got the chance to build a t shirt cannon for my school and we use it at football and basket ball games its pretty powerful to becasue i almost took out my math teacher with it
well i have shot a dull arrow at 80 PSI and it actually went through a 2x4 which was sweet but i broke one of my sabots and need to make a new one and well at 250 yds i got five shots all within 5 yards of each other so its pretty consistant and im happy with it well accuracy at fairly short range (50 yds) is extreamly good hits the bulls eye on my bow target i might be able to make a video but first i need a new camera becasue our old one still uses tapes.
very very nice i have a sweet looking pneumatic that i have converted into a sniper like arrow rifle which will shoot an arrow about 225 -250 yards at about 80-90 PSI
thats a nice slug friend , i am at a 1/2" bore and i have to say thisr is proof i need a bigger barall,also i have an idea for you
if you rappe the pvc in a nice neat x patern
with string that doesnt stretch much and it will help make it safer,any way thanks for the slug idea i can make a good small one of those, have you seen the gie with the steal wool gas bomb slugs,its insane it fires and looks like alazer beem then boom big fire ball
Another nice cannon, I've never built a combustion cannon, prefer the Pneumatic ones for their power and simplicity. Pneumatics seem a bit more predictable than a controlled explosion inside PVC! Nice cannon though, I bet there was an awful amount of recoil with that heavy slug in there!!!
The one great thing about a combustion is that I can carry the whole rig out to a buddy's house or out into the woods and shoot all day without needing a compressor (or CO2 tank in my case). But for power, you're right, these pneumatics *rule*. Now that I have a 2" I can try some of the stuff I did with my 2" combustion for a comparison...
My first guns were aerosol guns but I just got tired of "Click, click, click, click, bang".
When you do manage to get the exact right mix on an aerosol gun they can be very powerful as well. That's the trick; getting the the fuel/air mix just right.
Nice power! How does your advanced cannon do for distance impact energy? How much destructive power does your gun have at say 100 or 150 yards using a smaller barrel against some 3/4 inch plywood or particle board? It has to be the best cannon I've seen.
It would be interesting to attach an engine compression testing gauge to your combustion chamber and see how much pressure is generated. Not sure if a compression gauge would go high enough to test the compression but it would be interesting.
Thanks. I haven't done a lot of distance shooting at targets. Might have to break out the 10' golf ball barrel...
From me reading on SpudFiles I'd guess it tops out at 60-75 psi. That's why a pneumatic with a decent valve (at 100-125 psi) can usually outperform a combustion.
What is that and how do i make it
lolyoumadcow 6 months ago
@lolyoumadcow
Lol. That's an "Advanced Combustion Potato Cannon". I have some vids that describe how it works that should help. If you have a decent plumbing warehouse near you, a few bucks ($100 -ish) and waaaaay too much time on your hands it's pretty easy. Basically it's just s fuel measuring system, a fan to mix the fuel inside and an electronic spark. No guessing, just boom. You MUST visit the SpudFiles site and check out the forums! Message me if you have questions...
VerbotenDingleberry 6 months ago
Realy nice set up! I have done somthing similar but pneumatic, And im running it off a scuba tank. quick question for you mate, what stops the fan from melting/getting destroyed from the quick combustion?
RideSaintJohn 7 months ago
@RideSaintJohn Basically the pressure is from all directions rather than from one side or another. I used an aluminum framed fan to keep it from deforming from the heat. Got several hundred shots on this fan (and a spare still in the box).
VerbotenDingleberry 7 months ago
How fast was that going ?
Carbonexpress97 8 months ago
@Carbonexpress97 I never chonographed it. Probably not too fast, it was 1.5 lbs. so it was pretty hard to accelerate (kicked like a mule).
VerbotenDingleberry 8 months ago
how did that pvc gun not explode under that pressure and is the little fan part of the combustion chamber? if so how the hell did it survive
stingraystud 1 year ago
@stingraystud
Pressure Rated PVC is good up to 220 PSI in the 4" size (if I remember correctly) and the Mapp Gas can't generate much more than 100 PSI on a good day. Well within parameters. The fan is a 70mm Computer fan with an aluminum frame but since it's sealed inside the cannon it doesn't experience much pressure *differential* so it doesn't take much real stress. I've got at least 200 - 300 shots out of this cannon and never replaced a part...
Check out the SpudFiles site for info.
VerbotenDingleberry 1 year ago
@VerbotenDingleberry thats pretty impressive i figured it would take a lot more than 100 psi to do that but i guess at that big of a bore the power is greatly increased to 3 or 4 times that nice
stingraystud 1 year ago
@stingraystud As I recall we had a 10' barrel (2") on the gun that day. Just slightly short of "optimum" (there is actually an ideal ratio between chamber and barrel volume of about 0.7:1, the "C:B ratio"). My tennis ball barrel (2.5") is optimum at just over 8'; shorter but the same volume as the 2" barrel. The large volume of the cannon makes for long (optimum length) barrels so that big ass slug had a long time to accelerate. Plain old physics stuff...
VerbotenDingleberry 1 year ago
what can this possibly be used for?
CRAPCANNONS 1 year ago
@CRAPCANNONS
If you have to ask...
VerbotenDingleberry 1 year ago
@VerbotenDingleberry
stray cats...?
Fuji blimps...?
census takers...?
CRAPCANNONS 1 year ago
@CRAPCANNONS
lol
No, Maybe and Positively, Yes...
VerbotenDingleberry 1 year ago
you should get a high speed camera. than shoot down a helicopter
mikelikefatcat 1 year ago 3
you need to get a high speed camera
mikelikefatcat 1 year ago
pause at 1:34.56 and you can see the projectile. It looks like a railroad spike by the time it goes right through the blocks it looks different
minibanger007 1 year ago
Washer slug? You mean those little coin-looking things I used to fool arcade machines with back when I was a kid? How does this work, and what was that big thing that you said you had to rebuild?
TheReapersSon 2 years ago
It's just a slug (like a bullet) made of steel washers, two rubber washers, a piece of pipe and two endcaps. Look closely at the video. It tore the rubber washer off the front when it passed through the block so I had to rebuild the slug with new rubber washers.
VerbotenDingleberry 2 years ago
wow can it kill???????
koqababy94 2 years ago
lol. In the wrong hands it might...
VerbotenDingleberry 2 years ago
@koqababy94 absolutely yes, that's probably a half pound slug flying at maybe 600+fps, that's a massive ammount of energy, enough to shatter the brest bone into a million pieces and pierce through and through the chest.
drewnickel 1 year ago
NRA Sticker FTW
BenSTA09 2 years ago 5
"I really doubt it will reach the third one."
idiotbehindthemask 2 years ago
NICE!
omg119 2 years ago
also it is pretty cool becasue i got the chance to build a t shirt cannon for my school and we use it at football and basket ball games its pretty powerful to becasue i almost took out my math teacher with it
mountaingoatboy1 2 years ago 2
well i have shot a dull arrow at 80 PSI and it actually went through a 2x4 which was sweet but i broke one of my sabots and need to make a new one and well at 250 yds i got five shots all within 5 yards of each other so its pretty consistant and im happy with it well accuracy at fairly short range (50 yds) is extreamly good hits the bulls eye on my bow target i might be able to make a video but first i need a new camera becasue our old one still uses tapes.
mountaingoatboy1 2 years ago
very very nice i have a sweet looking pneumatic that i have converted into a sniper like arrow rifle which will shoot an arrow about 225 -250 yards at about 80-90 PSI
mountaingoatboy1 2 years ago
So, what would an arrow do to, say, a watermelon or maybe plywood at 90 PSI?
What kind of accuracy can you get?
Wait, here we go; shoot an apple off the top of a watermelon (with a wig and sunglasses perhaps... on the watermelon I mean :)...
We Need Video!
VerbotenDingleberry 2 years ago
thats a nice slug friend , i am at a 1/2" bore and i have to say thisr is proof i need a bigger barall,also i have an idea for you
if you rappe the pvc in a nice neat x patern
with string that doesnt stretch much and it will help make it safer,any way thanks for the slug idea i can make a good small one of those, have you seen the gie with the steal wool gas bomb slugs,its insane it fires and looks like alazer beem then boom big fire ball
NOBOX7 2 years ago
That's MushiYoshi, he's a spudgun God....
VerbotenDingleberry 2 years ago
Another nice cannon, I've never built a combustion cannon, prefer the Pneumatic ones for their power and simplicity. Pneumatics seem a bit more predictable than a controlled explosion inside PVC! Nice cannon though, I bet there was an awful amount of recoil with that heavy slug in there!!!
Mtrhd0024 2 years ago
The one great thing about a combustion is that I can carry the whole rig out to a buddy's house or out into the woods and shoot all day without needing a compressor (or CO2 tank in my case). But for power, you're right, these pneumatics *rule*. Now that I have a 2" I can try some of the stuff I did with my 2" combustion for a comparison...
VerbotenDingleberry 2 years ago
greta work bro i love you testing
NOBOX7 2 years ago
hoollly shiittt! fucking sweet as shot man knocked over all 3 plus ur lil board haha classic
blackelfxxx 2 years ago
Thanks.
That's why I love this hobby...
VerbotenDingleberry 2 years ago
isnt that thing heavy but holy crap man that thing is sweet
MAPP gas huh?
i just use aquanet
it works pretty good
fordman500 3 years ago
My first guns were aerosol guns but I just got tired of "Click, click, click, click, bang".
When you do manage to get the exact right mix on an aerosol gun they can be very powerful as well. That's the trick; getting the the fuel/air mix just right.
VerbotenDingleberry 3 years ago
ya i use a coleman sparker for lamps
it works great
she usually gets shoots on the first round
fordman500 3 years ago
Nice power! How does your advanced cannon do for distance impact energy? How much destructive power does your gun have at say 100 or 150 yards using a smaller barrel against some 3/4 inch plywood or particle board? It has to be the best cannon I've seen.
It would be interesting to attach an engine compression testing gauge to your combustion chamber and see how much pressure is generated. Not sure if a compression gauge would go high enough to test the compression but it would be interesting.
kwalper57 3 years ago
Thanks. I haven't done a lot of distance shooting at targets. Might have to break out the 10' golf ball barrel...
From me reading on SpudFiles I'd guess it tops out at 60-75 psi. That's why a pneumatic with a decent valve (at 100-125 psi) can usually outperform a combustion.
VerbotenDingleberry 3 years ago
great work cant wait to see more.
010295 3 years ago
was that propane or mapp gas?
lctchamp 3 years ago
MAPP gas. It's got a tiny bit more bang and since I get hundreds of shots from a tank the price difference isn't an issue.
VerbotenDingleberry 3 years ago
Very nice. Good idea with the washer slug. I only had 2 sockets and lost both. I will be trying the washer idea soon.
BLinindoll 3 years ago