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Why not to use acetylene as spud gun fuel.

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Unread postAuthor: Killjoy » Tue Mar 27, 2007 10:22 pm

Hmm i can't tell if you are threatening me or not.
As i recal, i did not say that i did not believe you claim, i was suggesting you post your cannon and specs here for the sake of proving your reported distance. I do not doubt your distance and beleive anything is possible, its just that many members on this site require definative proof before they would belive something that is seldom recorded(and a 1/2 mile recorded distance with a potato is rarely claimed).
I also asked your age mainly because you were very well spoken in one of your previous posts and pointed out many things which people tend to over look, and it made me assume that your were in your late twenties early thirties or an extremly well spoken teenager.
I also suggested you post the cannon on the forum, along with specs and a video, i did not say here on this thread (as you had already done that), but i meant in the cannon showcase so the information about your cannon would not be lost in the continuation of this thread, and a page would be set aside for your cannon.
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Unread postAuthor: Affliction » Tue Mar 27, 2007 10:45 pm

Nahh I'm a toothless tiger and I'm pure :twisted: . Just a little fed up with juvenile responses is all. I'll get some photos as soon as I can and maybe there will be some advise for me to make it even better!
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You are a pathetic imbecile if your spudgun goes "FWOOOMP" as you fire it.
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Unread postAuthor: Killjoy » Tue Mar 27, 2007 11:13 pm

Yes a toothless tiger doesn't sound very threatening (unless of course it still has its claws). Anyways lookin foreward to seeing your cannon.
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Unread postAuthor: MrCrowley » Wed Mar 28, 2007 3:40 am

I always love a Killjoy cause they break me out of my drunken stupor and focus my energy into killing this fucker! but ya I got specs and soon videos of massive destuctive power. I'm Early 30's with more knowledge than most of you 12 year old destructive punks. I'm interested in maximum performance out of a combustion gun. And acetylene just isn't the way. WTF! I did post specs! my bazooka is a 6'6" long by (4" by 2' chamber by 4' by 2" barrel) cut pipe lengths.... and All SCH40 ABS!


You guys sound like a bunch of amateurs; a half mile is not that far....EX.
a 22 calibur rifle is lethal to a mile but that does not mean that the projectile cannot continue it's flight for two or three miles! it just means it has lost the inertia to be lethal. 1812 style cannons fired over 5 miles and they were very inefficient at sealing a projectile to a barrel. so is a half mile a strech for a 1 pound potato..... I don't think so. Fired at 45 degrees it is possible with enough power.
You spudders overcomplicate everything; the fuel meters and the multispark ignition and the like and you use "shrapnel producing pvc", no wonder you have no clue. You buy a propane brazing torch and elimate it's most important design feature; it mixes air with your fuel to produce the optimum.. IE. BLUE FLAME! and instead try and reinvent the wheel!
Figure out how to use the built in design features of the products you destroy/modify to do the job for you. If fuel and air are mixed as the enter the chamber they also expel spent gasses, DUH! my motto is the KISS theory (keep it simple smart guy). Fans in the chamber are MOOT.
The american military discovered they have more explosive destruction if they detonate above ground before impact instead of at ground level; basic psysics, so placing your ignition a few inches before the encap gives maximum effect. There are many disciplines of science involved in making an effective spudgun and first is understanding how fuel burns in a chamber and how to maximise it's output. Next is volumectric effieciency, how the expansion rate of combusting gasses will effect the effieciency of the barrel volume. I see all your video's on YouTube and all I hear are "FWUUMP" instead of a proper "PAKK" sound.
Pathetic!
I came to this forum to possibly learn something new I havn't tried and all I get from you children is "nope it's not possible and you are full of S$#T!" Sorry I did try acetylene and I posted my best guess as to the distance.


Oh boy where do I start....

from the top...
1.Most of us are 15+...we have a few 20year old people and even 30+,40+and even 50year olds.
2.So Whats the difference between a 15year old 'destructive punk' who knows more about spudguns then a 30year old 'destructive punk'?
3.ABS isn't even recomended for pressure, before you start sch40 is a thickness rating not pressure rating...I wouldn't even use it on a propane combustion even if it is safe...it is in no way safe using it with acetylene...Who cares if it rips it is still very dangerous.
4. I assure you we are in no way amatures....I'll let some of the teenagers who own and run their own spudgun stores speak for themselves and they are in every way alot more talented and knowledgable then you.
5.Half a mile is far...if you havn't realised most spudders fail to achieve this even with the most advanced cannons.
6.How do we over complicate things? They may seem complicated to you, but then again you don't understand. The way we make things is to get the best performance or the best out of something for the most reasonable price...e.g using a sprinkler valve instead of a $600 butterfly valve.
7.Believe it or not...fuel meters are...wait for it.....used...to meter fuel :shock: hard to believe isnt it. And guess what multispark ignitions do?
8.If you don't realise PVC does infact schrapnel when taken above its limit.
9.And we have absolutly no clue what we are doing? We are just destructive punks who build cannons like this:
http://www.spudfiles.com/forums/viewtopic.php?t=5847&
10.Im pretty sure a brazing torch head isnt made for spudguns but then again what is? Apart from members of these forums who make their own. and improvise.
11.Keep It Simple Stupid
12.Fans in the chamber mix fuel to gain performance...isn't that why you are here to learn how to get the best performance out of a combustion?
13.Not all of us post videos on youtube...actually hardly any of use really,most of the ones you see are really 12year old destructive punks.
14.Pathetic.....THIS IS SPUDFILES! *Kicks you in chest*
/Spartan
15.You are telling me you have learned nothing from this forum....you should of learnt by now not to mess with the best...
16.How are people slightly younger then you/your age/older then you children?
17.We are ful of crap? You and your basic 'Bazooka' and half a mile is full of sh*t.

DR/BC Pneumatics feel free to step in at anytime
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Unread postAuthor: schmanman » Wed Mar 28, 2007 5:23 am

Affliction wrote:You guys sound like a bunch of amateurs; a half mile is not that far....EX.
a 22 calibur rifle is lethal to a mile but that does not mean that the projectile cannot continue it's flight for two or three miles! it just means it has lost the inertia to be lethal. 1812 style cannons fired over 5 miles and they were very inefficient at sealing a projectile to a barrel. so is a half mile a strech for a 1 pound potato..... I don't think so. Fired at 45 degrees it is possible with enough power.
You spudders overcomplicate everything; the fuel meters and the multispark ignition and the like and you use "shrapnel producing pvc", no wonder you have no clue. You buy a propane brazing torch and elimate it's most important design feature; it mixes air with your fuel to produce the optimum.. IE. BLUE FLAME! and instead try and reinvent the wheel!
Figure out how to use the built in design features of the products you destroy/modify to do the job for you. If fuel and air are mixed as the enter the chamber they also expel spent gasses, DUH! my motto is the KISS theory (keep it simple smart guy). Fans in the chamber are MOOT.
The american military discovered they have more explosive destruction if they detonate above ground before impact instead of at ground level; basic psysics, so placing your ignition a few inches before the encap gives maximum effect. There are many disciplines of science involved in making an effective spudgun and first is understanding how fuel burns in a chamber and how to maximise it's output. Next is volumectric effieciency, how the expansion rate of combusting gasses will effect the effieciency of the barrel volume. I see all your video's on YouTube and all I hear are "FWUUMP" instead of a proper "PAKK" sound.
Pathetic!
I came to this forum to possibly learn something new I havn't tried and all I get from you children is "nope it's not possible and you are full of S$#T!" Sorry I did try acetylene and I posted my best guess as to the distance.


there are very few cannons that shoot this far, the velocity is nothing like a rifle. comparing the two is like, eh, comparing a 7,000 horsepower nitro powered top fuel dragster engine to the 4-banger in your geo-metro, that's running on three cylinders.

there's no comparison.

the cannons that do shoot this far are usually hybrids, or very large.
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Unread postAuthor: joannaardway » Wed Mar 28, 2007 5:35 am

Ok, let's see. Half a mile - 2" diameter spud give or take:
*Goes to do some maths*

The spud takes up 3.1 *10^-10 Steradians of solid arc angle. Far too small to see clearly. And it's a dull grey against a not-dissimilarly coloured sky.

If you could see it clearly, then this is roughly equivalent to looking at an ant about hundred feet away, and being able to tell with 100% certainty which end is the head and which is it's butt.

Most people couldn't do that with more than the 50% random chance - at 10 feet.

So, now we've determined that you wouldn't be able to see it clearly at 1/2 a mile. So this either means that:
- You could see it, and thus the distance was much less than 1/2" a mile.
- Or you can't guess ranges.
- Or you just made up a large number nowhere near the truth.

Now, along with MrCrowley's excellent post above, I offer the following reason to doubt you:

Even people like Sgort, who is certainly in the top 5 for the most experienced spudders of all time has never ever claimed 1/2" a mile range with a combustion.

You obviously have no idea what any of our long developed technologies do:

- Chamber fans are proven to enhance performance by a huge factor - as in indeniable chronograph data. Better mixed fuel burns faster.
- Fuel meters use exactly the right amount of fuel to combust PERFECTLY with the quantity of air in the chamber - 4.2% (actually 4.19%, but no regulator can be that accurate) propane by volume.
- Multispark strips result in multiple ignition points. This means that the fuel burns faster, and peak pressure is reached even faster - meaning more power.

Some types of PVC do produce shrapnel (some types don't. It varies) - but 99 times out of 100, PVC is rated properly. ABS is very very rarely rated. There are more recorded failures from ABS cannons than rated PVC cannons, and there are more PVC cannons than ABS cannons. Go figure.

The damned military are trying to kill people by spreading shrapnel over a larger area.
Shrapnel from a ground explosion will be stopped by walls, vehicles and people quite fast. From the air, there are far fewer obstacles in the way.

That doesn't make the data relevant here.

Those aren't our videos on Youtube most of the time. Those pathetic "whuds" come from pathetic cannons.
I have cannons so loud that anyone within 20 feet of them should be wearing ear protection or risk permanent damage.

Before you accuse me of being another "Juvenile 12-year old boy":

You are currently listening to one 18 year old destructive British girl studing physics, chemistry and maths, who has created one of the most damned accurate range calculators out there. And I'll soon be off to University to study enginneering. I am not some damned n00blet.

So if you've read my post then you should have learnt something new - are you happy?
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Unread postAuthor: Affliction » Wed Mar 28, 2007 7:39 pm

Ya Ya whatever... I may have overestimated it's actual distance as I could not see where it actually landed with loss of velocity and all with air resistance. But I did use a pure oxyacetylene mix! and I did not die!
I was demonstrating how much power this fuel actually has. I fire 1/4 mile distances with my cannon all the time; I know this for a fact.
The blast with oxy/acetylene scared the hell out of me and I guessed it's ultimate distance by the effect of the recoil and it's distance above the trees. Maybe it petered out at 3/8 mile? who knows.
All I know is acetylene is not a fuel you should ever use in a spudgun PERIOD!
Anyways the QCTBDC was neat but being that I don't feel like hauling an air compressor to the woods with me it is way overcomplicated to be reasonable. Compact, simpe and to the point is what I'm looking for.
here's a forum post on my fuelling system.
http://www.spudfiles.com/forums/viewtopic.php?t=7011&
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You are a pathetic imbecile if your spudgun goes "FWOOOMP" as you fire it.
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Unread postAuthor: ShowNoMercy » Wed Mar 28, 2007 7:45 pm

So you basically post a huge arguement to something that has been estabilished and as soon as someone makes a fool of you, you give up? Why even bother posting if you knew that you would be made a fool of? And firthermore, which were you using acetylene or oxygen?
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Unread postAuthor: Affliction » Wed Mar 28, 2007 8:41 pm

ShowNoMercy wrote:So you basically post a huge arguement to something that has been estabilished and as soon as someone makes a fool of you, you give up? Why even bother posting if you knew that you would be made a fool of? And firthermore, which were you using acetylene or oxygen?

are you stupid? Oxygen on its own will not burn... WTF! I was using an exact mix from a welding torch to produce a true flame, neither carburizing or oxidizing. once I got the mixture exact I put the flame out by snuffing the tip against the floor and allowed the gas to continue.
The only fools here are the ones so entrenched in their beliefs that they will not accept the testimony of someone who's tried it. You all must be Liberals because only liberals are this stupid.
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You are a pathetic imbecile if your spudgun goes "FWOOOMP" as you fire it.
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Unread postAuthor: Killjoy » Wed Mar 28, 2007 11:55 pm

Ok you know what affliction, I tried to be nice, I was willing to accept the highly unlikely claim of 1/2 mile (which you have said might not be true), I offered you suggestions on trying to prove your claim, but now your just being a F*cking asshole and annoying as hell.

You criticize senior members who I garentee know more about cannons then you do and how to improve them. You reject common and proven ideas which so many people have tried and been pleased with the results and increase in performance.

I read your post about the fuel meter, and all you did was put members down who criticized you by saying you were some how superior because of your age and experiences.

You laughed at the fact you thought 16 year old teens think they know more then you, which, I'll be damned, is true in most cases because I'm 16 and I definantly know more then you about all these things you claim to have so much experience in (except the engine and vehicle thing), and I know their are members here who know more then me about almost everything, and therefore know more then you.

Now then, if you want to use your camping stove setup thats fine, I actualy thought it was a cool idea and had previosly been using that method with great success. If you want to use only your ideas and reject others, thats fine by all means be my guest. But don't you God Damn Dare come on this site and claim what you do is better then everyone elses, that you are superior, and criticize senior members who have more experience and know more about spudguns then you.

It is in your best interest to apologize to the people who you claim know nothing, never again act and assume your ideas are better then ours, and shut the hell about how superior you are, and from now on make only useful, complimentary comments, and keep an open mind, and then maybe you'll learn something from this site.
If not, then GET THE HELL OUT OF HERE.
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Last edited by Killjoy on Thu Mar 29, 2007 12:03 am, edited 1 time in total.

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Unread postAuthor: SpudBlaster15 » Thu Mar 29, 2007 12:01 am

I don't think he will be reading your post for a LONG time, if ever...
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Unread postAuthor: c19o » Thu Mar 29, 2007 12:01 am

Killjoy wrote:Ok you know what affliction, I tried to be nice, I was willing to accept the highly unlikely claim of 1/2 mile (which you have said might not be true), I offered you suggestions on trying to prove your claim, but now your just being a F*cking asshole and annoying as hell.

You criticize senior members who I garentee know more about cannons then you do and how to improve them. You reject common and proven ideas which so many people have tried and been pleased with the results and increase in performance.

I read your post about the fuel meter, and all you did was put members down who criticized you by saying you were some how superior because of your age and experiences.

You laughed at the fact you thought 16 year old teens think they know more then you, which, I'll be damned, is true in most cases because I'm 16 and I definantly know more then you about all these things you claim to have so much experience in (except the engine and vehicle thing), and I know their are members here who know more then me about almost everything, and therefore know more then you.

Now then, if you want to use your camping stove setup thats fine, I actualy thought it was a cool idea and had previosly been using that method with great success. If you want to use only your ideas and reject others, thats fine by all means be my guest. But don't you God Damn Dare come on this site and claim what you do is better then everyone elses, that you are superior, and criticize senior members who have more experience and know more about spudguns then you.

It is in your best interest to apologize to the people who you claim know nothing, never again act and assume your ideas are better then ours, and shut the hell about how superior you are, and from now on make only useful, complimentary comments, and keep an open mind, and then maybe you'll learn something from this site.
If not, then GET THE HELL OUT OF HERE.


Right on dude. But Affliction is banned, he said the F word.
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Unread postAuthor: Killjoy » Thu Mar 29, 2007 12:05 am

Crap I missed that news, oh well...at least i feel better now.
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Unread postAuthor: joannaardway » Thu Mar 29, 2007 3:46 am

<mrburnsvoice>Excellent</mrburnsvoice>
The guy wanted us to believe he had more degrees than a thermometer, and people like that really get on my nerves.

It seems now that I'm getting a reputation for being the pitbull of these forums, and for using <pun>"physical" takedowns</pun>. Whether that's a good thing remains to be seen - but so far, it doesn't seem too unpopular with the regulars.
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Unread postAuthor: CpTn_lAw » Thu Mar 29, 2007 4:42 am

lool Joannaardway !! The physics demonstration (even if it was shorty) was too damn cool! I'm curently studying physics at the university too, and i think the potato/ ant comparaison was pretty accurate :lol:
1/2 mile? that stands for what? 800 meters approx? That's a lot....even with an oxy/acetylen combustion.
well...this guy named Affliction is banned now, i suggest we stop talking about him, or everything he wanted will be his: that we talk about him.

So let's just stop this conversation (just a suggestion...)
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