Re: Acetylene
Posted: Wed Jun 19, 2019 4:34 pm
They do look awesome, very scifi, sort of Flash Gordon.
Not really.Moonbogg wrote:I see the appeal of acetylene. It's easy to fuel the cannon with a basic atmospheric mixture while still getting good power from it.
I wouldn't feel safe using acetylene, nor would I feel it necessary for more performance myself, but my source of confusion is coming primarily from this article.D_Hall wrote:Not really.Moonbogg wrote:I see the appeal of acetylene. It's easy to fuel the cannon with a basic atmospheric mixture while still getting good power from it.
Once upon a time a certain someone (not me!) actually did a government study on the best gases to use for such applications. They studied (from memory) hydrogen, methane, ethane, propane, butane, and yes, acetylene. What they found was that the performance differences were small. After all, if you're mixing with air you've got a limited amount of oxygen so that's going to keep all hydrocarbons in the same performance ballpark (and hydrogen too, it turned out). After they spent a fair chunk of change they came to the same conclusion that I did before they even started....
"Its tough to beat propane for the combination of performance, cost, safety, and ease of use. If propane doesn't give you enough performance, using a bigger combustion chamber is a much better route than using weird fuels."
I just wanted to quote this so I could reply and say that you summarized all my feelings exactly haha. I live out in CO now - haven't made a spudgun in years but one of my dreams is to help the avalanche mitigation industry possibly with a more portable round launcher using hybrid construction vs. 600psi of nitrogen with heavy Size K or T gas cylinders. It will always be a dream of mine haha.Moonbogg wrote:I don't like this at all. These guys have beautiful cannons and they appear to know what they are doing. I thought we were special. I thought I was special. Seeing those guys with those beautiful cannons feels like I just saw someone with my wife or something. I need to start a therapy thread or something.farcticox1 wrote:so they are a thing
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These guys in the video are badasses. They tame dangerous fire and make it do stuff they want. They are true human. There is hope for me in this hobby in my older years (as long as I don't die young from taking an aluminum end cap to the face).
I see the appeal of acetylene. It's easy to fuel the cannon with a basic atmospheric mixture while still getting good power from it. However, I can't see myself moving away from hybrid cannons. Propane and air mixtures can practically deliver as much power as you can build for and manage to compress in the chamber. My heart is with the propane powered hybrid cannons. I can't wait to build another one.
Seriously, I bet a decent volume 4X piston cannon would out perform those acetylene cannons. You'd need to bring a big air tank with you though, but that would just replace their acetylene tank. The propane tank is so small it doesn't even count.
I went 10 years without building a spud gun and I honestly thought I was done with it. Then I got bit by the bug. It was incredible fun building a new cannon. I think you should make something.mobile chernobyl wrote:I just wanted to quote this so I could reply and say that you summarized all my feelings exactly haha. I live out in CO now - haven't made a spudgun in years but one of my dreams is to help the avalanche mitigation industry possibly with a more portable round launcher using hybrid construction vs. 600psi of nitrogen with heavy Size K or T gas cylinders. It will always be a dream of mine haha.Moonbogg wrote:I don't like this at all. These guys have beautiful cannons and they appear to know what they are doing. I thought we were special. I thought I was special. Seeing those guys with those beautiful cannons feels like I just saw someone with my wife or something. I need to start a therapy thread or something.farcticox1 wrote:so they are a thing
[youtube][/youtube]
These guys in the video are badasses. They tame dangerous fire and make it do stuff they want. They are true human. There is hope for me in this hobby in my older years (as long as I don't die young from taking an aluminum end cap to the face).
I see the appeal of acetylene. It's easy to fuel the cannon with a basic atmospheric mixture while still getting good power from it. However, I can't see myself moving away from hybrid cannons. Propane and air mixtures can practically deliver as much power as you can build for and manage to compress in the chamber. My heart is with the propane powered hybrid cannons. I can't wait to build another one.
Seriously, I bet a decent volume 4X piston cannon would out perform those acetylene cannons. You'd need to bring a big air tank with you though, but that would just replace their acetylene tank. The propane tank is so small it doesn't even count.
There is a certain primal joy in launching something at speed. I think it's intrinsic to our species, humans are uniquely adapted for throwing and finding mechanical means to enhance this has been a preoccupation of man for millennia. Indulging this predisposition is a source of happiness, along with a general focus on upper body strength as a man.Moonbogg wrote:I went 10 years without building a spud gun and I honestly thought I was done with it. Then I got bit by the bug. It was incredible fun building a new cannon. I think you should make something.
That sounds very true. There really is something about it that is just damn fun. Today I shot 36 mini soda cans. I found a better spot in the desert where I have room to aim high and just let it rip (something I've been dying to do) and holy crap do those cans fly like crazy. It was insane how far and high they went, lol. I have video but it's nothing special. Just me shooting up into the air. Also, when those golf balls happen to not spin and hook during flight but go straight instead, I swear it looks like they just go for ever. No sign of dropping when they actually go straight. Crazy fun. If you know of a way to control spin or eliminate it (thin sabot or cloth maybe?) let me know.jackssmirkingrevenge wrote:There is a certain primal joy in launching something at speed. I think it's intrinsic to our species, humans are uniquely adapted for throwing and finding mechanical means to enhance this has been a preoccupation of man for millennia. Indulging this predisposition is a source of happiness, along with a general focus on upper body strength as a man.Moonbogg wrote:I went 10 years without building a spud gun and I honestly thought I was done with it. Then I got bit by the bug. It was incredible fun building a new cannon. I think you should make something.
Take a #10 or thereabouts wood screw maybe 1.5 inches long or so - the kind you might use on a deck - and screw it into the ball so that it sticks out an inch. Put that in your barrel so that the screw is a tail of sorts. It will stop the ball from spinning in the barrel and once clear of the barrel, life is good.Moonbogg wrote:If you know of a way to control spin or eliminate it (thin sabot or cloth maybe?) let me know.
Sounds like a good idea. I might actually try that. I might drill a hole first and use a nylon or similar screw. I don't want the metal screw to ding up and scratch the aluminum barrel.D_Hall wrote:Take a #10 or thereabouts wood screw maybe 1.5 inches long or so - the kind you might use on a deck - and screw it into the ball so that it sticks out an inch. Put that in your barrel so that the screw is a tail of sorts. It will stop the ball from spinning in the barrel and once clear of the barrel, life is good.Moonbogg wrote:If you know of a way to control spin or eliminate it (thin sabot or cloth maybe?) let me know.