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Combustion cannon = explosive?

A place to ask general spud cannon related questions.
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Unread postAuthor: jackssmirkingrevenge » Wed Jul 11, 2007 12:35 pm

Can't you point out that that their car engine works on nothing but a series of "bombs" as they describe them, it's exactly the same concept - not only that but gasoline develops more power than propane.
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Unread postAuthor: SpudBlaster15 » Wed Jul 11, 2007 12:47 pm

Thanks Jack, I never thought of that, my document has been extended to 4 pages. :D
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Unread postAuthor: jimmy101 » Wed Jul 11, 2007 3:51 pm

You might try to point out to your P's that a combustion spud gun is virtually identical in operation to the gas engines in their car(s) and both involve explosions.

Or, that the design, building and testing of a spudgun is a great real-world application of mathematics, physics and chemistry.

Probably the best thing to do is to avoid future "... altercation(s) with an explosive device and the police". It doesn't really matter what you tell'm if they think you are doing stupid things on a routine basis.
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Unread postAuthor: jimmy101 » Wed Jul 11, 2007 4:01 pm

Ooops, didn't read Jacks' response before mine.

... not only that, but gasoline develops more power than propane.

Actually, gasoline and propane have virtually identical amounts of power and there are many vehicles that run on propane instead of gasoline. The difference in power between a gasoline engine and a combustion spud gun is mostly due to the gas engine being an ~8x hybrid.

A 4 cylinder engine could be described as a "quad, full-auto, 8x combustion launcher with a captured projectile". :D
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Unread postAuthor: mega_swordman » Wed Jul 11, 2007 4:12 pm

SpudBlaster15 wrote: my document has been extended to 4 pages.

Not to exploit your work, but could you post the document?

_Fnord wrote:Yes! Build a fusion reactor in your basement! It will scare the crap out of everyone and convince them to let you build cannons again (the best part is, a reactor isn't that dangerous at all, save for risks of radiation exposure, which can be easily avoided).


On the note of this story, there's a really good book about it called "The Radioctive Boy Scout" by Ken Silverstein
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Unread postAuthor: joannaardway » Wed Jul 11, 2007 4:36 pm

Just tell them that's fine, and now...

Because you have all that spare time and money, you're off to take some drugs, then go and hang out with a load of yobs in the town centre, get so drunk you forget where the house is - so torch a shop belonging to some social minority because you can't find home, then get bored, wreck a CCTV camera or two, steal several car stereos, flog them on eBay, and then because you have even more money from that, you'll be able to afford a petrol scooter to mow old ladies down with.

Or - you're going to make a huge Tesla coil instead, and use it to burn stuff - or maybe just play classical music

And then you offer them the chance to let you spud instead, but in a more controlled manner to before... might work.
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Unread postAuthor: f.c » Thu Jul 12, 2007 2:17 am

yes it is sadly an explosion i know its crap to think of it like that but it is.
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Unread postAuthor: Insomniac » Thu Jul 12, 2007 3:12 am

I dunno if it will help, but I wrote a 1 and a half page word document about reasons why combustion guns are no more dangerous than pnumatics. I'll post it if anyone wants to read it.
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Unread postAuthor: Modderxtrordanare » Thu Jul 12, 2007 3:28 am

Insomniac wrote:I dunno if it will help, but I wrote a 1 and a half page word document about reasons why combustion guns are no more dangerous than pnumatics. I'll post it if anyone wants to read it.


If ones parents are too stubborn to realize that don't/can't comprehend why a combustion cannon isn't that un-safe if built properly, why would showing them a document comparing it to another gun that is more powerful?

Wouldn't that just make them not allow him to make pneumatics either?
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Unread postAuthor: Insomniac » Thu Jul 12, 2007 3:40 am

I dunno, but spudblaster was writing a document for them anyway, so if I said anything useful in mine that he did't have in his it may have helped. And parents will most likely absorb it better if they read it on paper, if you try to talk to stubborn adults the just yell and you have no hope of getting through to them.
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I wonder how much deeper the ocean would be without sponges.
Right now I'm having amnesia and deja vu at the same time. I think I've forgotten this before.

Add me on msn!!! insomniac-55@hotmail.com
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Unread postAuthor: Insomniac » Thu Jul 12, 2007 4:33 am

Insomniac wrote:I dunno, but spudblaster was writing a document for them anyway, so if I said anything useful in mine that he didn't have in his it may have helped. And parents will most likely absorb it better if they read it on paper, if you try to talk to stubborn adults the just yell and you have no hope of getting through to them.


EDIT: Whoops, I have no idea how I made a double post, must have clicked the wrong button.
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Last edited by Insomniac on Thu Jul 12, 2007 6:07 am, edited 1 time in total.
I wonder how much deeper the ocean would be without sponges.
Right now I'm having amnesia and deja vu at the same time. I think I've forgotten this before.

Add me on msn!!! insomniac-55@hotmail.com
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Unread postAuthor: sniperjosh » Thu Jul 12, 2007 4:56 am

It appears your parents lack logical minds. Just explain to them about the gun in detail, about how you need to inject the correct propane volume etc, all that - Then say to them simply, I am intelligent enough to create this thing yet you seem to think you know more about its safety. How old are you? im 19.

My dad likes to talk to me about all the sciency side of the guns i make, and the designs i have etc, you can see how proud he is that i have an interest in all the finer theory and construction. My mother simply has not a single clue about any of the guns i have created, i try to explain to her but she couldnt care less / doesnt understand, she has an enormous trust in me though when it comes to my guns, she has never once questioned / doubted my ability to be safe.
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Unread postAuthor: psycix » Thu Jul 12, 2007 5:11 am

Tell them in that in the enginine of their car also ALOT of explosions happen.
And if they respond "Thats different because that are controlled explosions" tell them that a spudgun also makes use of controlled explosions.


One of the best things to rely on when convincing worried adults:
Tell them the pipe is PRESSURE RATED, and KEEP telling them that!

Maybe even do an calculation: My explosion is ## PSI and this pipe is pressure rated for ## PSI wich is ## PSI more!
Numbers and facts cant lie or be denied!
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Unread postAuthor: Insomniac » Thu Jul 12, 2007 6:05 am

What the hell? I quoted myself and I didn't mean to.

Hey I know what to do, get a balloon and put a little propane in it and a little air, then put some sort of plastic plug in the neck with a spark gap. So long as there is not too much gas in the balloon, when firing it will just rapidly inflate then shrink (this even works with small amounts of pure oxygen and hydrogen), and won't burst. Then show them the steel chamber of your hybrid and ask them if they think that the gasses that just inflated the balloon would be able to blow up the chamber. Its a bad comparison I know (the balloon expands and steel doesn't, and you will run the hybrid at higher mixes) but seeing an explosion take place in a balloon without it bursting may be enough to show them that explosions are controllable.
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I wonder how much deeper the ocean would be without sponges.
Right now I'm having amnesia and deja vu at the same time. I think I've forgotten this before.

Add me on msn!!! insomniac-55@hotmail.com
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