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A place to ask general spud cannon related questions.
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Unread postAuthor: jrrdw » Thu Nov 01, 2007 5:32 am

I'm into hitting what i aim at! more, WAY more accurate rounds! Before you/anybody says it, i know super balls aren't accurate, they are round.

But to make something cheep, easy to get, and consistent. I would even like to see whatever be envirmently(sp) friendly, if at all possible.

Side note: Why is it the words i have trouble spelling, the 'spellcheck' has no 'sagestions' for???
It had "no Suggestions" for "sagestions" even though rite below the text box it says "no Suggestions" crazy spellcheck!
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Unread postAuthor: mark.f » Thu Nov 01, 2007 5:36 am

I would like to see a combustion firing at atmospheric pressure and still using around 8.4% the chamber volume of fuel, and have it burn completely, without using oxygen enrichment, using propane as a fuel.

I would also like to see a truck-mounted pumpkin chunkin' cannon with "SpudFiles" painted on the side of it at the next competition they have.
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Last edited by mark.f on Fri Nov 02, 2007 5:57 am, edited 1 time in total.
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Unread postAuthor: BC Pneumatics » Thu Nov 01, 2007 9:16 am

markfh11q wrote:I would like to see a combustion firing at atmospheric pressure and still using around 8.4% the chamber volume of fuel, and have it burn completely, without using oxygen enrichment.


While easy to achieve, I do not see the point in this. Mixing two different gases into a formula to satisfy these criteria hardly seems reasonable.
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Unread postAuthor: octane89 » Thu Nov 01, 2007 9:40 am

My overall goal is to acheive a pneumatic cannon to shoot extremely far. Since Im having troubles while trying to open GGDT now, progress is slowed down.
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Unread postAuthor: jackssmirkingrevenge » Thu Nov 01, 2007 9:43 am

octane89 wrote:My overall goal is to acheive a pneumatic cannon to shoot extremely far. Since Im having troubles while trying to open GGDT now, progress is slowed down.


longest barrel, biggest chamber with the highest pressure and the best valve you can afford/make - and don't forget a projectile with an extremely low frontal area and high sectional density ;)
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Unread postAuthor: octane89 » Thu Nov 01, 2007 9:55 am

Well so far it looks like a mega launcher from spudtech. I have one of two 3" valves finished and I need to find a store that carries more pressure rated PVC from 3" and up.
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Unread postAuthor: williamfeldmann » Thu Nov 01, 2007 9:58 am

I am always trying to extend my range and accuracy. As part of that, raw power comes into play. But for me, controlled raw power is essential to good repeat launches.

I am old enough and have enough space out here is BFE (Iowa) to own and enjoy real firearms. However, there is a big difference in being able to hit a target at 400 meters with a bullet, and being able to hit a 2 foot by 2 foot chunk of plywood repeatedly with a golf ball cannon.

I am interested in faster loading methods and faster followup shots, but I think it is more of a gas problem than a projectile problem. One of the neatest ideas I have seen in a while was the self contained cartridges. Those are pretty neat.
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Unread postAuthor: spanerman » Thu Nov 01, 2007 12:19 pm

small, east to use, accurate, and possible of some good destruction....thats about all im aiming for these days
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Unread postAuthor: DYI » Thu Nov 01, 2007 4:55 pm

At the rate spudfiles is growing and getting more intelligent, I think that what will be here in only one year would be absolutely amazing now.

I expect to see several more working semi-auto concepts, a lot of beautiful manufacturing from Nova and JSR, possibly a high ROF combustion, a 20x hybrid or two, and, last but not least, a 3500 psi, custom valved, handheld 1.500 cal. air gun capable of velocities in excess of Mach 3. (guess who will be building that :twisted: :twisted: :twisted: )

We already have the ideas, we already have the supplies, and we already have the equipment to put it all together. We don't need to get rich if we can work together as a network, and support each other's causes. We can make this next year the most productive that the spudding community has ever seen.
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Unread postAuthor: Ragnarok » Thu Nov 01, 2007 6:26 pm

DYI wrote:A 3500 psi, custom valved, handheld 1.500 cal. air gun capable of velocities in excess of Mach 3.

And on an unrelated matter, I expect to hear on the news that someone was crushed by sheer recoil forces.

My main personal aim is to have built an automatic combustion BBMG.
I'd also like to have perhaps put something the other side of the sound barrier.

I can only assume that new ideas will crop up, and inspire yet more ideas. A year ago, I probably wouldn't have expected to have seen quite a lot of what is in existence today.
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Unread postAuthor: ammosmoke » Thu Nov 01, 2007 6:37 pm

Hey, I actually came up with an idea for that a while ago.... Except with marbles. But, it seemed quite impractical after looking it over.

But, if you want the link here ya go...

http://www.spudfiles.com/forums/strange ... t3871.html
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Unread postAuthor: DYI » Thu Nov 01, 2007 6:54 pm

And on an unrelated matter, I expect to hear on the news that someone was crushed by sheer recoil forces.
:lol:

Some interesting ideas on pneumatic recoil absorption have come to mind. Seriously though, some closer research on available materials and their cost will likely limit the calibre to 25.4mm, hence restricting the muzzle velocity of a 16 gram aluminum slug to slightly under Mach 3. Still, fairly impressive, and considering that some large bore hunting rifles can equal that muzzle energy with heavier slugs, I don' think that the recoil would be unmanageable.

The fact that that no commercial air gun can rival a .22 rimfire in velocity or muzzle energy, and that this will beat a .30-06 in both of those fields, makes it worth it to me. Also, reload times would be very low, under 2 minutes for a firing cycle.
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Unread postAuthor: jackssmirkingrevenge » Fri Nov 02, 2007 12:03 am

The fact that that no commercial air gun can rival a .22 rimfire in velocity or muzzle energy


Not quite - The Shinsung Dragon Slayer will do 80 ft/lbs or so more than the 0.22LR, while the air rifles made by Quackenbush and Barnes will exceed 500 ft/lbs in some cases.

Let's not forget this 20mm air rifle that fires a 1005 grain slug at 715 feet per second for a whopping 1140 ft/lbs - 10 times that of the humble 22LR, quite a few ft/lbs more than a 44 magnum and enough to take down a buffalo :shock:
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Unread postAuthor: mark.f » Fri Nov 02, 2007 5:43 am

BC Pneumatics wrote:
markfh11q wrote:I would like to see a combustion firing at atmospheric pressure and still using around 8.4% the chamber volume of fuel, and have it burn completely, without using oxygen enrichment.

While easy to achieve, I do not see the point in this. Mixing two different gases into a formula to satisfy these criteria hardly seems reasonable.


Sorry, I meant to say using propane as a fuel. This would be accomplished by somehow bringing the density of the air in the chamber up, probably by chilling.

Edited.
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Unread postAuthor: Ragnarok » Fri Nov 02, 2007 7:18 am

@Markfh11q: That density change would require chilling to -127<sup>o</sup>C (-169 <sup>o</sup>F), which is also well below the melting point of propane.
To get that cold, I hope you've got lots of liquid nitrogen handy, and then some way of breaking the 2nd law of thermodynamics to keep the propane warm while the air stays cold.

At those temperatures, PVC is clearly unusable, steel will become brittle, and the problem with other metals is that their thermal conductivities are too high.
If a combustion of such a nature could be made, then it should be impressive in terms of power though.

@Jackssmirkingrevenge: You're just full of firearms info, aren't you? Were you a gunsmith in a previous life or something?
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