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What do you think is cooler, pneumatic, or combustion??

A place to ask general spud cannon related questions.
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What do you think is cooler, pneumatic, or combustion??

Unread postAuthor: kf4oij » Tue Mar 13, 2007 10:19 am

So, in an effort to get my post count high enough to enter the contest, and at the same time see what you guys think would be cool for a spud gun. I thought I would post this to see.
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Unread postAuthor: A-98 » Tue Mar 13, 2007 10:45 am

i think your only going to get flamed.....if your even allowed into the contest after this....i would suggest actually do something productive

and dont you dare go and start kicking topics....
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Unread postAuthor: crazyfreak0075 » Tue Mar 13, 2007 12:20 pm

LOL. PWNED. Yeah try to contribute something good to the patato gun community.
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Unread postAuthor: MrCrowley » Tue Mar 13, 2007 2:18 pm

What do you think is cooler, pneumatic, or combustion??


I think its cooler when the topic poster searches the damn forums and find 5 other threads like this and decides not to spam to get his post count higher for a compeition 2months away.
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Unread postAuthor: joannaardway » Tue Mar 13, 2007 3:53 pm

I would agree. It's worth researching before looking like a total idiot.

Now, I'll answer the question. I prefer pneumatics overall - but I think that combustions are "cooler", partly because of the muzzle flash and all that.
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Unread postAuthor: risto » Tue Mar 13, 2007 3:55 pm

i find it funny that he wanted to help HIS post count, when its mainly the senior members who are benefiting from a higher post! =]
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Unread postAuthor: Bluetooth » Tue Mar 13, 2007 3:57 pm

Yeah, I agree. Pneumatics kick ass because of the power of them and there are no misfires. Combustion just have the muzzle flash.
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Re: What do you think is cooler, pneumatic, or combustion??

Unread postAuthor: Pete Zaria » Tue Mar 13, 2007 4:44 pm

kf4oij wrote:So, in an effort to get my post count high enough to enter the contest, and at the same time see what you guys think would be cool for a spud gun. I thought I would post this to see.


I understand where you're at man, but the patrons of this forum aren't very tolerating of useless posts, as you can see.... Best way to up your post count without getting flamed is to post positive comments about people's guns - but find ones posted in the last week or two, otherwise it's kicking up an old topic (also gets you flamed).

I prefer combustions because they're portable. A properly built pneumatic can definitely have more power, though.

Bluetooth wrote:Yeah, I agree. Pneumatics kick ass because of the power of them and there are no misfires. Combustion just have the muzzle flash.


I'd just like to note, my metered propane over/under combustion has never once misfired. Why should it? Perfect 4% propane mix every time, chamber fan, spark strip. It's as reliable as a pneumatic, and much more portable. :p

Peace,
Pete Zaria.
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Unread postAuthor: kf4oij » Tue Mar 13, 2007 4:50 pm

Could I possibly be in Ka-hoots with one of those senior posters??? We'll never know.
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Unread postAuthor: frankrede » Tue Mar 13, 2007 5:37 pm

You most definitively are, jk, I like combustions but pneumatics are easier for me.
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Unread postAuthor: willarddaniels » Tue Mar 13, 2007 5:52 pm

Interesting reasoning for a new thread... I haven't been a member all that long and I reached 50 posts quite quickly. I guess that is because I have been actively participating in the forums. No, I am not a post whore, I do not create threads just to have people listen to me nor do I say "cool cannon, nice paint, you shouldn't use DWV" on all the showcase threads. I am, however, long-winded

I prefer combustions because of their portability and it has something to do with FIRE.
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Unread postAuthor: Hotwired » Tue Mar 13, 2007 6:01 pm

risto wrote:i find it funny that he wanted to help HIS post count, when its mainly the senior members who are benefiting from a higher post! =]


I totally agree.

This thread does nothing except boost existing members postcount.

I'll repost again in a minute after an acceptable pause of a couple of posts :D

...or maybe this thread should disappear
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Unread postAuthor: boilingleadbath » Tue Mar 13, 2007 7:12 pm

I felt like making a useless post:

Well, you lazy person, go use the GGDT. You'll find that the gasses, on exit, are significantly below the freezing point of water - to the tune of -50 to -100*F

We then note that any degree of research will show that combustions derive their pressure from temperature.
A bit more research will lead you to write this formula:
(V<sub>p</sub>P<sub>0</sub>T<sub>0</sub>) / (V<sub>0</sub>P<sub>f</sub>) = T<sub>p</sub>

Where V<sub>0</sub> is the initial volume, V<sub>p</sub> is the volume at the optimum (perfect) ratio, P<sub>0</sub> is the initial particle count (in the case of propane-air, 26), P<sub>f</sub> is the post-reaction particle count at (27), T<sub>0</sub> is the initial temperature in absolute units, and T<sub>p</sub> is the temperature at the optimum ratio.

This is based on the assumption that the pressure at the optimum ratio is equal to the starting pressure. This is not true for hybrids - but you should be able to figure out how to account for that factor.

We substitute the values like so:
(2.25L*26p*293K)/(1L*27p) = T<sub>p</sub>
...and solve to find that T<sub>p</sub> equals 635K.

Now, we note that this calculation ignores any evaporation of potato juices, but the optimum ratio for the latke tests using the sabot slugs suggest that this, at least up to the optimum ratio, is at most minor effect.
Also, you might note that this is the temperature when the pressure equals zero PSIG, and that the gasses might further cool off due to their momentum or such. I will not dispute that these effects might exist, but I doubt their seriousness.

So, I feel reasonably secure in saying that the exhaust gasses of a combustion spudgun are significantly hotter, on average, than the exhaust gasses of a pneumatic launcher, or, as you put it, that <b>pneumatics are cooler</b>.

(that was fun)
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Unread postAuthor: pyromaniac » Tue Mar 13, 2007 7:55 pm

dont spam for post count! read the treads and youll find out. Post your spud guns for higher post!

I like pnuematic teh most though
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Unread postAuthor: risto » Tue Mar 13, 2007 8:01 pm

@blb:

I am speechless at your genius. If I was a woman, I would throw my body at you to have your way with me.
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