SpudFiles

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 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....

LOL. PWNED. Yeah try to contribute something good to the patato gun community.

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.

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.

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! =]

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

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.

Could I possibly be in Ka-hoots with one of those senior posters??? We'll never know.

You most definitively are, jk, I like combustions but pneumatics are easier for me.

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.

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

...or maybe this thread should disappear

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_pP₀T₀) / (V₀P_f) = T_p

Where V₀ is the initial volume, V_p is the volume at the optimum (perfect) ratio, P₀ is the initial particle count (in the case of propane-air, 26), P_f is the post-reaction particle count at (27), T₀ is the initial temperature in absolute units, and T_p 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_p
...and solve to find that T_p 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)

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

@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.