HondaTuner

guys, you both should build potato guns then let me try them out since you're both within EASY driving distance of me

and Tim designed a machine to blow up PVC pipe, so he knows his ---- about that... I still want to see it go off someday, tim haha

stenseltizm

I'm not doin ---- that could in any way get me in trouble until my legal issues expire from the last time I was a dumbass, but I'll get you the PE and show you how to do it

I'll see if I still have the video of when we used compressed air instead of water, ---- broke the ss tank it was mounted in.

2%

Well, I think I can add my two cents on this topic.

Hmm, where to start..

Why is this? I mean, assuming that youve got an IQ higher than that of a rock, you should know that the more hair spray does NOT mean the bigger the boom.. (although hairspray is by far the WORST propellant to use in a combustion launcher..) There is a strict fuel to air ratio that needs to be taken into consideration or else the damn thing just wont fire! It is usually not the igniters' fault. If the fuel/air mixture is correct, than any spark should consistanly ignite the fuel.

Somewhere? I dont think so.. When drilling into the PVC, you should always drill into the part where it is double layered; where the fitting goes over the pipe. Reason being, because there is more strength at that spot than just the single pipe wall.

Silicone, huh? Have you ever heard of teflon tape? You wrap it around threads, and it seals them. That's what it was made for. There is no mess, or drying time either.

Where do you buy your butterfly valves at? I mean, don't quote me on this, but..Unless my eyes are decieving me, that looks like a ball valve in the picture you posted. But you know, I really shouldn't jump to conclusions like that..

No, you can't. You see, there's this thing called volume. And there is only so much of it in any sized chamber. So no matter how big your chamber is, and assuming your using a constant pressure, eventually you will run out of "space" --for lack of a better word.

How come? They aren't illegal..Were you shooting on someones private property? or at someone??

Just out of curiosity, where did you get "180-200psi." at? Did you have some sort of HPA set up? Because Ive never seen a standard air compressor that went that high...

Wow, I might have just peed a little...Would you like a cookie?

..Not really...You see, when you pressurize your chamber to "180-200psi", your are exerting a metric "---- ton" of stress onto it. Now, in a combustion launcher, the peak pressure spike is roughly 106psi. The average pressure generated inside a combustion chamber, is around 45-60psi. Much less than that of a pneumatic launcher.

In some circumstances, you are correct. But, what if you are in a large field? Unless you have some sort of HPA "station" you don't have dick on rye. With a combustion launcher, you don't need a compressor. Even still, with a pneumatic launcher you need to make sure you have NO leaks, a decently fast actuating valve (A ball valve is the WORST possible valve to use) and an air source. With a combustion based laucher, if you go so far as direct propane injection: http://burntlatke.com/lp.html all you do is set the pressure once, load the projectile, open one ball valve, shut it...open the next, shut it..and fire. Thats all there is to it. No filling up the chamber with air or anything like that.

Slow down there, cheif...First of all, this depends on many different things. For instance, the type of valve used: I would take a propane injected combustion over a pneumatic with a BALL VALVE any day..Serioulsy think about this, by the time that valve is fully open, that projectile is LONG GONE...Heck, its gone as soon as you crack it open. Better choices would include diaphragm valves, piston valves, chamber sealing valves, barrel sealing valves, or coaxials..Look around on the spudtech forums to learn about those. I could go on about the advantages and disadvantages of different types and sizes of valves.

Another thing to think about is ratios; a chamber:barrel or "C:B" ratios are one of the most important things to consider when dealing with the performance of your launcher. once you fire, the energy created (from a pneumatic or combustion) will start to push the projectile down the barrel. Eventually, the initial "blast" will run out of energy, and stop "pushing" the projectile. SO, if you have a very small chamber and a very long barrel, when you fire, the energy will run out before the projectile is out of the barrel. So basically, the projectile will have nothing "pushing" it, and it will be creating drag, thus giving poor distance. This can also be the other way around: If your chamber is huge and the barrel is tiny, then there will still be a ---- ton of wasted energy because the chamber is still producing energy, but the projectile is long gone.

The point Im trying to make is...If your launcher had a poor ratio, it would be MUCH less "efficient" than one with a good ratio..which just so happens to be around the .7:1 range..In case you were wondering. Don't believe me? http://burntlatke.com/15cb.html

Oh yea? well, how about my latest gun? http://img.photobucket.com/albums/v4...n/000_0085.jpg that's just the chamber... It will send a golfball past the speed of sound. My highest recorded shot is 1242 FPS (Feet Per Second) Which was measured using a chronograph. Ive shot golfballs clean through cars, among many other things. You should see what it does to a TV..Its not your average "spudgun"

Oh yea? well, uh..Hate to break it to you, but shooting a potato gun at any living thing is pretty illegal..Is this why the cops confiscated yours?

I beg to differ...You see, with the "weird curvy design" better known as an "over/under" configuration, you get what's called a venturi effect. This can improve performance, and it does, in fact..save some space.

Im sorry, but your a dumbass..First of all, if you can find a " 2.5" to 3.5" " reducer, I will come to your house, drop my pants, cut off my left nut with a dull pocket knife which I will steal from a cub scout..Put it in a jar, and swallow it...seven times. There is no such thing as "3.5" inch PVC pipe..and 2.5" PVC pipe is very hard to come by. let alone the fittings..Can I be so bold to say that your ----, is in fact..."straight gay"?

PVC pipe and fittings are divided into "schedules" The most common being "schedule 40" which is what we use for potato guns most of the time. Sometimes you will see one built from schedule 80, because the walls are thicker, and they are rated for higher pressures.

25-30 guns? If you have built that many guns, then why are you still using ball valves? I mean, you should at least upgrade to a solenoid actuated sprinkler valve..and you could mod that for pneumatic actuation for much better performance..without the hassle of batteries and switches.. http://www.spudfiles.com/forums/viewtopic.php?t=305&

Well, at least you're right on one thing...Im 16 years old. Good guess

Wrong again! If you would take the time to read, you would know that it says nothing about the lack of pressure testing...It does, however...right on the home page..and on every other page, say --Learn to read, "asshat" ...I rest my case.

Where are you getting all this pressure?

Nobody ever said that..

I would gladly invite you to do so...My name is "Jspellman" if you wish to talk to me on that forum.

This is where I draw the line....Bull ----! With that piece of ---- ball valved pneumatic, with a tiny *** chamber made out of what looks to be some sort of P-trap...and a random *** cleanout adapter thrown on there...That is IMPOSSIBLE! I mark my words. I dont care what pressure you were using, what projectile, what propellant, be it co2, helium, compressed air, nitrogen, whatever...A snowball has a better chance in hell than you shooting something "a little over 1/2 a mile" with that thing...I have made a pneumatic launcher with dual 4"x24" chambers, a 2.5"x8' barrel for tennis ***** (I said it was hard to come by, but not impossible to get..) fired by a 2.5" asco solenoid valve, modded for pneumatic actuation.. here it is without the barrel: http://img.photobucket.com/albums/v4..._0175_0001.jpg If you take off the barrel, fill up the tanks to 100 psi, and set it in the front seat of a car, remote fire it.. it will blow out the windows..Let's see your launcher do THAT! -Anyways, that monster will not launch anything 1/2 mile..This makes it hard for me to believe that yours achieved that kind of range.

...Any questions? Ill be glad to answer them for you.

Who Dey

...Any questions? Ill be glad to answer them for you.
yeah...I got a ?
How ------- long did it take to type all that?

2%

Haha, good question...Id say about a half hour?

SkunT

im glad you wasted 1/2 hour of your peice of ---- life.

i speak from experience. my experiences worked well and far beyond my expections. it also made me lots of money.

rprznt

holy crap
this topic is more bitchin' than turbo #### that concerning ricers :1

HMT-Admin

haha, you just got ------- worked in this thread by a 16 year old

xternal

0wned

Smith-02

+1