paintballgun bolts

[FighterAce]

Heavy paper works great with high pressure and fast valves... all you need is a long nail with a small diameter head to keep all that weight up front. The trick is getting the right angle on that cone, it must not be too long to affect the balance but not too short to have too much drag. The smaller the angle the better ballistic coefficient you get.

I decided to throw sabot idea all together out the window because it would be too much work for my use... thats why I'm looking into rifling. For me, its better to make a good barrel and not worry about the projectiles then to buy a smooth barrel and take a lot of time into making every single projectile exactly the same as the original... or a sabot in this case.

@ Mouz
What kind of paper are you wrapping in tape? Specifically, how much grams per square meter?
Knowing you're not some kind of robot, I think you cant wrap them consistently enough to get any great groupings... Another thing to look at when using tape is price. The better or more expensive the tape you buy, the less of it you will have to put on each dart, the more stable it is because the tail is lighter.
For me, thats not efficient at all...

btw. are you saying you got beyond the sos by using just 350 psi?

[Pellethuntr]

iv'e shot paper and duct tape darts at 350 psi. if you don't put on enough duct tape you get a super sonic unstableized ricocheting nail 
 

LOL awesome Ace would like to see a vid of that

[FighterAce]

What I would like to see is a chrono reading of his dart at 350 psi 

But you dont really need tape for 350 psi... I've shot my paper darts at 400 psi out of a piston valve with a C:B of 1.6:1 and they didnt fell apart. But they did fell apart when I shot them out of my M4 at 400 psi. The reason was that the screw I use to manipulate the barrel for loading was getting in contact with the dart and ripping a piece off, that probably caused an overpressure on just one side of the dart and basically ripped it apart.
Thankfully, I've found a solution witch I will incorporate into my next sniper rifle.

[mouz]

yes. if you get a big enough chamber and a long enough barrel its easy. i don't have a chronograph. i know its breaking the sound barrier because its really obvious when the firing noise is so loud you cant hear stuff after you fire it. essentially  a loud gas escape plus an EXTRA LOUD whip crack.

[mouz]

and i'm using cheap duct tape. and @FAce: aren't you expending like all your energy on the perfect plaster bullet or something? i just cramp some random pointy object in the barrel and fire it. and grouping? well i don't really have any idea, but i could (before my sniper rifle died) get nice consistent 30 yard head shots.

[FighterAce]

Nobody said they were perfect, getting a good mold is just good preparation. I spend more energy making coffee then mixing plaster and pouring it into a mold (not counting the time while I wait for it to harden  )
Using a large C:B ratio is really not necessary, most of the time the only difference you notice is more pumping. Its more efficient to go smaller chambers and higher pressure.

I'm gonna be using a barrel slightly over 1 meter long and somewhere around 600 psi... By your logic, my bullets will soon be picked up on radar as incoming supersonic bombers 

We sort of went off topic here.... what does any of this has to do with paintballgun bolts??

But.. joke aside, everyone has their needs and techniques and I respect that. If somethings working for ya then press on, dont care what others say.

[josephlys]

Yeah, from reading post on making sabot darts it seems like a lot of work but I will still try them out. Ive made a thick paper cone dart from a sheet of A4 paper, I rolled it up and the cone is around 7-8 layers thick. Put a 3''nail (8grams) in it, and used super glue and epoxy to sit it in place. I think its pretty tough now, and I didnt use any tools just hands and scissors. The cone is just a little over 4'' long but really streamline, it feels solid like a bullet haha . All in all I think the dart is now 160grains, 10grams give or take. Hope it will work well in a paintballgun.

Just wondering how many ? psi of output does a paintballgun put out in a single shot. Paintballguns with blowback system. I know most paintballguns are different but an example or two will be nice thanks guys

[josephlys]

..... Cond' from above:
Quoting from a paintball gun site :
''Having tested this theory I have found that CO2 puts out an average of 850 pounds per square inch of pressure at a cozy room temperature of 70 degrees. This may sound pretty good however, at 60 degrees we find that CO2 creates a pressure of about 750 psi. For those that play in the Michigan climate, you  might like to know that on a 40 degree November day your CO2 is only putting out a mere 550 psi.''

Does that mean 500psi- 800psi per shot, 500psi-800psi pushing an ammo out tha barrel? Does all this pressure come direct from the Co2 tank, or is it stored in an air chamber first

[Pellethuntr]

A paintball guns tank looses pressure as the temp gets lower and gains pressure as the temp gets higher, for some scientific reason that's how co2 reacts to temp change... The pressure does not come "directly" from the tank so to speak, there is a valve that only allows a little burst of co2 into the barrel each shot... that valve is very small and will need to be heavily modified for good air flown as well as getting a heavier hammer spring and probably a heavier hammer

[Pellethuntr]

Nobody said they were perfect, getting a good mold is just good preparation. I spend more energy making coffee then mixing plaster and pouring it into a mold (not counting the time while I wait for it to harden  )
Using a large C:B ratio is really not necessary, most of the time the only difference you notice is more pumping. Its more efficient to go smaller chambers and higher pressure.

I'm gonna be using a barrel slightly over 1 meter long and somewhere around 600 psi... By your logic, my bullets will soon be picked up on radar as incoming supersonic bombers  

We sort of went off topic here.... what does any of this has to do with paintballgun bolts??

But.. joke aside, everyone has their needs and techniques and I respect that. If somethings working for ya then press on, dont care what others say.

I agree with you Ace it would blow my mind if he was breaking the sound barrier with 350psi... with my rifle I know for a fact im not breaking the sound barrier but it is still VERY loud and echos across my whole town when I shoot... any time you release a lot of pressured air in one fast motion it is gonna make a loud crack as it escapes the barrel and the bigger the barrel and volume of air released the bigger the crack

[Forum Admin]

A good portion of the CO2 in a tank is liquid, you can actually feel it slosh around if you move it from side to side. As the temperature lowers, so does the pressure required to maintain the liquid state, thus lowering the pressure of the gas. The opposite is true with rising temperatures. If I recall, this is called the vapor pressure (physics class was a long time ago). This is one of the reasons why paintball guns that use CO2 have field expedient spring adjusters. On a hot day, you'll probably have a "hot" gun that needs to be turned down. For a set temperature, lets say 70 degrees, the CO2 in your tank will maintain a constant pressure while there is liquid in the tank.
So to answer your question, if CO2 pressure at 70 degrees is 850 psi, your shots will be fired at a consistent 850 psi pressure. A bit of CO2 will boil, bringing the pressure back to 850 psi. This requires energy, which comes from its surroundings. If you rapid fire, the tank will chill, dropping the vapor pressure and your shots will become weaker. I recommend waiting at least 10-15 seconds between shots for max shot consistency. Once the tank is out of liquid CO2, the pressure will drop rapidly with each shot, signalling you need a refill.

[josephlys]

Thanks for all the help guys. So, as I am aware the majority of mechanical markers employ the relatively simple blowback system. So I guess its easier to find.
Manufacturers like Tippmann have the in-line blowback system ( like in the vid I posted), and Spyder..etc have the stacked tube blowback design. Btw is the paintball marker you recommended a (stack tube blowback marker)