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kick from a piston valve

A place to ask general spud cannon related questions.
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kick from a piston valve

Unread postAuthor: Aaron ????? » Mon Jun 20, 2005 1:32 am

im making a piston valve and i worked out that at 100 psi there will be 950 pounds (431 kilograms) of pressure on my 2" pistonwhen the pilot is emptied does that mean there will be 950 lbs ok kick from this gun??? obuiously not so how much kick will there be ????

also i need some threaded bike valves for my gun because i cant fit the pull in valves in to the 1" pipe


PS. there better not be much kich on this gun because im only 13 and dont want to be injured by this gun kicking back at me
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Unread postAuthor: pvt joker » Mon Jun 20, 2005 3:46 am

the more kick the better haha nagh just hold so that your hands can swing back and take the kick (but make sure u hold it tighte or else ya arm will crack off) dont put it up against ya sholder or leg you will be right dont worry and get ya dad older brother or some one to shoot it first to tell u what its like

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Unread postAuthor: aussiecyclist » Mon Jun 20, 2005 4:20 am

how do u figure that u will have that much kick?

like u useing a formula or something?
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Unread postAuthor: TurboSuper » Mon Jun 20, 2005 4:21 am

Or you could build a stand out of wood for it. This should absorb the recoil and make it go even further. :shock:
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Unread postAuthor: Tommy_TreeTop » Mon Jun 20, 2005 6:49 am

Listen like Joker siad hold it out away from you and fire it. Just hold tight the first couple of times and then you shouldnt have any problems after that. Plus it cnat give that much kick. So you shouldnt have to worry. But if you are afraid like joker siad get sum1 else to shoot it.

My mini hand cannon gives sum kick, the first time i shot it it slammed straight into my stomach. It hurt but now its cool
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Unread postAuthor: spudshot » Mon Jun 20, 2005 7:49 am

i've never had much kick with my pistons, you should be fine, make sure you have a spring/rubber bumper inside to absorb the impact when the piston hits the back of your launcher, or it can crack the pvc and turn into a rocket
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Unread postAuthor: pvt joker » Mon Jun 20, 2005 4:19 pm

turbo super

how do stands make your projectile go further. i might make one.
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Unread postAuthor: Cole » Mon Jun 20, 2005 4:33 pm

I dont see how reducing recoil would make it go any further.
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Unread postAuthor: spudshot » Mon Jun 20, 2005 5:41 pm

it wouldnt, just the angle the stand is on would increase distance
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Unread postAuthor: Aaron ????? » Sat Jun 25, 2005 3:25 am

spudshot wrote:make sure you have a spring/rubber bumper inside to absorb the impact when the piston hits the back of your launcher,


im going to have 2 layers of rubber for this one on the back of the piston and the other on the reducer at the back each will be 6mm (1\4") thick so thats 12mm (1\2") of rubber all together

has anyone had the back part of their gun fly off from the force of the piston because ive made a sort of stock bit at the back and if that came off while i was holding it it could realy do some damadge
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Unread postAuthor: iamthewalrus » Sat Jun 25, 2005 12:03 pm

do pistons cause recoil or sum, cuz my paintball sniper hase a sprinkler valve and it has no notisable recoil, i could fire it holding with one hand pistol style, is the recoil caused because of the valve or what???
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Unread postAuthor: spudshot » Sat Jun 25, 2005 4:44 pm

yeah they do a little bit, especially if you have a heavy piston, with a light piston, like my milk cap piston i cant even feel it
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Unread postAuthor: boilingleadbath » Sun Jun 26, 2005 8:26 pm

The weight of the piston shouldn't matter; let's examine a dry fire:
.===[] .|
=== .[]|

Initaly, piston forwards, gun in inital position.
Piston is pushed back, same force pushes main gun forwards. Piston is stopped by bumper, movment stops. Result: valve opening pulls gun off shoulder.

(ammo recoil then preceades to accelerate gun into shoulder, resulting in collision instead of push)

Oh, and just a nitpick: Reducing recoil movment DOES increase velocity. Muzzle velocity will stay the same, but we don't measure speed from the gun's perspective. We measure it from the ground's perspective, and if your gun moves backwards compared to the ground... you will lose a few feet/second.
Like 2 or 3.
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Unread postAuthor: saladtossser » Mon Jun 27, 2005 5:44 am

That makes sense, but I think the air rushing out is going to have an effect of the gun.

Oh, and just a nitpick: Reducing recoil movment DOES increase velocity. Muzzle velocity will stay the same, but we don't measure speed from the gun's perspective. We measure it from the ground's perspective, and if your gun moves backwards compared to the ground... you will lose a few feet/second.
Like 2 or 3.


actual projectile speed = estimated projectile speed - recoil speed
is that what you are saying?
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Unread postAuthor: Aaron ????? » Wed Jun 29, 2005 2:24 am

i have a really heavy piston made from a 2" chunk of body filler 3 1\4" long it will have a 1 1\4" hole drilled in it 2 1\4" deep and some 1" pipe put in the hole to strengthen it and will have 2 55mm 'o' rings on it that sit in tiny grooves and has a 2mm hole to equalise the pressure


and also salad tosser if you were in a car going at lets say 100 fps and you shot a spud gun that shot at 100 fps the opposite way the car was moving when the gun kicks back it would be going at around 102 or 103 fps and im pretty sure the projectile would still be moving at around 100 fps so that cant be true there must be some limmits to how much the recoil of the gun can effect the projectiles speed.

i hope you under stand all that once again i say im no good at explaining things
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