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| Aaron ????? |
 Posted: 06/20/2005 1:32 AM Post subject: kick from a piston valve |
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Sergeant
Joined: 10 Mar 2005
Posts: 99
259.51 Spud Bux
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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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| pvt joker |
| Posted: 06/20/2005 3:46 AM Post subject: |
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Private First Class
Joined: 13 Jun 2005
Posts: 33
75.43 Spud Bux
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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
ryan |
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| aussiecyclist |
| Posted: 06/20/2005 4:20 AM Post subject: |
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Private
Joined: 17 Jun 2005
Posts: 11
31.17 Spud Bux
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how do u figure that u will have that much kick?
like u useing a formula or something? |
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| TurboSuper |
| Posted: 06/20/2005 4:21 AM Post subject: |
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Colonel
Joined: 16 Jun 2005
Posts: 646
972.40 Spud Bux
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Or you could build a stand out of wood for it. This should absorb the recoil and make it go even further.  |
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| Tommy_TreeTop |
| Posted: 06/20/2005 6:49 AM Post subject: |
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Corporal
Joined: 13 Jun 2005
Posts: 67
5.70 Spud Bux
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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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| spudshot |
| Posted: 06/20/2005 7:49 AM Post subject: |
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Brigadier General
Joined: 03 Oct 2004
Posts: 1044
41304.56 Spud Bux
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| 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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| pvt joker |
| Posted: 06/20/2005 16:19 PM Post subject: |
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Private First Class
Joined: 13 Jun 2005
Posts: 33
75.43 Spud Bux
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turbo super
how do stands make your projectile go further. i might make one. |
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| Cole |
| Posted: 06/20/2005 16:33 PM Post subject: |
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Sergeant First Class
Joined: 22 May 2005
Posts: 130
184.79 Spud Bux
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| I dont see how reducing recoil would make it go any further. |
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| spudshot |
| Posted: 06/20/2005 17:41 PM Post subject: |
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Brigadier General
Joined: 03 Oct 2004
Posts: 1044
41304.56 Spud Bux
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| it wouldnt, just the angle the stand is on would increase distance |
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| Aaron ????? |
| Posted: 06/25/2005 3:25 AM Post subject: |
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Sergeant
Joined: 10 Mar 2005
Posts: 99
259.51 Spud Bux
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| 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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| iamthewalrus |
| Posted: 06/25/2005 12:03 PM Post subject: |
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Colonel
Joined: 28 Feb 2005
Posts: 560
11.92 Spud Bux
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| 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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| spudshot |
| Posted: 06/25/2005 16:44 PM Post subject: |
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Brigadier General
Joined: 03 Oct 2004
Posts: 1044
41304.56 Spud Bux
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| 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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| boilingleadbath |
| Posted: 06/26/2005 20:26 PM Post subject: |
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Moderator
Joined: 12 Mar 2005
Posts: 1647
5491.22 Spud Bux
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The weight of the piston shouldn't matter; let's examine a dry fire:
.===[] .|
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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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| saladtossser |
| Posted: 06/27/2005 5:44 AM Post subject: |
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SpudZilla
Joined: 26 Mar 2005
Posts: 1237
98.19 Spud Bux
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That makes sense, but I think the air rushing out is going to have an effect of the gun.
| Quote: | 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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| Aaron ????? |
| Posted: 06/29/2005 2:24 AM Post subject: |
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Sergeant
Joined: 10 Mar 2005
Posts: 99
259.51 Spud Bux
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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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