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A QEV gun

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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A QEV gun

Unread postAuthor: PotatoEnemy17 » Fri Aug 17, 2012 2:23 pm

I just finished my QEV gun this morning. This gun is intended to be an "Indoor Gun" so I can use it inside without destroying anything (of coarse if you use a ball bearing for ammo then this gun would easily shoot though a wall) I designed a special type of ammo, made of Saran wrap, that can safely be shot inside. Originally I used Nerf bullets, but they cot ripped into pieces after being shot. I shot the gun at my foot at 80 PSI using my Saran wrap ammo and it felt like a paintball gun. There are no damage pictures. Also any advice is welcome, or ideas for future guns.

Do you think I need a longer barrel?
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QEV gun 001.jpg
Side view
Last edited by PotatoEnemy17 on Fri Aug 17, 2012 2:35 pm, edited 1 time in total.

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Re: A QEV gun

Unread postAuthor: jsefcik » Fri Aug 17, 2012 2:31 pm

PotatoEnemy17 wrote:I just finished my QEV gun this morning. This gun is intended to be an "Indoor Gun" so I can use it inside without destroying anything (of coarse if you use a ball bearing for ammo then this gun would easily shoot though a wall) I designed a special type of ammo, made of Saran wrap, that can safely be shot inside. Originally I used Nerf bullets, but they cot ripped into pieces after being shot. I shot the gun at my foot at 80 PSI using my Saran wrap ammo and it felt like a paintball gun. There are no damage pictures. Also any advice is welcome, or ideas for future guns.

Do you think I need a longer barrel?



how long is the barrel you have now?

you didnt give too much info, that like saying how long is a piece of string?
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Re: A QEV gun

Unread postAuthor: PotatoEnemy17 » Fri Aug 17, 2012 2:37 pm

jsefcik wrote:
PotatoEnemy17 wrote:I just finished my QEV gun this morning. This gun is intended to be an "Indoor Gun" so I can use it inside without destroying anything (of coarse if you use a ball bearing for ammo then this gun would easily shoot though a wall) I designed a special type of ammo, made of Saran wrap, that can safely be shot inside. Originally I used Nerf bullets, but they cot ripped into pieces after being shot. I shot the gun at my foot at 80 PSI using my Saran wrap ammo and it felt like a paintball gun. There are no damage pictures. Also any advice is welcome, or ideas for future guns.

Do you think I need a longer barrel?



how long is the barrel you have now?

you didnt give too much info, that like saying how long is a piece of string?

I'm sorry, I was having trouble uploading the pictures I'll try to get the rest of them up :oops:
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Attachments
QEV gun 002.jpg
the other side
QEV gun 003.jpg
Saran wrap ammo

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Unread postAuthor: mattyzip77 » Fri Aug 17, 2012 3:16 pm

If its meant to be shot inside leave it as is. Also I wouldnt reccomend shooting anything at yourself or anyone else for that matter. You could make your barrel about 2 feet longer and the way your chamber is set up your losing perelformance.Put the 90 degree elbow as close to the valve as possible using little or no pipe.
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Unread postAuthor: PotatoEnemy17 » Fri Aug 17, 2012 3:22 pm

mattyzip77 wrote: Also I wojldnt reccomend shooti.g anything at yourself .


Yes, I know shooting it at myself wasn't what most people would do. But the gun wouldn't even puncture paper. Normally I would never test a pneumatic cannon that way.
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Unread postAuthor: jsefcik » Fri Aug 17, 2012 3:41 pm

PotatoEnemy17 wrote:
mattyzip77 wrote: Also I wojldnt reccomend shooti.g anything at yourself .


Yes, I know shooting it at myself wasn't what most people would do. But the gun wouldn't even puncture paper. Normally I would never test a pneumatic cannon that way.



watch where you shoot and what you shoot at. i know from expeirnce,i got hit in the head from a golfball, no pleasant
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Unread postAuthor: PotatoEnemy17 » Fri Aug 17, 2012 3:47 pm

watch where you shoot and what you shoot at. i know from expeirnce,i got hit in the head from a golfball, no pleasant

Ouch :shock: That must have hurt. Most of my cannons are designed so that you cannot fire the gun and look down the barrel at the same time.

Believe me, gun safety is strictly practiced around these things
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Unread postAuthor: AircannonSweden » Fri Aug 17, 2012 4:18 pm

Nice gun PotatoEnemy17 :D
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Unread postAuthor: jackssmirkingrevenge » Fri Aug 17, 2012 4:20 pm

Enormous pilot volume makes JSR sad :(

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Unread postAuthor: PotatoEnemy17 » Fri Aug 17, 2012 4:33 pm

AircannonSweden wrote:
Nice gun PotatoEnemy17


Thanks! :P

jackssmirkingrevenge wrote: Enormous pilot volume makes JSR sad


Why? It's not semi-auto and it takes three pumps on the bike pump to get to 80 PSI. But I agree that it is wasteful.
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Unread postAuthor: jackssmirkingrevenge » Fri Aug 17, 2012 5:24 pm

PotatoEnemy17 wrote:Why? It's not semi-auto and it takes three pumps on the bike pump to get to 80 PSI. But I agree that it is wasteful.


Big pilot volume = slower pressure drop when you pull the trigger = slower valve opening = less performance

From another thread:

schrader attached to the base of the blowgun. You would need to remove the schrader stem, and keep the blowgun trigger pressed while filling.


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Unread postAuthor: PotatoEnemy17 » Fri Aug 17, 2012 5:28 pm

Good point, I'll consider building a new manifold, but don't you think a slide valve would give me the best opportunity for low pilot volume? Or a 2/3 DCV because I planning on building one soon.
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Unread postAuthor: jsefcik » Fri Aug 17, 2012 9:04 pm

PotatoEnemy17 wrote:
watch where you shoot and what you shoot at. i know from expeirnce,i got hit in the head from a golfball, no pleasant

Ouch :shock: That must have hurt. Most of my cannons are designed so that you cannot fire the gun and look down the barrel at the same time.

Believe me, gun safety is strictly practiced around these things



yes, should have gotten 18 stiches, im glad it hit me where it did, not 1inch lower, i wouldnt have an eye

here is http://www.spudfiles.com/forums/my-spud ... 23119.html my story
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Unread postAuthor: mattyzip77 » Fri Aug 17, 2012 9:21 pm

18 stitches is exagerating a little dont you think?? :cussing: :cussing:
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Unread postAuthor: jsefcik » Fri Aug 17, 2012 9:24 pm

mattyzip77 wrote:18 stitches is exagerating a little dont you think?? :cussing: :cussing:



thats what the doctor told me when i went
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