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Sprinkler-valve Rifle

Now, with ergonomics!

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#1 KirbySaysHi

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Posted 05 December 2005 - 12:05 AM

Well, after reading this post I decided it was time to show my half-finished creation to the world.

I originally intended it to be a nerf rifle that would also have the power (if needed) to shoot "other" projectiles, and that would bear slight size reference to my Daisy 1848 Carbine BB gun. The end result is a gun that shoots nerf ridiculously well, but has slow ROF. Oh well. Did I mention it launches drumsticks?

Sorry the pictures don't show more, I had a family member take them (the gun is at my house, I am at my apartment 2 hours away) and I was lucky to get even these!

Anywho, the gun is basically a really small air cannon, using a blowgun as the trigger. The pump right now is just dangling off of where it connects to the tank, hence the term "unfinished". I just haven't found a good place for it yet.

The cannon takes about 10 pumps to get to 20psi or so, which is more than enough to nearly kill a mega stefan (or at least whatever the stefan hits). I haven't range tested it with exact measurments, but I can say this: it shoots from the edge of my backyard, across a neighbor's yard, and on average lands on the far edge of the NEXT neighbor's yard. All-in-all, about 100-120 ft, maybe more. I've found that the gun at 10 pumps is a little too powerful, and that sometimes the dart flounders in the air (which can also be attributed to poor quality stefans).

Anywho, the main point of making this gun was for accurate, and it serves that purpose. It's also easy to fire.

The pictures don't show it but I did have a breech consisting of a half-circle of PVC dremeled out of the barrel, covered with a sliding sealer thing. One of these days, I'll try one of those clip mods.

I'm also trying to get my brother to take a picture of it with him holding it, so you can see how well it fits in the hand. The blowgun looks awkward, but it's at the perfect place for your pointer finger to grab it.

And the pics: like I said, a family member took these... also, combine images 1-3 for an idea of the whole thing. It's rather compact, measuring about 2 1/2 feet or so...

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The butt/tank of the gun, notice the air input hose tapped into the PVC. Also, there is a pressure gauge that is tapped into the top of the tank that is non-visible from this picture. It is directly in-line with the barrel, and does not interfere at all with either holding or sighting.

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The trigger and valve, notice the red ball pump that is "hanging" near the top of the pic.

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The barrel, which is 1/2 SCH 40 PVC. This particular barrel is used to shoot drumsticks for a prototype drum accessory I'm developing. Notice also the large white tablet that has the label of "French Hovercraft Plans"... Someday I will build it, I swear!

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"Close-Up" of the trigger and valve. Notice the grey epoxy in the solinoid hole, and that I had to cut the blowgun down to allow it to fit. It originally had about and inch more on the output end. You can also see the ball pump more clearly here.

So, I believe this gun proves that you CAN use a sprinkler setup for a nerf gun. Also, the original intent was to make this thing prime with one or two pumps. I goofed by making the air chamber too large. I could fix this in a number of ways. If I would have made it smaller, it would prime in one or two pumps (while the output would have gone from high pressure high volume to high pressure low volume, which is what a nerf gun is). I suppose I could also find some super super high volume pump or something...

Anywho, enjoy, and if you have any questions, ask!

Copy!

Edited by KirbySaysHi, 05 December 2005 - 12:15 AM.

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#2 Langley

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Posted 05 December 2005 - 12:31 PM

Nice.
Any super high volume pump is either going to have a really long stroke making it take longer to pump per pump, or it will have a larger diameter (cross section) making the force required to pump it greater.
I tried using a big basketball pump on a nerf gun and it became too difficult to pump without worrying about breaking the gun before I could even get two pumps out of it.
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#3 KirbySaysHi

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Posted 05 December 2005 - 12:34 PM

Wow, I just got here...

Langley, if I were to place a larger pump on it, I don't think I'd need to worry about breaking the gun, since the thing is solid. I could see that being a problem for a real nerf gun, though.
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#4 Sharpshooter

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Posted 05 December 2005 - 03:52 PM

Ranges?

EDIT: Never mind im a douche bag and completely missed that part. Sorry.

Edited by Sharpshooter, 05 December 2005 - 03:54 PM.

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#5 DX-Robert

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Posted 05 December 2005 - 09:41 PM

Your air chamber is PVC. 3" can take over 200 psi, so why the concern about breaking the gun? Even with a bigger and more powerful pump, as long as there is a pressure gauge there shouldn't be any concern.
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#6 KirbySaysHi

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Posted 06 December 2005 - 05:27 PM

When I was talking about breaking the gun and such, I wasn't talking about breaking the gun due to air pressure, but more that the force of pumping the thing to high pressure might cause undue stress, leading to the gun breaking. I should have been more clear with my original comment!

With a nerf gun, the plastic is usually pretty weak, where as with PVC you don't really need to worry about that.
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#7 Crappy Nerfer

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Posted 06 December 2005 - 05:37 PM

Nice job, Kirby. Good ranges. What's the accuracy?
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#8 KirbySaysHi

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Posted 07 December 2005 - 12:29 PM

Honestly, I haven't tested it very thoroughly, but I can say this: as long as you pump it enough, and have a very high quality stefan... it'll pretty much go where ever you point it.

I know it's hard to tell from the photos, but when you hold it, it feels just like a rifle... which means you can look right down the barrel, without any elevation change or anything. So basically, the only limitations are the stefan and the pressure (since it does take around 5-10 pumps to prime). When I get home for Christmas, I'm thinking of revamping it and putting in a cpvc barrel to try and shoot micros... eventhough it probably benefits from the added weight of the megas. However, my micros tend to fit better in cpvc than my megas do in 1/2" pvc. So we'll see.

I don't think this thing needs a write-up, but if anybody wants one, I'd be more than happy to comply. Honestly though, it took me a few hours to put together, once I had everything figured out (as it usually is with air cannons as well!).
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#9 Team Slaya

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Posted 07 December 2005 - 04:18 PM

You should use zeros. They're 1/2" backer with foam craft sheet around the end. But since they're weighted, and have the foam on the end, they have more weight on the front for better range potential out of higher powered guns. Contact One Man Clan for info on that, I think I heard him say he was gonna post a writeup soon, anyways.

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Edited by Team_Slaya, 07 December 2005 - 04:19 PM.

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#10 KirbySaysHi

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Posted 07 December 2005 - 05:41 PM

Well, it looks like zero's site is down...

But I did find "Webby Darts" which look like they might have some potential for my gun. Obviously, I can't actually test this until winter break... since like I said, the gun is two hours away.

Thanks for the suggestion though!
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#11 davidbowie

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Posted 07 December 2005 - 06:09 PM

I love that gun!

If you want a higher-volume pump, you could use a foot pump (I got one for $8 at walgreens). You could mount it upside-down, and pump it like the pump on a pellet gun. They usually come with latches to stay compact when not in use. This might get a little clunky though.
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#12 KirbySaysHi

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Posted 08 December 2005 - 12:09 AM

Thanks, Dave, you're the reason why I posted it!

Right now, I'm thinking your thoughts exactly: clunky. Maybe I can find some sort of a mix between one of those full-size pumps you stand on, and a bike pump. You know, kind of meet halfway. Either that, or make it so I can more easily remove the air tank and replace it with a smaller one. That way, I can have a nerf gun, and a... whatever gun.

Otherwise, there's always trying to decrease the capacity of the tank, but I haven't been able to think of anything that would stay stationary in there... any ideas?

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