16 replies to this topic

[elchupathingy]

The gun is made from 1/2 pvc pipe and is in a spiral shape. I use a manual ball-valve.

The gun's tank and barrel are at a 3.5-4 : 1 ratio and this gets the dart moving with alot of power.
The tank is filled up to 60psi and is breeched loaded.

Range ( tested so far )

60' ->hit a wood box and buckeled the dart on impact. - > flat shot.

100' feet easily but it hit a tree before it started to come down. -> about a 20degree angled shot.

[EDIT]
Wow sorry about the messy post did not realize I had typed that badly.
Didn't know about the signature image thing.

Edited by elchupathingy, 02 May 2007 - 07:18 PM.

[PennyWise]

What?

[rebsol]

I could not understand your post at all, I do not mean to backseat moderate, but you better clean up your spelling and grammar, along with legibility.

[Rambo]

Also - images are not allowed in signatures, remove it before you're removed.

[NerfMonkey]

He built a homemade with a tank size to barrel size ratio of about 4:1. He shot a box and it destroyed the dart, so he knows the ranges are more than 60'. He is using a bike pump to pump it to 60 psi.

I don't know what you mean by a "ring" of PVC, care to elaborate? And what kind of valve are you using?

[PennyWise]

Ok, I get it now. That sounds pretty powerful but I'm still not sure what you mean by a spiral shape, do you have any pics?

[elchupathingy]

ill try and get a picture soon but I need to find my camera.

NEW RANGE

~120 feet at 60psi


CLOSE RANGE TESTS:
shot at 3/16 inch steel and made a good dent for a Stefan.
3 layers of carboard
Almost through a soda can stopped cause the can fell of the deck it was on.

shoots a mini gatorade bottle about 40 feet at 60psi. Straight up it shoots the same bottle about 30 feet into the air. Now onto version 2.

Need a bigger tank and a better trigger a manual ball valve is annoying.

Edited by elchupathingy, 03 May 2007 - 04:14 PM.

[Prometheus]

ill try and get a picture soon but I need to find my camera.

NEW RANGE

~120 feet at 60psi


CLOSE RANGE TESTS:
shot at 3/16 inch steel and made a good dent for a Stefan.
3 layers of carboard
Almost through a soda can stopped cause the can fell of the deck it was on.

shoots a mini gatorade bottle about 40 feet at 60psi. Straight up it shoots the same bottle about 30 feet into the air. Now onto version 2.

Need a bigger tank and a better trigger a manual ball valve is annoying.

No way in hell that made a dent in 3/16" steel plate. That's like saying it will go through a car's body panels.

[NerfFreak]

Prometheus is right. 3/16 sheeting is not possible to dent with homemade stefans with 60 PSI. I just went through the math, and there's not enough speed or mass for it to actually leave a dent. A mark I can see, but not a dent.


Anyway, sounds like a solid homemade. Try it out in a war and see how well it does. Those are my recommendations for now.

Pics?

[theschief]

Screenshot or it didn't happen.

Quite honestly, there is undoubtedly a part of the equation missing. The gun you have seems to be pretty potent, but can't imagine some of the things you've been describing. I'm not even sure if a foam dart could actually do the damage you say it does no matter how much power is behind it.
What do you have on the front of the stefan?

Edited by theschief, 03 May 2007 - 06:59 PM.

[CD-R]

I agree with thescheif. I have an AT3K with an extended air tank that is wickedly powerful; it can dent the lid of a paint can at point blank, and shoot through both sides of a pizza box. By dent a paint can, I mean a slight distortion visible by holding it up to a light and watching for a different type of reflection. I have two questions: Are you sure that it was steel, and are you sure that it was 3/16 of an inch thick? But, if you are getting the ranges you're talking about, then good job. You should definitely put up some pictures, or a more detailed description of your design. It sounds similar to something I built a while back: a bike pump, a 2 by six inch pvc air tank, a ball valve, and a barrel about three feet long (I don't think further explanation is necessary). If I remember correctly, mine got similar ranges.
I am not trying to criticize you, or doubt your design. I would just like to know how you made something that powerful.

[elchupathingy]

I'm really not sure about the thickness of the steel can. I know 3/16 is kinda thick i know. ill try to get a real measurement but there are 4 distinct dents in the metal. Also its a really old paint thinner can so my friend and I are kinda scared to open it.

Need thicker darts 1/2 FBR is really small in 1/2 PVC god 1/8 inch gap between the sides and the dart.


Pictures soon just made a more powerful cannon so ill be using that for now.


2 tanks 1" PVC at 12inches long. Will be testing after i get a leak fixed.

[hard rockr]

The gun is made from 1/2 pvc pipe and is in a spiral shape. I use a manual ball-valve.

The gun's tank and barrel are at a 3.5-4 : 1 ratio and this gets the dart moving with alot of power.
The tank is filled up to 60psi and is breeched loaded.

Range ( tested so far )

60' ->hit a wood box and buckeled the dart on impact. - > flat shot.

100' feet easily but it hit a tree before it started to come down. -> about a 20degree angled shot.

[EDIT]
Wow sorry about the messy post did not realize I had typed that badly.
Didn't know about the signature image thing.

how do u pump it? did u make a pump or use an external one?

[CaptainSlug]

its a really old paint thinner can

Then it's probably only .005" thick, not .1875" thick which would be the starting thickness for the armor on a personnel carrier protected from small and medium arms fire. Containers get strength from their shape, not from the material thickness.

[Gyrvalcon]

I'm still not sure what you mean by a spiral shape.

I think he means that the pressure chamber has multiple angled couplers, allowing it to form a loop and save on overall length. I might be mistaken, it's hard to tell from such a vague opening post.

[General Cole]

If the dart failed and the weight was the only thing to make impact it could slightly plausible. My Crossbow can dent a cheap metal door at close ranges with a good dart. If the dart failed and the homemade had a huge airtank it might happen.

[skate 4 life]

sorry but your post really doesn't make much sense to me...try to be a little more specific on your descriptions next time.