Airsoft (1600 fps)

OK so for about 30 dollars and ~2 hours, you can have your own super accurate butane powered air soft gun, wrist mounted shooting at 1600fps. Its an attachment to the hidden blade and it can also be used by itself.

Youtube is having troubles with the audio =(

Step 1 Materials and tools!!!

All of the parts were avb. at my local hardware store
You'll need

1 Male NPT quick release 
1 Female npt valve
1 9/32 brass pipe (No Bigger or smaller!!!)
13/32 brass pipe (adapts and fit to most standard butane bottles, check to make sure ti fits first)
1 butane bottle
plastic bb's
metal putty!
5/16's cork
light load 1/4 od spring
1/4 npt to 1/4 inch hose barb
2 feet of 1/4 hose


Hot glue
Dremel!!!
Cresent wrench

Comments

[crmartin]

I really doubt people play air soft with you i mean really that could go straight through a mask or googles

[vulcan13]

you shot youre freinds with this gun there is no way it shoots at 1400 fps you could go hunting with that thing the 22. 250 can kill a goat at 200yards shoots that fast there is no way it goes that fast i have even shot the 22. 250
stop over exagerating

[itsthatsguy]

if you sto pto think, "could a peice of plastic weighing nothign close to a bullet do any realy damage?" youd realize speed and mass have nothing to do with each other.... light moves so freaking fast and yet we dont feel it. think before posting.

[iperrin]

Despite your consistent claim that a .2 gram, .23 gram, or .25 gram bb would do nothing to damage you, you are incorrect. The standard airsoft gun fires bb's somewhere between 250 and 450 FPS. Increasing this by some 5 fold does drastically increase the chances that you will break the skin, and embed a plastic pellet deep into someone's skin. The convenient thing about your design, as mentioned on another comment, is that the pellet is traveling no where near this speed. On Butane, which as also mentioned above is unsafe, you'll be pushing somewhere between 300 and 350. On HFC134a, also known as duster gas, or compressed air, you'll be pushing somewhere between 200 and 250. This is also assuming you have a perfectly pressure tight seal on the entire design, and I would doubt that with the components that the every day person has access to.

Your manner of measuring, the number of sheets the pellets travel through, is also not accurate. There are several threads posted on the forum Michigan Airsoft (MIA) that have reliable, tested methods of determining the general speed of a projectile. I suggest you take a Google search over there, and see what you can find. You might get a better, more accurate reading of your FPS.

[MultipleParadox]

Ok we'll do this nicely and quickly:

Most airsoft gas-guns works on propane/greengas right?
The high-range of these airsoft guns will reach about 550 fps, rarely 600 fps, at about 25ºC. And that is considered a lot, as 400 fps is enough to cause tissue damage. All this using 0.2g BBs.

Now, the propane is used in the same way as you use the butane; the gas expansion propels the BB.

Let's go check what's the Critical Pressure of both gas (that means the MAX pressure you could theoretically get no matter the temperature, not the pressure you actual have in your canister, which is much lower for security reasons)

Butane: 3.8 MPa
Propane: 4.257 MPa

Conclusion? You speak bullsh*t

I doubt butane would even give you more than 350.
Still not bad at all actually, but 1600fps? Come on. It's clear you don't even know what that means

[MultipleParadox]

Try this, it's been a proven empiric way of measuring fps, and is likely to be much much more accurate that your paper thing (that one made me laugh so hard, thanks for that)

http://www.instructables.com/id/Poor-mans-airsoft-chrono/

[iperrin]

You're completely right. 1600 FPS is a Class D firearm as well, and ranges inside the firing potential of a .22LR.

In addition, do NOT use butane in ANY form of cycling, projectile firing device. Butane is VERY unstable - this is why you can throw a lighter at the ground, and it will explode - so running around with a pressurized container of butane, which feeds into a chamber to fire pellets is unbelievably dangerous. Consider switching the gas to propane, a more stable gas used for other pressurized gas airsoft guns.

[ilpug]

okay, this is A) not shooting that fast on can pressure alone, and B) give me better directions, so i actually know what the heck to do.

[vulcan13]

1400 fps can half way through a deer
a can of butane or propane is not going to do something like that

[itsthatsguy]

if you sto pto think, "could a peice of plastic weighing nothign close to a bullet do any realy damage?" youd realize speed and mass have nothing to do with each other.... light moves so freaking fast and yet we dont feel it. think before posting.

[broper]

actual take this hole situation logicly i dout it is realy 1600 fps like nehi beacos you said light travels fast but its so small a bullet travels slower but its bigger it like the difrence if some one throu a cell at you and a rock at you but on the mater of y i dont think it 1600 fps is beacaus i have a stor bot bb gun that shot apr 1200 fps and it can shout thro 4 and a half cans lined up in a row what vulcan13 said might be true i have never actualy shot a deer beafor so i cant tell but a can of butane cant shot 1600 fps it might reach 900 fps tops but a good gun non the less

[mikemurph]

your math isn't even based on any velocity calculations...

[soccer-5]

You are absolutely correct. Look at his units and you will see that he is going on a tangent.

[itsthatsguy]

if you pased high school algebra you'd realize they teach Several vectorial (meaning mass-directions formulas on speed) equations, similar to the one i used.

[soccer-5]

Please state the exact equation you used and where you received your constants from. Stop being so vague please.

[soccer-5]

Why don't you chronograph this "1598 fps" gun to test your work.. You bring up basic high school equations, but I'm pretty sure they tell you to test your results? I am sure you will find your error

[nehi]

Umm I dont think that it could shoot at 1600 fps. An old pistol shoots at about 850 fps and that can kill you if it hits you in the right area. A paintball gun can shoot about a fifth of that and it can bruise you pretty badly. One person was shot by a paintball gun and it hit him on the side of the knee cap cracking it through the middle. I seriously doubt that it can shoot as fast as you say it can.

[sabladask]

I did exactly the same mat as you. The only difference was that mine went through 17 sheets of paper instead. With your calculations it would have gone 2200fps. As I do not believe at all!
by the way god build

[itsthatsguy]

Good to hear! i normally think of my projects as to hard to reproduce due to the level of custom machining. The difference in speed might be due to the quality of the LBT or how much of it is resting in the tube until firing or perhaps the difference in the weight of your bb's. Regardless i took it to a gun range and used a chronograph to measure its speed, i got 1400 fps, so decently close to m original estimate.

anywho glad to hear you remade it =)

Cheers

[Trace II]

Constant of paper/FPS conversion? What are you even talking about? Are you trolling?

[itsthatsguy]

Constant: meaning a value in a math equation, paper to fps: after doing nth involving the projectiles weight ands penetration the constant can be used to deteream a speed bassed off off weight ands penetration. Its algebra 1 Perelman math guys come on....

[Trace II]

That doesn't explain how you got that constant. It seems like you just made it up.

[itsthatsguy]

I didnt come up with the constant, i found it in an old algebra book for calculating things like this, it was originaly a problem for students to figure out but it fit well in this situation

[mikemurph]

there's literally not a chance in the world that your gun shoots at any supersonic speeds. Its a nice project despite the gross miscalculation of the FPS

[itsthatsguy]

90% of science is getting others to believe your findings, 5% are finding your findings, and 5 more % is backing your findings on the internet from people who don't legitimately know what they're talking about., think what you will, i triple checked my math and had a teacher check it for me since i myself thought this was improbable.

[sabladask]

(removed by author or community request)

[itsthatsguy]

noo not really ive used over and over and ovdr, ntm its super saf aside from gttign the butan on you when it fires, its built with a pressure blowout relief so it wont explode, ive covered all angls but ven still, i am safe and careful with it

[kve23]

itd be sweet if you added a crystal igniter and use combustion to ignite the butane as propellant

[itsthatsguy]

i thought about it but the liquid butane shoots out over 8 feet unlit, if i lit it the expansion would be ~3 times send a fire stream over 20 feet, not to safe xD

[spark2FLAME]

Wow! If this thing really shoots as fast as you said then (while it is an airsoft bb) shoots just as fast (or faster) than a Glock 18. While the G 18 has to shoot a round 60 times heavier than your bb (assuming its a .12 gram) that is still a scary idea! Nice job and be careful!

[osirisov]

Tell that to my hand, which has a .12 gram BB from a pellet gun at 480fps.

[itsthatsguy]

Hmmmm thats odd, it takes a steeper velocity curve than 57 foot-grams to goto break skin lol

[kve23]

he could have thin skin or softer skin

[itsthatsguy]

true that

[itsthatsguy]

Yea the math is a rough estimate its not a for sure thing it can b up to 150 fps off in either directions based on atmospheric differences or paper density, but its relatively accurate, and yes haha its quite fast but still safer than an actual gun as .12 grams wont really do anything at all aside from a welt maybe.

[ilpug]

so where does the combustion occur?

[itsthatsguy]

(removed by author or community request)

[ilpug]

yeah, im sorry, i misread something and thought it said combustion. badass gun though, if a bit dangerous... okay, ALOT dangerous :P

[itsthatsguy]

Ohh yea, but, its safe enough i mean if shot my freidns and there scared shitless as a large liquid butane cloud comes out it just looks super manly awsomeness hahaha

[TSC]

Sweet!