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(Some Guy)   Use physics to modify your Nerf guns to hurt (with mathematical equations)   (nerfonline.com) divider line
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7039 clicks; posted to Main » on 25 Dec 2001 at 10:26 AM (18 years ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook



52 Comments     (+0 »)
 


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2001-12-25 10:30:59 AM  
I always thought adding pieces of glass, nails to the nerf ammo would suffice..
 
2001-12-25 10:41:45 AM  
the Nerfing community

that says it all.
 
2001-12-25 10:42:20 AM  
Of course, I'm posting on Fark on Christmas day. That says a whole lot, too.
 
2001-12-25 10:47:21 AM  
lurk,

me too! me too! solitude loves company... er... but then it wouldn't be solitude, eh?
if everyone fought with nerf guns, what would afghanistan be like?

doog
 
2001-12-25 11:39:53 AM  
I'm no rocket scientist but by streching the spring doesn't alter the spring constant in effect reducing or negating the effect of stretching it.

Also by adding the rubber bands so that they pull were the spring pushes. I believe that there are anumber of issues with this based upon the time constant of the spring and ruber bands. If they are not matched the spring will be reducing the effect of the rubber bands or the rubber bands will be reducing the effect the of the spring.

I personally this this guy is farked up and should leave free body diagrams to the experts, like his high school physics teacher.
 
2001-12-25 12:00:40 PM  
It might not vary the spring constant, but it will extend the default length, so that when it is placed back into the gun, it is precompressed. This increases the work done by the spring on the dart.
 
2001-12-25 12:08:09 PM  
x_i = initial compression (what he increases)
x = how far spring is compressed when loading weapon
k = spring constant
ke = kinetic energy given to projectile

ke = .5*k*((x + x_i)^2 - x_i^2)
= .5*k*( x^2 + 2*x*x_i + x_i^2 - x_i^2 )
= .5*k*( x^2 + 2*x*x_i )

So increasing the initial compression of the spring increases the kinetic energy of the projectile.
 
2001-12-25 12:26:55 PM  
I believe that there are anumber of issues with this based upon the time constant of the spring and ruber bands. If they are not matched the spring will be reducing the effect of the rubber bands or the rubber bands will be reducing the effect the of the spring.

Unhh... you're confusing electronics with mechanics... time constant? Huh? I've never heard that appied to springs. If you're thinking of harmonic motion, the angular frequency is proportional to the square root of the spring constant. Since the period is inversely proportional to angular frequency, the speed of the plunger is increased by adding rubber bands, since the firing action is a half-period.
 
2001-12-25 12:30:25 PM  
after reading the previous posts... i've developed a noseblood and a throbbing headache... =)

doog
 
2001-12-25 12:44:55 PM  
ok, why dont these motherfarkers just buy a paintball gun instead? fark this nerf shiat.
 
2001-12-25 1:03:08 PM  
Whatever happened to the classics like the water propelled rocket or Jarts.
 
2001-12-25 1:13:51 PM  
Ooohh.yeah,paintball..The trick is to put the paintballs in the freezer then go play..Goggle-shattering excitement!..
 
2001-12-25 1:14:02 PM  
Just so you know,
when you permanently stretch(plasticly deform) a spring you over stressed. It's now a bit stiff even though it will still act like a spring. To do it right you have to stress releive it. 20 minutes in a 550 degree oven should do it. That will put some "spring" back in your spring.
 
2001-12-25 1:20:35 PM  
It's all fun and games until someone gets sn eye put out.
 
2001-12-25 1:32:47 PM  
And DICK F...It's all shiats and giggles until you get hit in the buttocks with a frozen paintball..Sorry,Jan and I started Happy Hour early today...Merry Christmas,Bedford Falls!!
 
2001-12-25 1:42:59 PM  
hey Forsythe, I'm just across the bridge from you in SP.
Sittin outside drinking hot spiced apple cider with rum mmmm.
 
2001-12-25 2:01:19 PM  
You idiots. Just get an AK-47, like me! They're only $349...
 
2001-12-25 2:33:48 PM  
my brother made a nerf (TM) gun from a super soaker. gave a kid a welt on his arse.
 
2001-12-25 2:52:56 PM  
And some called the computer case modders childish geeks. These gimps who take kids toys far too seriously make them look like architects or something.

BUY AN AIR RIFLE OR SOMETHING!
 
2001-12-25 3:17:03 PM  
A hilarious link.

Thanks for the laugh, poster.
 
2001-12-25 3:36:08 PM  
In defence of Nerf, I'd like to add a few things:

-It's cheaper than paintball, by a ten-fold, and with the proper modifications, can be just as powerful
-You can play it anywhere-- indoors, in public parks, in the office, etc

And if you haven't seen anybody actually IN a Nerf war, I suggest you watch this video:
http://armageddon.nerfonline.com/movie/armageddon.shtml

It was shot at a Nerf war called Armageddon over this last summer, over 25 people showed up.
 
2001-12-25 5:24:45 PM  
"Nerfing community"?
 
2001-12-25 5:58:38 PM  
We used to hold Nerf Wars in the apartment complex I lived in in California. It was a hell of a lot of fun but not as great as Airsoft skirmishes
 
2001-12-25 7:56:12 PM  
Huh? Didn't even understand half of what he said, but he sure does talk purdy.

Think that I'll look for some scorpions to see if they'll fit in a french bong....

Happy Holidays to the other solitary farkers out there!
 
2001-12-25 8:56:47 PM  
its called a thumbtack on the end of the slug!
 
2001-12-25 9:02:34 PM  
ok i was almost excited for this... then i peeped the "leader" with the pony tail, sunglasses, black shoes, and the hip-pouch. i couldn't hang out with that guy, i'd never be able to take him seriously.

dude is probably smart and cool or whatever, but i'd always be waiting for him to break out the d&d storides, or tell me that he fragged his mother playing quake.

oh well
 
2001-12-25 9:05:19 PM  
hey karpage...

Boobies, duh. second post, "heard that appied to", what?

he who talks big should spell big too.
 
2001-12-25 10:01:38 PM  
Nice one, Pokey. He sure made a typo didn't he? ROFL
 
2001-12-25 10:08:38 PM  
pokey:

The integral of your mom is fat plus a constant, where the constant is equal to more fat.

Word to your mother.
 
2001-12-25 10:11:34 PM  
[image from students.uiuc.edu too old to be available]
 
2001-12-25 10:21:04 PM  
This stuff is straight out of a physics 1 textbook. I learned this a month ago
 
2001-12-25 10:39:18 PM  
Karpage:
I'm sure you've heard this before, but....


What do you get when you integrate 1/cabin * dcabin?

Natural Log Cabin!!!!! *nerdy laugh*
 
2001-12-25 10:58:52 PM  
karpage:

mom jokes... go figure.
 
2001-12-25 11:15:14 PM  
*sigh* i long for the days of blow-guns with the poison tipped darts.
 
2001-12-25 11:35:44 PM  
You don't need advanced physics to hurt people with a nerf gun, all you need to do is adjust your grip.
 
2001-12-26 12:37:21 AM  
Biledriver:
Why long for them, when you can attempt to bring those glory days back?

Just don't breathe the darts in...
Hate to see ya take yourself out before it's time.
 
2001-12-26 12:49:57 AM  
check out some of the pictures from armageddion 2001. these guys a farking nerds and a half.

Trouble with your sex life, then maybe you should see a therapist. Trouble with your Nerf wars and you have come to the right place. If your missing the thrill of the hunt or the high of a challenging battle fought well, then maybe you should try some of the war suggestions posted here by some of the best minds in Nerf....but mostly by you people.....


i bet they think they are witty, speaking of "sex" like that.
 
2001-12-26 2:01:51 AM  
I present to you:
M.I.R.A.C.N.G: the advanced chemical nerf gun.
Sure, adding springs and rubber band and all that is just dandy, but in then end, you just cant get the proper velocity without something unorthodox. I thought about ways that you could modify a nerf gun to get acceleration using conventional, minor modifications and tested them, and was unsatisfied with my results. I needed a better nerf gun, and the modifications would need to be to more than just the gun itself, ammunition would have to be modified as well for better velocity, more on that later.

My brainstorm hit a moment of glory when I thought of car engines. By burning a flammable material in an enclosed chamber you can produce some truly RIGHTEOUS pressures, in a cars case enough to propel it great distances.

My design was this: a small extremely pressure resistant chamber would placed in the barrel of a nerf gun with a finely crafted piston being driven forward in the barrel into the ammunition plunger, forcing the ammuntion from the barrel at high velocities.

Gasoline would obviously be a choice for a propellant, but alas, it requires far too much to be carried around,(gallons of gas DONT pressurize well) I dug out my basic chemistry textbooks and started reading.

High-yield exothermic reactions were the key to all this. Thermite is one of the most famous high-yield exothermic reactions, and for awhile I debated using thermite for the propellant, but problem arose because thermite tended to heat the pressure up in such a way that the thermite would ignite prematurely in the pressure chamber, before the piston had a chance to retract properly. Because of this my first tests with thermite propulsion led to erratic firing rates/powers, they also revealed another thing: aluminum slag coating the pressure chamber and the pistons grooves interferes greatly with smooth operation: by the end of the fifth shot my gun was a welded mess. It was time to go back to the drawing board.

The most high yield exothermic reaction (the most energy yielded from direct molecule to molecule contact) known to man is the reaction between flourine and hydrogen. This reaction makes thermite look like childs play, and creates as a result hydrogen flouride, which turns into hydroflouric acid(Nastiest acid out there) on contact with human skin. This is exactly the kind of shiat I love to play with.

Flourine gas isnt something I wanted to be carrying around, so instead I decided I would have to devise a system to make it on the spot. Sodium Hexaflouride makes flourine gas when its run over a 40000 volt arc (which isnt much, static shocks can hit 50000 easily) so filtering sodium hexaflouride gas through filter paper coated with a layer of iron and electrified would make enough (if slopily) flourine gas in the barrel of my gun to produce a very hefty reaction. Hydrogen is relatively safe to carry around in tank form provided you dont REALLY bang it hard. Overheating wouldnt be a problem if I flushed the barrel with high-pressure hydrogen after each shot. BAM: I had a system by which to make a relatively clean reaction ON site.
Next I needed a piston with valves. A friend hooked me up with the piston and housing to some sort of engine. It obviously wasnt a car engine because the whole piston/casing assembly was only 4 inches in diameter and about 10 inches long, more than small enough to fit in a large nerf gun or super-soaker housing. It had 4 1 way valves on it with more than enough strength to withstand the kind of pressure I were putting on it (well, maybe not more than enough, but it was enough) I set about having the piston housing encased in a half inch of banded stainless steel, It made the thing heavy but was a lot better than the risk of having it explode in my faces.

I used some of the heavy duty insulated fuel delivery hosing used in old aircraft to deliver my noxious mixture to the pressure chamber, there was just big enough a space to insert my iron crusted filter and the wires connecting it to my 80000 volt Tazerboy (I eventually selected the tazerboy because we had one on hand, there are probably a LOT better ways to do this) The two wires were kinked with a modified garden hose valve and spoon welded together into a rudimentary brace (again, it worked, blah blah) so that you would only have one valve to open. This whole assembly was mounted into an old nerf gun housing (dont ask me the model, it was one that was supposed to shoot balls with a multi-barrel chaingunny thingee) I removed the old ball delivery system and mounted instead a bit of pvc pipe over the piston, into which I inserted a plunger from another nerf gun. I then glued this to a conical piece of plastic that fit neatly over the old barrel hole and glued and duct taped the long piece of plastic micro-darts are usually mounted on to the end of that. by this point the gun looked pretty wacky.
The piston was braced from flying from the gun by the extra steel casing we placed on it and the plunger was driven up the tube by force of the explosion behind it. At this point I realized it needed something to spring the piston back into place after each shot, so with much hardship I managed to force the mother of all springs into the casing, where the pison meets the second layer of banded steel.
The only thing left to do was to make an exhaust system so that I didnt get noxious chemicals all over myself. I drilled a fifth hole in the casing near the tubing and attached a valve. seperate tube and a small tank filled with absorbtive resin bars to this. I'll post pictures as soon as I can but the gun looked positively WIERD by now.

| -hollow tube for dart launching
|
/ \
/ \ ----conical, cosmetic piece
_/|___|\_
| =| @ | |----inside there is the plunger and PVC
| | @ | |
| | @ | |----plastic nerf gun body
| | @ | | ______
#| | |_|___{ }
#| |=====|_ ___ } ---resin tank
#| |=====| | {_______)
|__|___|__| #
========= # is the tazer,
\\ # taped to the side
\\
\\--hoses leading to pressure
\\ tanks

The thing wasnt light (gun was 13 pounds and the tanks were 20, or easy to use, but using our modified ammunition (Micro-darts with then ends capped with the fingers of latex gloves filled with knox gelatin) me and my test crew AKA buddies managed to get a range of over 200 meters with this thing, TWO HUNDRED. a modified version of it with a rifled PVC barrel managed to fire a frozen orange through a 5 inch thick piece of plywood. This thing is killer, and best of all: its NERF.


-Evilscientist
 
2001-12-26 2:02:27 AM  
Note to self: never attempt ascii art on fark *curses*
 
2001-12-26 2:22:38 AM  
Is this what you were aiming for?

| -hollow tube for dart launching
|
/ \
/ \ ----conical, cosmetic piece
_/|___|\_
| =| @ | |----inside there is the plunger and PVC
| | @ | |
| | @ | |----plastic nerf gun body
| | @ | | ______
#| | |_|___{ }
#| |=====|_ ___ } ---resin tank
#| |=====| | {_______)
|__|___|__| #
========= # is the tazer,
\\ # taped to the side
\\
\\--hoses leading to pressure
\\ tanks


PRE. The wonder tag that works wonders (for ASCII art, anyway).
 
2001-12-26 2:23:02 AM  
Or not.
 
2001-12-26 3:29:18 AM  
Just play paintball, Silly.
[image from mrpl.org too old to be available]
 
2001-12-26 3:36:00 AM  
Paintball doesnt allow you to develop weapons systems that can put a frozen orange through 4 inch plywood, which we eventually did with this thing... It isnt about playing the game, its about blowing shiat up!
 
2001-12-26 3:53:54 AM  
And dont say you can either, last time I modified my paintball gun I almost got a lawsuit from an angry mother who's kids tooth I had broken and got kicked from the range for violating feet per second.
 
2001-12-26 11:37:29 AM  
If the video had topless women playing I'd be interested.
 
2001-12-26 1:32:11 PM  
Evil You've got big problems, dude.


You're one step away from Tim McVeigh.
 
2001-12-26 2:02:58 PM  
This is so pathetic.

I remember those stores in Europe where you can buy knives, slingshots, binoculars, stun-guns, walkie-talkies, everything and anything but guns.

Pathethic. Is that what castration is like?

If you want some fun, build a hand-grenade and strap it to an over-powered model rocket.

Run when you hear sirens.
 
2001-12-26 5:38:10 PM  
Im sorry, but you guys sound like serious retards. How can you evaluate nerf if you haven't even played it?
 
2001-12-26 9:29:50 PM  
Agreed. It's sad. Most of us simply do not have nearly enough money to buy paint balls frequently enough to make it fun. I'll probably never do paintball, Airsoft looks much better, easier to find weaponry a n00b could afford.
 
2001-12-27 12:03:24 AM  
Also, I think hardly any of you have any idea about what it is to Nerf... You have no concept of what a Nerf warrior does, no common reference will allow you to understand. It can be compared to nothing else... except Airsoft maybe.
 
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