3 Simple Ways to
Share What You Make

With Instructables you can share what you make with the world — and tap into an ever-growing community of creative experts.

PhotosPhotos

Share one or more photos of a project, recipe, or whatever you've made, quickly and easily.

Step by StepStep-By-Step

Share your step-by-step photos with text instructions of what you made so others can do it too!

VideoVideo

Share your how-to video. You'll need your embed code from a video site such as YouTube.

Make a poweful (green) railgun!

Make a poweful (green) railgun!
Disclaimer: I take no responsibility for anything that happens.

The goal of this guide is to show you how to make a railgun. Railgun's offer a green method of projectile acceleration, with minimal byproducts and waste. Railguns use electricity to propel a projectile. because of this, they create no waste.

In addition, the materials used do not pose a ecohazard, while the materials makes it very long life.

Depending on your resources, this project can be free, or up to 1000$.

Do not attempt this unless you have expiereance with high voltage and projectile's, this can be FATAL. You should know how to make one already. Vital information that is easy has been left out, I do not want everone to make oe and kill themselves.This is a guide on the order to do it, or if your skills lie soewhere else, and you do not know about one area. Emai me if you have any questions

Check out my rogowski coil, it was used in this: http://www.instructables.com/id/Make_a_Rogowski_coil/
 
Remove these adsRemove these ads by Signing Up
 

Step 1Obtain parts

obtain parts
Here is a parts list:
1)capacitor bank. I used 18 400v 3900uf capacitor's in parallel. This comes out to 5600 joules. Make sure you stay above 300v, and below 600v.
These are harmless to the enviornment. They are aluminum based.
2)busbars. I used aluminum.
3)3 120uf 300v capacitors.
4) 60A 600v diodes
5)cable's. I used 00 AWG
6)rails. Copper bars here
7) 2"x.5"x12" aluminum.
8)projectiles. Make it close tolerance.
9) A railgun enclosure. I suggest designing your own. It should have a .5" bore, with strong materials.
Mines GREEN! both ways!
Email me if you want a design (ravigaddipatiravi@yahoo.com)
10) misc. support equipment.
11)PVC for injector. Use your own design. Look up "spudgun" for ideas.

« Previous StepDownload PDFView All StepsNext Step »
103 comments
1-40 of 103next »
Dec 13, 2011. 6:45 PMtom10122 says:
hey , i wanna use a 9 volt cause theres no chance ill be allowed to use an outlet since i already tripped the breaker a few times if i wired two volatge triplers together would it work? also do the caps have to just be greater then the input coltage or do they need to be greater then the output voltage?
Mar 18, 2012. 9:58 PMjj.inc says:
Well, you could use a camera flash, although those take a second to recharge capacitors the size of my thumb, so maybe you should get your own 15 amp breaker so maybe an amp limiter.
Feb 16, 2012. 2:11 PMthanatos370 says:
You want a big gun? use 3/4 in. solid steel projectiles. that will pack a punch.
Nov 17, 2011. 10:16 PMjj.inc says:
This looks just like one they showed on the Science chanel
Dec 5, 2011. 1:19 PMnathanielg says:
this is the one from there.. you can check out more of the details at powerlabs.org
Dec 5, 2011. 5:05 PMjj.inc says:
SWEET
Oct 17, 2011. 7:53 PMjj.inc says:
So why 300v < voltage < 600v
Sep 18, 2011. 7:48 PMd3monhax0r says:
When you say "Connect the voltage doubler to the bank, and take it to your banks peak voltage. Hold it there overnight, it will help your capacitor's." do you do it only once? or all the time?

Also, for the voltage tripler, will it constantly triple and charge up the capacitor? or only triple the amount of voltage you give it?
Feb 22, 2010. 10:22 AMREA says:
just currious, what would happen if you were to use a 9000uf capacitor? =D
Sep 11, 2011. 2:56 PMM4industries says:
The microfarads would not be OVER 9000!
Jul 12, 2011. 10:13 AMdrozzle says:
Really, that's not that big.
Jun 16, 2010. 6:26 PMNicholai says:
with enough of them, PWNAGE!
Jun 16, 2010. 8:15 PMREA says:
hmm... only problem is it would take an enormous amount of energy to charge it. but the space/time shattering power would be simply beautiful!
Jun 8, 2011. 7:00 AMtazerboy says:
Also, GreenD having a 350volt 330uf capacitor is very weak,( around 20joules). Especially, when you are trying to make a railgun, because railguns are not that
efficient in the first place.I would recommended at least 100 joules( three 450v 470uf), to get some effective muzzle energy.
Jul 12, 2011. 2:36 PMdrozzle says:
Railguns are much more efficient than traditional firearms. A well made medium size railgun can have around 30kj of force, that is almost as much as the worlds largest rifle.
Jul 12, 2011. 7:03 PMtazerboy says:
yes, but you are forgetting that i am talking about a railgun powered by 20 joules,
and when you said 30kj I believe that is how much the energy the capacitor bank produces, and not the railgun. Due the fact that the largest rifle produces around the thousand joule range or a tiny bit higher. not nearly as powerful as 30,000 joules. However i could be wrong, can anybody attest or object?
Jun 9, 2011. 9:57 PMalphapyr0 says:
those sized cacitors will work your power supply and transformer are what depended upon for the output to launch the projectile.
but the capasitors alone are yes pretty weak.
Jul 12, 2011. 7:04 PMtazerboy says:
true that.
Oct 18, 2010. 5:45 AMBOOM5601 says:
I'm thinking about doing a railgun as a launching system for ramjet powered aircraft for my next science project, any tips?
Oct 19, 2010. 9:32 AMBOOM5601 says:
I'm going to make a straight pulsejet for the ramjets, which isn't the same as the fancy schmancy ones they have now, but it will serve my purpose.
Jul 12, 2011. 10:11 AMdrozzle says:
A pulsejet is not a ramjet. And to launch one from a railgun you would need a very large railgun.
Nov 4, 2010. 8:42 PMSpeedmite says:
Just remember, Your launching this thing. This was firing ball bearings. How big you makin this? And your running electricity through it. Simpler way to lauch that.
Jun 8, 2011. 6:50 AMtazerboy says:
well, as long as his rails fits nicely with the projectile there shouldn't a problem
with the arcing. However you gotta admit having plasma arcs with the projectile looks pretty damn cool.
Jun 2, 2011. 3:26 PMGeneral Eggs says:
do you need to use resistors for any part of this? I'm making a small scale one for a science project.
May 4, 2011. 1:06 AMARJOON says:
big trouble. i have all parts except that i don't have enough capacitors. most sellers won't ship them to mauritius and i only have 2 6400uf 450v caps
Jan 22, 2011. 10:49 PMsandito says:
I've been posting a lot but if you are going to go to a link I posted go to this one--->http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=200440174628&ssPageName=ADME:X:eRTM:US:1123

It is a 400v 2700uF capacitor and even though the listing says one, I emailed the company and they have hundreds!
Jan 18, 2011. 7:45 PMsandito says:
I finally found the exact ones that are in this instructables,
go to this link ---------> http://www.futureelectronics.com/en/Technologies/Product.aspx?ProductID=ELX401LGN392TEB5MUNITEDCHEMICON7574593

Jan 17, 2011. 8:39 PMhobohitler says:
http://www.sourceesb.com/Distributors/United-Chemi-Con-UCC.asp

go to this link and you will find all the distributors of these capacitors and I found a few in my city which means I don't have to buy online.
Jan 8, 2011. 8:02 PM_Scratch_ says:
Are you really worrying about pollution when firing a projectile of any sort? Just sayin..
Dec 3, 2010. 3:47 AMTh3Ob3rst says:
I was actually thinking of making a sort of low-power railgun. Possibly also small caliber. The reasons are many: smaller currents, so smaller capacitors, smaller forces involved. Sure thing i would get much smaller speeds, but i'm not looking for an high speed railgun.
My idea would be something the more portable i can make it, and obviously efficient, even if low powered.

Any opinion? Is this a wrong approach?.

P.S. One of the reasons I want to go with low power is that, although i have some experience with circuits, capacitors and even moderately high voltages, this would be my first rail gun and I don't want to aim high and risk screwing up everything.
Apr 30, 2010. 8:35 PMMrMadmonkey4 says:
i wounder if this is even leagal. the army hardly uses railguns
Nov 27, 2010. 4:09 AMponolee says:
Yes it is legal, but u should check ur individual state laws for firearm usage. And the navy uses it not the army. Well I mean they dont use it but they are developing it.
Aug 3, 2010. 10:00 AMjobergy says:
Ok so im a bit new with electronics but i have some ideas to make a rail gun more efficient and what not... my problem is i have no idea what to look for in a capacitor for this type of application, or where to find one of this sort... i was just going to pick up a couple car audio capacitors. but looking through some of these comments made me think otherwise, so am i looking for more farads or for more volts (i saw the not above 600 volts and wondered why)? can you help me out?
Nov 27, 2010. 4:05 AMponolee says:
You want high voltage but a quick discharge
Aug 6, 2010. 10:32 PMgeek10102 says:
WHERE YOU GET THOSE CAPS AT MAN THEY DONT COME CHEAP DO THEY I'VE LOOKED
Nov 27, 2010. 4:04 AMponolee says:
It all depends where u buy them
The humongous ones can cost like 50 each
Aug 12, 2010. 11:17 AMgeek10102 says:
thx your a life saver
Nov 25, 2010. 10:38 AMAndy1312 says:
Could you please explain the voltage tripler a bit more? I love this instructable, but I don't quite understand the tripler. I've working on building one, and that's sort of a key part.
1-40 of 103next »

Pro

Get More Out of Instructables

Already have an Account?

close

All Steps Viewing
View all steps of an Instructable on the same page when you're a Pro Member.

Upgrade to Pro today!
5
Followers
2
Author:rp181