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  Final design being done on "Project Cobra"

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Author Topic:   Final design being done on "Project Cobra"
Dr Cyclops
Super Geek

Posts: 100
From: rio rancho NM USA
Registered: Nov 2001

posted February 23, 2002 13:03     Click Here to See the Profile for Dr Cyclops     Edit/Delete Message   Reply w/Quote
My little rail gun experiment. I'll keep y'all updated on it's progress.

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ZorroTheFox
SuperBlabberMouth!

Posts: 1178
From: Milton, WA, USA
Registered: Oct 2001

posted February 23, 2002 21:49     Click Here to See the Profile for ZorroTheFox   Click Here to Email ZorroTheFox     Edit/Delete Message   Reply w/Quote
fire away captain.......Z

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Dr Cyclops
Super Geek

Posts: 100
From: rio rancho NM USA
Registered: Nov 2001

posted February 24, 2002 05:52     Click Here to See the Profile for Dr Cyclops     Edit/Delete Message   Reply w/Quote
Will do! In theory this thing should revolutionize modern warfare.

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shogarde
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Posts: 65
From: hmm...let's see. there's a leprichaun talking to me, maybe i'm in ireland
Registered: Feb 2002

posted February 24, 2002 14:39     Click Here to See the Profile for shogarde   Click Here to Email shogarde     Edit/Delete Message   Reply w/Quote
um.. what exactly is this?

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Dr Cyclops
Super Geek

Posts: 100
From: rio rancho NM USA
Registered: Nov 2001

posted February 24, 2002 16:37     Click Here to See the Profile for Dr Cyclops     Edit/Delete Message   Reply w/Quote
Oh you'll see. Bwa ha ha ha!

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Dr Cyclops
Super Geek

Posts: 100
From: rio rancho NM USA
Registered: Nov 2001

posted March 02, 2002 05:42     Click Here to See the Profile for Dr Cyclops     Edit/Delete Message   Reply w/Quote
Electric work almost done. Am i put in a special file if i buy 40 relays at once?

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quantumfluff
Highlie

Posts: 675
From: the ether
Registered: Jun 2000

posted March 02, 2002 06:46     Click Here to See the Profile for quantumfluff   Click Here to Email quantumfluff     Edit/Delete Message   Reply w/Quote
No. Relays are used for too many things. Are they going to switch fast enough for this application? You're going to have to carefully check the switching time against the acceleration of the projectile and make sure the power handling capacity is adequate. Power switching transistors may be a better bet.

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Dr Cyclops
Super Geek

Posts: 100
From: rio rancho NM USA
Registered: Nov 2001

posted March 03, 2002 06:18     Click Here to See the Profile for Dr Cyclops     Edit/Delete Message   Reply w/Quote
I don't really know too much about transistors. these relays should work...

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EngrBohn
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From: United States
Registered: Jul 2000

posted March 03, 2002 11:35     Click Here to See the Profile for EngrBohn   Click Here to Email EngrBohn     Edit/Delete Message   Reply w/Quote
(famous last words)

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cb
Oooh! What does this button do!?

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quantumfluff
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Posts: 675
From: the ether
Registered: Jun 2000

posted March 03, 2002 20:04     Click Here to See the Profile for quantumfluff   Click Here to Email quantumfluff     Edit/Delete Message   Reply w/Quote
EngrBohn: (famous last words)

LOL. Yeah, but in this case I think if they don't switch fast enough he'll just get a slow moving projectile. That's a lot safer than one moving much faster than you expected.

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fussili
Newbie

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From: Hong kong
Registered: Feb 2002

posted March 04, 2002 03:42     Click Here to See the Profile for fussili   Click Here to Email fussili     Edit/Delete Message   Reply w/Quote
do you mean as in 2 rails with a HUGE dc current passed through them in an electric field?

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Dr Cyclops
Super Geek

Posts: 100
From: rio rancho NM USA
Registered: Nov 2001

posted March 04, 2002 15:07     Click Here to See the Profile for Dr Cyclops     Edit/Delete Message   Reply w/Quote
Sorta Kinda. The specifications are: 10ftX20mm barrel, 120 electromagnts "spikes" divided into 40 seperate "rings". hands are horribly cut and bruised-might not have enough wire-realizing wrapping 120 Emags might be a slight pain in the ass.

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EngrBohn
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posted March 04, 2002 16:15     Click Here to See the Profile for EngrBohn   Click Here to Email EngrBohn     Edit/Delete Message   Reply w/Quote
- Dr Cyclops -
My little rail gun experiment.

I seem to recall you mentioning (in a different thread) that this is for a school science fair. I'd like to suggest that for the science fair, you redesignate it as a "functioning model electromagnetic mass launcher".

That way, you don't have to worry about The Authorities fretting over a student building a "gun". And it's plausible -- an EM mass launcher is (theoretically) a remarkably cheap way to boost a satellite to an altitude where a standard upper stage can place it in a decent orbit (assuming you can convince someone to let you borrow their mountain).

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cb
Oooh! What does this button do!?

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Atmosphere
Maximum Newbie

Posts: 16
From: St. Louis, MO
Registered: Mar 2001

posted March 04, 2002 19:41     Click Here to See the Profile for Atmosphere     Edit/Delete Message   Reply w/Quote
How about some pics?

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Max Heck
Geek-in-Training

Posts: 38
From:
Registered: Aug 2001

posted March 04, 2002 22:16     Click Here to See the Profile for Max Heck   Click Here to Email Max Heck     Edit/Delete Message   Reply w/Quote
Dr. Cyclops:

Details! Details! Electromagnetic mayhem is one of my favorite topics!

If you're winding coils, then it sounds more like you're building a coilgun. A railgun is much simpler, basically two parallel bars of copper or aluminum, a whomping big capacitor bank and a very fast high-current breaker.

Not to kibitz, but I'm pretty sure relays aren't going to be able to open and close fast enough even to move the projectile down the length of the tube. You might want to learn about Silicon Controlled Rectifiers (SCR's) They're just the thing ya need, and they're not difficult to use.

Keep us posted!

Max.

Here's some links:

http://www.oz.net/~coilgun/home.htm

http://www.jamespaul.clara.net/coilgun/index.html

http://web2.airmail.net/jd4usa/

http://www.railgun.org/

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macadddikt18
SuperBlabberMouth!

Posts: 1264
From: In a world beyond your understanding
Registered: Jan 2002

posted March 05, 2002 07:51     Click Here to See the Profile for macadddikt18   Click Here to Email macadddikt18     Edit/Delete Message   Reply w/Quote
looks very impressive. Keep up the good work.
Nayt

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Through out your life you will wonder who THEY are. Then you find out who THEY really are. From then on you live you life in fear of THEM and you wish you never knew who THEY were.

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shogarde
Geek

Posts: 65
From: hmm...let's see. there's a leprichaun talking to me, maybe i'm in ireland
Registered: Feb 2002

posted March 05, 2002 15:11     Click Here to See the Profile for shogarde   Click Here to Email shogarde     Edit/Delete Message   Reply w/Quote
Hehe.... I'll just grab me one of these and a pair of digital cammies and I'll be set for destruction.

I wonder if they'll make a paintball gun like this...

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I are moose octopus, I having much buttons to push. So many buttons...

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Dr Cyclops
Super Geek

Posts: 100
From: rio rancho NM USA
Registered: Nov 2001

posted March 06, 2002 14:02     Click Here to See the Profile for Dr Cyclops     Edit/Delete Message   Reply w/Quote
Okay so its not a rail gun i'm building. but it isnt a coil gun either. mine actually has steel cores (3) every three inches. the cores are perpendicular to the outer shell and hold in the inner "barrel". Did i invent this without even thinking about it?

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Dr Cyclops
Super Geek

Posts: 100
From: rio rancho NM USA
Registered: Nov 2001

posted March 20, 2002 15:22     Click Here to See the Profile for Dr Cyclops     Edit/Delete Message   Reply w/Quote
Okay, scratch that about the electric work. it just wasnt happning. back to the drawing board. I'm looking into: SCRs, Hall effect switches, and timer ICs (i don't know how the hell any of these really work!)

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Max Heck
Geek-in-Training

Posts: 38
From:
Registered: Aug 2001

posted April 05, 2002 13:28     Click Here to See the Profile for Max Heck   Click Here to Email Max Heck     Edit/Delete Message   Reply w/Quote
Dr. Cyclops:

Hie thee hence to your local Radio Shack store and ask for the "Engineer's Notebooks." They're little booklets (they used to have one big one) written by a guy named Forrest M. Mims III. They're well written, explain things from the ground up, and they're chock-full of practical examples. The big book I started out with years ago has umpteen million notes and soldering-iron burns on it, and I *still* keep it by my workbench. I highly recommend them for electronic-geeks-in-training.

At a minimum, get the one on the 555 timer chip (one of the most useful chips ever, one of my faves!) and I think they have one on power control circuits and another on optoelectronics. You don't want to use hall effect sensors, that would be kinda like using an ultrasensitive parabolic microphone at a Metallica concert. By definition, an EM gun is putting out monster magnetic fields. What you need is an optical sensor to tell where the slug is in the gun barrel. You can get some off-the-shelf modules from Hewlett Packard Opto and others that have gaps of up to 1 inch or so.

Good luck!

Max.

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