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Registered Member #158
Joined: Sun Feb 12 2006, 09:53PM
Location: Central Ohio
Posts: 282
Dont know if anyone is still watching this thread but I'll make a few comments...
Marko wrote ...
In order to match muzzle energy of 0.22 rimfire cartridge which is, according to wikipedia, 135J, you require something like 3kj cap bank which is size of a small desk and by no means portable.
135J isnt to much for a handheld coilgun IMO. I am working on a similar project myself. Its the velocity that is really going to get you. In my last IL my projectile hit 127J KE and thats without any real tuning and about 1/2 the energy of my cap bank. Sure my cap back is big, but no where near the size of a desk. And if thats all the energy I needed I could reduce it in half - shoe box sized maybe. Or even smaller if you are buying high end caps and not $4 ebay specials. The induction launcher style seems much easier to get higher power and faster velocites with a lot less control (meaning timing doesnt have to be precise, etc.). The problem with IL's is the easy way of doing it uses a flat pancake coil and similarly sized flat disk. Not very aerodynamic at all and difficult to use with a barrel. Other than the site linked already I havent seen many multi stage IL's. Thats something I will experiment with hopefully in the next year. Until then the single stage ones seem to work great if you can build a coil and housing to stand up to over a kilo-joule. And it wont be really small by any means. But perhaps sci-fi huge riffle like, something along the lines of the BFG in doom:
At least thats my goal to fit a high power induction riffle into something similarly shaped and sized, but my goal is something along the lines of 500fps+ but with a much larger aluminum slug.
I've got some good ideas I think and I will hopefully be working on them over winter. So I dont have anything really great as of yet. The biggest problem I will have that I see is getting a portable power supply for multi-kJ coilgun. I have to do some more searching in the past to find some schematics, since rules state you cant just ask for such. I suppose they'd rather you re-invent the wheel. But until I can come up with some kind of super duper boost converter or zvs or whatever they are called I am just going to use a small lead acid battery or gel cell and an auto 12VDC to 120VAC inverter. That would be the large and heavy way of doing it unfortunately, and with a portable gun, size and weight of course is of the utmost importance.
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Coil Rifle w/ very high velocity
The induction launcher style seems much easier to get higher power and faster velocites with a lot less control (meaning timing doesnt have to be precise, etc.). The problem with IL's is the easy way of doing it uses a flat pancake coil and similarly sized flat disk. Not very aerodynamic at all and difficult to use with a barrel. Other than the site linked already I havent seen many multi stage IL's. Thats something I will experiment with hopefully in the next year. Until then the single stage ones seem to work great if you can build a coil and housing to stand up to over a kilo-joule. And it wont be really small by any means. But perhaps sci-fi huge riffle like, something along the lines of the BFG in doom: 