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4hv.org :: Forums :: Electromagnetic Projectile Accelerators
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2.3kj Completely Self Contained Induction Cannon (Pics Inside)

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FastMHz
Tue May 06 2008, 07:54PM Print
FastMHz Registered Member #179 Joined: Thu Feb 16 2006, 02:08AM
Location: Hagerstown, Maryland - Close to Prime Outlets
Posts: 287
I've been collecting parts for this project for a while...and with the 24kj system taking most of my time, this one went largely on hold for a while. But I now have everything I need, and have built the enclosure. The capacitors are two 400v @ 14400uf lytics (HUGE!!). They will be charged off a 12v 5ah gel cell, and discharged via SCR. A 3.5" induction pancake coil will be affixed to the front of the "cannon". The entire unit can be picked up and carried like a large spud gun, except it shoots aluminum slugs with ferocious power.

All that is left is wiring. I'll be posting images and video as I get the system done.
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rp181
Wed May 07 2008, 12:24AM
rp181 Registered Member #1062 Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
how are you going to charge( boost voltage)? Can you post the SCR's Data sheet? is it a stud?
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FastMHz
Wed May 07 2008, 03:10AM
FastMHz Registered Member #179 Joined: Thu Feb 16 2006, 02:08AM
Location: Hagerstown, Maryland - Close to Prime Outlets
Posts: 287
Yes, it's a stud. Charging is accomplished via 12v --> inverter --> transformer --> diode --> caps. A hair dryer element is in series with the transformer primary to ballast it. Charges in about 1.5 minutes. I'm keeping this as simple as possible. The SCR is the same that I was using in my 3.5 kj bank, so I know it'll be fine. Data sheet on my blog:

http://fastmhz.com/?p=11
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Andyman
Wed May 07 2008, 05:20AM
Andyman Registered Member #1083 Joined: Mon Oct 29 2007, 06:16PM
Location: Upland, California
Posts: 256
Sounds awesome! Get us some pics of those capacitors, and of course the rest of the setup/parts!
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FastMHz
Wed May 07 2008, 11:27PM
FastMHz Registered Member #179 Joined: Thu Feb 16 2006, 02:08AM
Location: Hagerstown, Maryland - Close to Prime Outlets
Posts: 287
Here are some pics of the project:

Img3882ew0
The capacitors...they're quite large!!

Img3878fn9
How everything will be fit inside...I just have it laying there for design purposes at the moment.

Img3877bh8
What it looks like...all that induction firepower in a handheld cannon cheesey

An induction coil will be affixed to the front end.


[Edit: Maximum 400 pixels]
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rp181
Thu May 08 2008, 01:21AM
rp181 Registered Member #1062 Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
those capacitors are a beast. how much did they cost?
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Firefox
Thu May 08 2008, 01:22AM
Firefox Registered Member #1389 Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346
Wow! Those caps are absolutely massive. How did you go about getting a single cap that has more energy than my entire photoflash collection (at 220 pieces ~1kJ @ 300V)? Thats definitely nothing to sneeze at. Out of curiosity, since these are electrolytic, how do you plan on protecting them from the ring back, so they don't explode in your hands?
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FastMHz
Thu May 08 2008, 01:33AM
FastMHz Registered Member #179 Joined: Thu Feb 16 2006, 02:08AM
Location: Hagerstown, Maryland - Close to Prime Outlets
Posts: 287
I will be using a gigantic clamping diode to short the reverse charge supplied by the coil's collapsing field as I did on my 3.5kj system.

Those caps were my SOTY (score of the year) on eBay in 2007 wink The seller had the title mispelled.
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Quantum Singularity
Fri May 09 2008, 12:17AM
Quantum Singularity Registered Member #158 Joined: Sun Feb 12 2006, 09:53PM
Location: Central Ohio
Posts: 282
Great job man. Looks rather large for hand held - is this going to be a shoulder-mounted launcher like a bazooka?
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FastMHz
Sat May 10 2008, 03:56PM
FastMHz Registered Member #179 Joined: Thu Feb 16 2006, 02:08AM
Location: Hagerstown, Maryland - Close to Prime Outlets
Posts: 287
I suppose you could hold it on your shoulder, but I'm going to hold it at waist level. It's 33" long and 5.75" square. I'd rather not have those caps right next to my head...
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