do the regs cover coil guns

Anyone ever try to launch using a magnetic coil gun in place of an engine?
The design covers use of a electromagnet, driven by a charged bank of large
capictors, charged using batteries. the rocket would be fitted with aluminum
rings which are shoved by the magnetic field.
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If this could work the recovery deployment could be by way of altimiter.
That is if it were heavy or tumble if not.
any thought as to the rules that may govern such a model
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The projectile would be the problem. The article states that the projectile must be ferromagnetic (iron or alloy construction). There will be some idiot in Washington that would call this a firearm or a destructive device due to the metallic content of the vehicle. Or the fact that the technology can be enhanced to power the vehicle to hypersonic speeds. This project is called a number of things including "Mass Driver, Gauss Rifle, Rail Gun". The magnetic trains in Japan work on a similar principle. They had to limit the train speed to 200 mph, it can go much faster.
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Mark & Deborah Lewis
Hmmm.... there aren't any goveernment regulations that cover such a thing as far as I know... similar things (as far as recovery) have been done with boosted-darts: there was a writeup on ROL that I saw a while back... the unpowered "upper stage" was a PML "Cirrus Dart" with an extra nosecone (modified to engage alignment features on the booster) on the rear; recovery used electric ejection by way of a conventional HPR altimeter. (I forget whether dual deployment was used.)
The coilgun idea sounds interesting... acceleration forces might be abit extreme to achieve practical rocket performance, though...
-dave w
Reply to
David Weinshenker
Hobby electromagnetic ballistics?
Does 'rocket' not entail the propulsion device being contained within the vehicle? I can't see having the coil and supply on the rocket being a good idea (too heavy).
Reply to
Niall Oswald
This is an argument against gravity wells, not mass drivers.
Also read the book "The Moon is a Harsh Mistress". They use gravity well weapons there too.
"How are we going to fight?" "We're going to throw rocks." "No, seriously." "Yes, seriously."
It's on topic too. They launch ore-filled rockets at earth, and purposely lawn dart them from orbit. Terminal velocity impact at that speed resembles a nuke blast, but without the nasty radiation.
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DJ Delorie
Not aluminum rings. Iron or similar alloy. Must be susceptible to magnetic pull/push, which aluminum is not. Heavier metals... ferrous metals, I believe.
With current technology, the weight involved and the energy requirements would make it extremely impractical; you'd need an 18 wheeler to haul the launch equipment large enough to launch anything larger than 6 inches tall.
The videos on the site show a device that is 4 or more times heavier, but not much more powerful than, a B-B gun. I am sure others have come up with more compact and powerful variations, though, so I would not rule it out in the not-too-distant future.
~ Duane Phillips.
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Duane Phillips
Back to the coloring book for you!
Bob Kaplow NAR # 18L TRA # "Impeach the TRA BoD" >>> To reply, remove the TRABoD!
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Bob Kaplow
Forget it. If you scale it up enough to be useful, someone will decide it's dangerous or could be used as a weapon. (Weapon: something that if pressed against someone's face and activated, might cause them to be hurt).
Then they'll re-interpret an existing category to cover it ("Uh, it shoots something, so it must be a gun." or "Uh, you could put a needle on the end and inject someone with AIDS with that, so it must be a hypodermic!")
Either way, you won't be allowed to have it, no legislation required.
Reply to
Scott Schuckert
Aluminum rings *will* be repelled by an alternating magnetic field.
Lenz's Law states: An induced electromagnetic force generates a current that induces a counter magnetic field that opposes the magnetic field generating the current.
So, think of the aluminum ring as a one-turn secondary coil on a transformer. The coil is shorted, so maximum induced current will flow, resulting in maximum magnetic field generated. The induced magnetic field will directly oppose the magnetic field that induced it, and the ring will be repelled.
I did a demonstration of this for a science fair project in grade school, and won 1st prize. I used a short piece (1.5" long, .75" diameter) of aluminum pipe, rather than a ring, to allow me to more easily constrain its motion to one axis. It was a loose sliding fit over the plastic tube that covered the square steel core. The electromagnet was hand-wound from several thousand turns of "bell wire" (bare copper with a varnish coating for insulation), and connected to a 110 VAC line cord, with a momentary contact push button. When the button was pushed, it would throw the aluminum tube about 2 feet straight up in the air off of the 4" long plastic-encased steel core sticking out the top of the electromagnet.
Bottom line: all that was required was that the "ring" conduct electricity. Copper wire loops taped to cardboard tubes worked just fine, as well, but the aluminum tube made for the best "display".
For some reason, I had a knack for winning science fairs in grade school with projects that threw things in the air, blew up, etc. I wonder if I could get away with any of them in today's litigious "zero tolerance" world....
- Rick "Dust Explosion" Dickinson
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Rick Dickinson
Eddie currents will be generated in *any* conductive material in the presence of a changing magnetic field. There are plenty of practical examples of this at science 'museums' such as Questacon here in Canberra, Australia.
BTW a rail 'gun' is able to 'fire' a projectile which definitely *would* class it as a firearm in Australia. In the end it is the result that counts, not how you achieve it.
Bob Stephenson bstephenatnetspeeddotcomdotau
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I was not aware the FF rules on firearms and destructive devices in the gun control act covered metallic content of rockets.
they are a destructive device only if equipped with a warhead thhat I can find in my green book
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better stick to demonstrations of owl preserves and how they effect homo sapiens male mating habits.
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They don't.
The only regulatory "intersect" I can think of might involve the applicability of the FAA "model rocket" or "large model rocket" categories, which may among other things (IIRC) call for lightweight nonmetallic construction... but then, it's not clear that the device would constitute a "rocket" in the first place, since it is not propelled by expelling gas produced within it.
What _are_ the FAA rules, if any, for unpowered ballistic projectiles? (Do the "pumpkin throwers" apply for waivers or anything?) Legally, an unpowered coilgun-launched dart should be treated comparably!
-dave w
Reply to
David Weinshenker
GREAT , we can have those. thank the lord and the second amendment. so if it's a gun, bring em on !
those are handed out free on many streets by good will groups to prevent the spread of aids of all things.
I now really confused.
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