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Registered Member #81
Joined: Thu Feb 09 2006, 11:57AM
Location: Paris, France
Posts: 43
Considering that *almost* everybody here on 4hv has been confronted with limitations of coilguns and railguns, has anybody explored new means of propelling projectiles ?
For example, I have tried exploding aluminium wires recently, outside and underwater. Exploding wire is a very complex phenomenon and is under numerous lab studies. After some google research, it seems that it could be employed in propulsion. Try "exploding wire propulsion" or "exploding wire gun". Etc (electrothermal) guns seem to employ the exploding wire technique too. Looking for patents is interesting too : http://www.google.fr/patents?id=9x4gAAAAEBAJ&printsec=abstract&zoom=4&dq=hydrogen+propelling+projectiles#PPP1,M1
So this post could be a start for giving new ideas to the community, and perhaps if anybody is interested it could restart research in propelling projectiles in 4hv, because coilguns and railguns doesn't seem to generate amounts of new threads nowadays.
Registered Member #90
Joined: Thu Feb 09 2006, 02:44PM
Location: Seattle, Washington
Posts: 301
Interesting, thanks for bringing this up ... Have you seen any ballpark figures for energy conversion efficiency? I am very curious to hear how it may compare, even if it is just theory so far.
Cheers, Barry If resistance is futile, is resistance in parallel even more futile?
Registered Member #81
Joined: Thu Feb 09 2006, 11:57AM
Location: Paris, France
Posts: 43
I don't have any further informations.
But what I know:
-Electo Thermo Chemical guns are under heavy research in some kind of skunk works labs in France like there and worldwide. Looking for patents, it employs exploding wire technique for plasma generation into conventional gun propellants.
It seems to be the best way nowadays
We can also make up our minds considering that :
-Exploding wires produce blast waves, plasma, heat and if you swing it right, probably thrust
-water vapor can propel projectiles at high speed. Light gas guns use hydrogen for example. I found a comparison chart in a patent. So why not atomising water via exploding wire, sparkgap discharge ... , using cap banks to propel projectiles. It's easy for us outta there
-Exploding aluminium wires or powder underwater produce hydrogen. Hydrogen is used in LGG (light gas guns). It is explained in the patent cited before and it's a clever idea.
-Seems to work in theory
-Amonts of patents are available to make our brains boiling
Registered Member #179
Joined: Thu Feb 16 2006, 02:08AM
Location: Hagerstown, Maryland - Close to Prime Outlets
Posts: 287
I built an electrothermal water gun with limited success....I was not exploding a wire, but just using the plasma arc under water to create thrust to propel the projectile. The problem I was having was it was working *too* well for the materials I had...the soldered copper pipes were bulging and contorting, and the solder was breaking apart. I did have projectiles shooting before the gun self destructed. Once I get my 24kj bank complete, I may have to revisit this on a more massive scale, such as a long piece of exploding wire under water
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New means of propelling projectiles
