alternate power
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Novacastrian
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In a word HYBRID
I would not recommend building one without first constructing both a Pneumatic and Combustion.
Why not build a "Mini" Combustion?
Edit: Or a Coilgun, but they usually have nadda power. There are some railguns out there too.
I would not recommend building one without first constructing both a Pneumatic and Combustion.
Why not build a "Mini" Combustion?
Edit: Or a Coilgun, but they usually have nadda power. There are some railguns out there too.
America, the greatest gangster of all time. With 200 million odd foot soldiers at it's whim and call.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.
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Novacastrian
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They are only as dangerous as their owners or builders, kind of like owning a dog- they are what you want them to be.
If built properly a Hybrid is most probably safer for the user than any other spudgun. A "properly" built hybrid IS made out of metal, unless you fill it with nitrocellulose you are safe as houses, (unless you use a coke can for the chamber).
There are no other power sources except for steam that i know of and that would just be a pain. Other "sources" are not allowed on this forum i.e. Gunpowder, but if you are worried about Hybrids there is no chance that you would go down that path
In Conclusion, i can not help you
If built properly a Hybrid is most probably safer for the user than any other spudgun. A "properly" built hybrid IS made out of metal, unless you fill it with nitrocellulose you are safe as houses, (unless you use a coke can for the chamber).
There are no other power sources except for steam that i know of and that would just be a pain. Other "sources" are not allowed on this forum i.e. Gunpowder, but if you are worried about Hybrids there is no chance that you would go down that path
In Conclusion, i can not help you
America, the greatest gangster of all time. With 200 million odd foot soldiers at it's whim and call.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.
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Novacastrian
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Ok, what about a small rubber band powered "crossbow"?
I'm sure that there was one posted a while back, looked quite good too.
Maybe have a look through this http://www.spudfiles.com/forums/office- ... 11318.html
Hoped that helped.
I'm sure that there was one posted a while back, looked quite good too.
Maybe have a look through this http://www.spudfiles.com/forums/office- ... 11318.html
Hoped that helped.
America, the greatest gangster of all time. With 200 million odd foot soldiers at it's whim and call.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.
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jackssmirkingrevenge
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There's spring power but it's impractical for amateur builders.
For something really alternative, have a look at my airsoft crossbow - I made it using very basic tools and materials when I was 16, it should be easy to replicate or improve.
For something really alternative, have a look at my airsoft crossbow - I made it using very basic tools and materials when I was 16, it should be easy to replicate or improve.
hectmarr wrote:You have to make many weapons, because this field is long and short life
how about a a spud gun powered by a small nuclear reactor?? Ragnarok any ideas
<a href="">DONT TAZE ME BRO.. DONT TAZE ME... AHHHH</a>Yea, that's definitely going to get you at least a tazer.
facebook.com/biggrib
And on cue...
Well, other than combustion and pneumatics, other common launching methods include, stored strain energy (like in an onager, or crossbow), gravitational energy (like in a trebuchet), solid propellants (not safe, legal, or quiet, don't mess with them) or electric power.
Electric power can be split into two subsections:
- Electromagnetic
- Electrothermal
Electromagnetic can be spilt down further into reluctance, and inductance.
In simple terms, reluctance is using an attractive force, inductance a repulsive one.
Railguns and Thompson's coils are always inductive, coilguns can be either. When people normally talk about a coilgun, they're referring to a reluctant coilgun, using magnetic fields to draw in a steel armature (or projectile), but they can also be inductive, producing high currents within the projectile itself with sheer electromagnetic brute force (which creates a magnetic field), and then repelling that with the same field that created the currents in the projectile. That takes a lot more power, but it's also I believe how the world's fastest coilgun currently works.
Electrothermal cannons use electric power to create heat to expand gases to force a projectile with pressure. You can either heat the air with a vast spark, but that's obviously inefficient.
A common variant is the atomisation of water with a high power electric impulse. Basically, if you apply enough power to water quickly enough, it turns to steam almost instantly, and you can create huge pressures with enough application of power.
That brings me on to one last type of cannon. The steam cannon, which flash boils water in a fraction of a second, again, producing vast pressures.
That lists all the main ways I can think of to launch something. There are other ones, but those are the variants that a home hobbyist might be able to achieve.
For more info on Electric based acceleration, I'd advise taking a look around: http://www.powerlabs.org/emguns.htm
Also take a look at the atomisation of water section on the high voltage section of that site.
Well, other than combustion and pneumatics, other common launching methods include, stored strain energy (like in an onager, or crossbow), gravitational energy (like in a trebuchet), solid propellants (not safe, legal, or quiet, don't mess with them) or electric power.
Electric power can be split into two subsections:
- Electromagnetic
- Electrothermal
Electromagnetic can be spilt down further into reluctance, and inductance.
In simple terms, reluctance is using an attractive force, inductance a repulsive one.
Railguns and Thompson's coils are always inductive, coilguns can be either. When people normally talk about a coilgun, they're referring to a reluctant coilgun, using magnetic fields to draw in a steel armature (or projectile), but they can also be inductive, producing high currents within the projectile itself with sheer electromagnetic brute force (which creates a magnetic field), and then repelling that with the same field that created the currents in the projectile. That takes a lot more power, but it's also I believe how the world's fastest coilgun currently works.
Electrothermal cannons use electric power to create heat to expand gases to force a projectile with pressure. You can either heat the air with a vast spark, but that's obviously inefficient.
A common variant is the atomisation of water with a high power electric impulse. Basically, if you apply enough power to water quickly enough, it turns to steam almost instantly, and you can create huge pressures with enough application of power.
That brings me on to one last type of cannon. The steam cannon, which flash boils water in a fraction of a second, again, producing vast pressures.
That lists all the main ways I can think of to launch something. There are other ones, but those are the variants that a home hobbyist might be able to achieve.
For more info on Electric based acceleration, I'd advise taking a look around: http://www.powerlabs.org/emguns.htm
Also take a look at the atomisation of water section on the high voltage section of that site.
Does that thing kinda look like a big cat to you?
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jackssmirkingrevenge
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I always wanted to make something like the attached diagram, of course it wouldn't be at all portable but the power potential would be there. It's always how I imagined the dart-firing traps in Indiana Jones and similar would work. Such a system would be more likely to survive for centuries in a hidden tomb when compared to a tension powered device.gravitational energy (like in a trebuchet)
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- gravitypowered.jpg (14.24 KiB) Viewed 3778 times
hectmarr wrote:You have to make many weapons, because this field is long and short life
Simple = onager/treb/slingshot. Difficult (depending on who you are) electromagnetics 
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And JSR thats actually a good idea/theory. I mite put that to the test one day.
.And JSR thats actually a good idea/theory. I mite put that to the test one day.
Last edited by Twitcheth on Tue Dec 18, 2007 6:55 am, edited 1 time in total.
That would depend on how well the seals on that piston survived. If the seal was degraded enough and large amounts of air were esacping, you wouldn't get much power out of it at all.jackssmirkingrevenge wrote:Such a system would be more likely to survive for centuries in a hidden tomb when compared to a tension powered device.
Does that thing kinda look like a big cat to you?
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jackssmirkingrevenge
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if it was a stone piston that fit tightly in a stone chamber (I'm thinking primitive technology here) you wouldn't need seals at all, of course it would leak a bit but the pressure generated would be enough (given a large enough weight and piston) to propell a dart at lethal velocity into an unsuspecting grave robber.
hectmarr wrote:You have to make many weapons, because this field is long and short life
I always thought the lethal would come from a poison, and for that, you don't need much velocity. Blowpipes are fine, and that's only using a few psi from the lungs.
However, whether a poison would survive several hundred years is yet another matter. The next problem is if they've developed an antidote for it in that time.
However, whether a poison would survive several hundred years is yet another matter. The next problem is if they've developed an antidote for it in that time.
Does that thing kinda look like a big cat to you?