Yeah, coilguns are extremely naff in the projectile department.
The powerlabs one is possibly the biggest hobby one I've seen without getting off my virtual ass to find a better one, it occupies a table and chucks a 4.5g projectile at 66m/s with 10J of muzzle energy.
oooooh
*charges cannon and blasts a 25g slug off at 132m/s with 220J of muzzle energy*
Railguns are where military money is being thrown but to be honest they have equally dodgy drawbacks, like only being able to fire one shot before the whole thing needs rebuilding due to rail damage.
Anyone into Coilguns??
- elitesniper
- Sergeant
- Posts: 1090
- Joined: Sat Oct 13, 2007 8:40 pm
coil guns take to long to charge up
![Rolling Eyes :roll:](./images/smilies/icon_rolleyes.png)
![Shocked :shock:](./images/smilies/icon_eek.png)
![Rolling Eyes :roll:](./images/smilies/icon_rolleyes.png)
- singularity
- Corporal 5
- Posts: 982
- Joined: Mon Jun 26, 2006 10:53 pm
- Location: someplace
- Contact:
most people have turned to capacitors to energize the coils, they can be charged a lot high and faster than batteries, not to mention they discharge a hole hell of a lot faster. a 15,000v cap can be found quite easily i bet they are selling some right now on ebay. and a coil gun can take 3 sec to fully charge if you know what your doing and custom build the charging circuit
be sure to check out my <a href="http://www.spudfiles.com/forums/ak-styl ... 9.html">AK Styled Vortex Gun</a> and my <a href="http://www.spudfiles.com/forums/at-4-t9627.html">AT-4 Rocket</a>
upcoming projects... finalized clip fed BBMG and ball point pen sniper
upcoming projects... finalized clip fed BBMG and ball point pen sniper
-
- Sergeant Major
- Posts: 3197
- Joined: Wed Mar 28, 2007 9:48 am
- Location: Greenwood, Indiana
- Has thanked: 5 times
- Been thanked: 15 times
- Contact:
Damn, I hit the right answer almost exactly, well off by a factor of ~two but still, that is pretty good working from first principles.cwazy1 wrote:lol jimmy, that gun fires metal slugs at around 8g..the calcs for that gun has already been done on the WCA...its around 40m/s for the slug.
I estimated the BB at 3J.
An 8g slug at 40m/s is 6.4J
In fact, I bet my estimate is darn near exact for a BB. Spherical projectiles are the worst possible shape for a coil gun. So a BB would be expected to be a lot less efficient than a slug.
A basic combustion spudgun will fire a 100g spud with 500 to 1000 J of kinetic energy, that is typicall 100 times more energy than even a well built coilgun. Coilguns are cool, but you can usually throw the projecile with more kinetic energy than the coil gun can fire it.
![Image](http://www.inpharmix.com/jps/_images/JimmySpud_dyno_blue.gif)
- Fnord
- First Sergeant 2
- Posts: 2239
- Joined: Tue Feb 13, 2007 9:20 pm
- Location: Pripyat
- Been thanked: 1 time
- Contact:
Well, 1000 Joules is a bit much for a basic combustion. 500 is reasonable though.
The only difference between throwing and shooting is shooting is pretty much undetectable, since there is no obvious motion involved. So if your goal is to annoy school personnel, coilguns are the way to go![Smile :)](./images/smilies/icon_e_smile.png)
Plus, any cool science teacher will be able to appreciate a student who could make one.
The only difference between throwing and shooting is shooting is pretty much undetectable, since there is no obvious motion involved. So if your goal is to annoy school personnel, coilguns are the way to go
![Smile :)](./images/smilies/icon_e_smile.png)
Plus, any cool science teacher will be able to appreciate a student who could make one.
-
- Sergeant Major
- Posts: 3197
- Joined: Wed Mar 28, 2007 9:48 am
- Location: Greenwood, Indiana
- Has thanked: 5 times
- Been thanked: 15 times
- Contact:
1000 Joules would be a 100g spud moving at 462 FPS. Easily done with a basic combustion with a barrel of 5' or 6'._Fnord wrote:Well, 1000 Joules is a bit much for a basic combustion. 500 is reasonable though.
Heck, it wouldn't be all that hard to make a fairly basic combustion that would do 2000 Joules (100g at 656 FPS), an 8' barrel should be able to do that (with a properly sized chamber).
![Image](http://www.inpharmix.com/jps/_images/JimmySpud_dyno_blue.gif)
- Fnord
- First Sergeant 2
- Posts: 2239
- Joined: Tue Feb 13, 2007 9:20 pm
- Location: Pripyat
- Been thanked: 1 time
- Contact:
I'm not going to dispute that, it's just that to me the stereotype of a "basic" combustion is a spray n' pray gun with maybe a 3-4 foot barrel. In othe words, what people might build when they first start out.1000 Joules would be a 100g spud moving at 462 FPS. Easily done with a basic combustion with a barrel of 5' or 6'.
Heck, it wouldn't be all that hard to make a fairly basic combustion that would do 2000 Joules (100g at 656 FPS), an 8' barrel should be able to do that (with a properly sized chamber).