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| CpTn_lAw |
 Posted: 02/15/2010 8:12 AM Post subject: |
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Your friendly scientist
Joined: 11 Sep 2005
Posts: 933
422.24 Spud Bux
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I am pissed !!!! The stungun couldn't take the current of the airsoft battery and broke!!! It melted inside the component that is filled with epoxy. I should have soldered a resistor. So....i'm back with no ignition! Darn it , I had it right at 6x and fired each time! So until i get and ignition back, no hybrid for me  |
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| starman |
| Posted: 02/15/2010 9:33 AM Post subject: |
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Big Daddio
Joined: 11 Dec 2007
Posts: 3076
7546.07 Spud Bux
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Was the voltage of the airsoft battery the same as the stungun's regular battery? The load (stungun in this case) is what determines how much current actually flows, not the current capacity of the battery itself.
Unless of course if you ran up on a stungun design that actually uses the internal resistance of the battery as a feature...built in current limiting device.....  |
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| CpTn_lAw |
| Posted: 02/15/2010 11:37 AM Post subject: |
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Your friendly scientist
Joined: 11 Sep 2005
Posts: 933
422.24 Spud Bux
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It used to run on three 3V lithium batteries, but they were dead two days after I replaced 'em, being 7 euros (roughly 9 dollars) each, I figured i'd better find a way to substancially diminish the economical tsunami in my wallet. So I took my 9,6 volts 3,5 A battery, soldered a battery connector to the stungun (so that I could recharge the batt when it was empty). The problem is that it produces too much curretn compared to the 3 lithium ones.
The stungun would become hot very quickly, and i noticed that the plastic was molten inside.
What brand of stungun is good? because the one I bought was 39 euros, 350,000 V, but here was 60,000 one at 59 euros.... I thought i'd just take the biggest spark. Guess i was wrong.
Now i guess i'll have to buy another one or try the camera flash + ignition coil method. |
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| jrrdw |
| Posted: 02/15/2010 14:25 PM Post subject: |
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Donating Moderator
Joined: 16 Nov 2005
Posts: 5522
9129.22 Spud Bux
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I think any stun gun that takes a straight up 9 volt battery will handle your battery pack. Mine is 100,000 volts, and the battery hangs in there for a bunch of test. I played and played before the akaline (Duracell) went dead.
The camera flash is a pretty good idea because if you get you spark gap just right SNAP they give a hell of a crack. Ultimatespudguns has a ignition module for sale I think it's 39 us dollars thats 60,000 or 80,000 volts I think don't qoute me, look it up if you want to know for sure. |
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| CpTn_lAw |
| Posted: 02/15/2010 14:57 PM Post subject: |
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Your friendly scientist
Joined: 11 Sep 2005
Posts: 933
422.24 Spud Bux
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| Thanks jrrdw , at the moment I just don't have even 39 euros. There is one alternative : a homemade step-up transformer hooked-up to a push switch. I found a cheap way to buy extremely fine copper wire : 3euros per 27 meters! it's like half a millimeter in diameter. I could do like 10,000 turns for the secondary and one for the primary, at 9,6 volts input i'd get approximately 96,000 volts (and since the current is 3,5 amps, it'd be down to 3,5 mA . ) |
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| starman |
| Posted: 02/15/2010 15:45 PM Post subject: |
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Big Daddio
Joined: 11 Dec 2007
Posts: 3076
7546.07 Spud Bux
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| CpTn_lAw |
| Posted: 04/04/2010 7:25 AM Post subject: |
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Your friendly scientist
Joined: 11 Sep 2005
Posts: 933
422.24 Spud Bux
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Hey there! I've changed the ignition to a small piezo-electric igniter from a lighter. It works right at 6-7x, has some little ignition problems at 8x. (my spark gap is 0.3 mm.
Ok here was the setup :
Burst Disc: Polyethylene from a 5liter water jug, small cross cut with exacto knife to allow burst at ~45 bars.
Projectiles:
3 grams ogival lead bullet at 7x from 1 meter 8 mm ID barrel.
10 grams hornady .44 roundball saboted at 7x from 45cm long 16mm barrel.
Here are the pics. (small projectile hit bottom left, bigger one did the big dent upper right. )
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| CpTn_lAw |
| Posted: 04/06/2010 9:46 AM Post subject: |
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Your friendly scientist
Joined: 11 Sep 2005
Posts: 933
422.24 Spud Bux
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New Damage!
Projectile
8mm stainless-steel arrow-head from a 8mm ID , 1 meter long barrel.
mix
8x
Damage
Yes, it went through a fire extinguisher. Needless to say, there were sparks. I am surprised it did go through, I thought it would only go one side. Plus, the angle of the exit hole suggests the arrow head kept going straight after the first side. I don't know the velocity estimation, i'll run it through HGDT and post an edit....
What do you think? |
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| POLAND_SPUD |
| Posted: 04/06/2010 11:14 AM Post subject: |
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Lieutenant General
Joined: 13 Oct 2007
Posts: 4386
11899.05 Spud Bux
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hmm pretty nice but you've wasted a FE  |
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| CpTn_lAw |
| Posted: 04/06/2010 11:36 AM Post subject: |
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Your friendly scientist
Joined: 11 Sep 2005
Posts: 933
422.24 Spud Bux
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I could not do anything with it. It lacks the top part. Plus it's the low pressure water + additives type. I'd have kept it, had it been a CO2 one 
I'm fixing a little ignition problem again... |
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| SpudBlaster15 |
| Posted: 04/06/2010 13:01 PM Post subject: |
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Hybridian
Joined: 18 Oct 2006
Posts: 2372
295.89 Spud Bux
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| Nice damage. Clearly you have this launcher working well, as I know from experience that FE tanks are not easy to cleanly penetrate with small diameter barrels and lightweight projectiles. |
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| CpTn_lAw |
| Posted: 04/06/2010 13:59 PM Post subject: |
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Your friendly scientist
Joined: 11 Sep 2005
Posts: 933
422.24 Spud Bux
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| HGDT gave a 370 m/s estimation...for this projectile. This explains the complete penetration... |
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| SpudBlaster15 |
| Posted: 04/06/2010 14:08 PM Post subject: |
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Hybridian
Joined: 18 Oct 2006
Posts: 2372
295.89 Spud Bux
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Have you measured the mass of that projectile? It would be interesting to see what kind of muzzle energy you're achieving.
Either way, it's likely supersonic, which is impressive for almost any projectile. |
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| CpTn_lAw |
| Posted: 04/06/2010 14:44 PM Post subject: |
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Your friendly scientist
Joined: 11 Sep 2005
Posts: 933
422.24 Spud Bux
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It's about 3 grams! So, I bet 205 joules can be an estimate of the muzzle energy. It really isn't the best, as I use little plastic caps as sabots (they weight 1 gram), they are 16mm wide, and HGDT predicts a velocity above 640 m/s (for almost 205 joules) , I don't know the accuracy about that number, what I do notice though, is that:
1) It is much louder with a cap, than dry firing.
2) It takes a massive hammer impact (i mean really hard) to flatten the cap as much as a shot 7 feet from a steel plate.
3) At point blank, it leaves a bend on the FE on impact. |
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| jackssmirkingrevenge |
| Posted: 04/17/2010 8:23 AM Post subject: |
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aspiring machinist
Joined: 15 Mar 2007
Posts: 18056
32511.66 Spud Bux
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| Bloody good performance! 0.3mm spark gap with a piezo, you say, hmmm... |
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