SpudFiles

Thanks Jack. That coin is roughly 0.4mm thicker than the one I used, which probably made a noticeable difference (both are steel though). Roughly how much energy were those two airsoft rounds carrying?

I may try this again sometime, if I can get around to making more capillary tubes. There was a noticeable band on my coin where the center was beginning to separate. Perhaps tweaking for efficiency, using a denser round, and overcharging the cap slightly would push it over the edge...

Anyone with a hybrid care to try?

@SB15: I'll believe in your friend's airsoft cannon when I see it

An attempt with a near-molten coin would be highly entertaining, but for obvious reasons not deserving of the prize.

DYI wrote:Roughly how much energy were those two airsoft rounds carrying?

No idea with this particular launcher with airsoft BBs, I'll do some chrony testing over the weekend.

I could try to shoot a 5 euro cent with the hybrid. I have HGDT running now, and, If i use a little teflon to round an airsoft BB in the 8mm barrel, a 0.24 gram BB will go 720 m/s (77joules) at 8x...I'mm gonna try that

CpTn_lAw wrote:a 0.24 gram BB will go 720 m/s

Show off

Editing the video

Edit :


[youtube][/youtube]



Image shack doesn't seem to want me to upload the hgdt picsture, i will keep on trying until it works.

Interesting. I did not expect the coin to crack like that at all. However, there's a good chance that the penny you used was zinc, which makes comparison with my steel dime rather difficult. I do have some U.S. pennies laying around, maybe I'll try with one of those. Unfortunately, I don't have any heavier airsoft rounds than .12g.

Thanks CpTn_lAw. This shows that "normal" launchers can definitely have some effect.

Fork in hell, certainly worth 5 euro cents

I'm sorry i didn't have any .12g BB's, and I did anither test in the afternoon, this time non saboted out of the 30 cm long barrel at a 2 euro-cents, which is (a good) 30% thicker. The result is not the same, it bent instead of cracking, and the bend is lighter. The speed was according to HGDT in the region of 460 m/s.
Here is a freeze frame of a shot without a barrel, but with a 1/2" ==> 1/4" reducuer. (and finally the HGDT capture)

CpTn_lAw wrote:(and finally the HGDT capture)

I'm using two separate computers! I was waiting for an answer like that XD

CpTn_lAw wrote:I was waiting for an answer like that XD

Ah, but it takes a special kind of annoying git to bother looking up how "print screen" is written in French

By the way:

Roughly how much energy were those two airsoft rounds carrying?

0.25 gram: 785 feet per second, 5.3 ft/lbs

0.12 gram: 918 feet per second, 3.5 ft/lbs

Doesn't compare to a hybrid but not bad for a mini pneumatic with a 7 inch barrel

Edit: tried again with a (virtually worthless ) 1 rouble coin and a 0.25 gram, visible dimple this time, and while there was no penetration, the clear acrylic shattering behind the coin will attest to the energy transfer

[youtube][/youtube]

Well, after being bogged down with school for the past few months, I finally got to try it again. Still a 0.12g 6mm BB and 1.22mm thick steel Canadian dime, but a little more kinetic energy this time than before.

LINKY

The challenge is still open. More shots at steel coins, and perhaps a glimpse of SB15's elusive airsoft cannon would be appreciated.

I'll make an airsoft barrel for the ETC when machining is finished. If around 5km/s and twice the energy of a .44 magnum doesn't do it, nothing will.

thats some impressive penetration, but was it the bb or the hot gasses that did the majority of the damage?

inonickname wrote:I'll make an airsoft barrel for the ETC when machining is finished.

Electrothermal Chemical?


Nice penetration, DYI, time for me to order some derin.