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| thespeedycicada |
 Posted: 08/22/2007 23:11 PM Post subject: |
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Lieutenant Colonel
Joined: 12 Aug 2007
Posts: 435
528.45 Spud Bux
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| SpudBlaster15 wrote: | | I have used that method (minus the cinnamon oil), and I find it to be a waste of time, as the resulting gel is identical to the stuff made using my much simpler method. | oh ok,just asking though have you tested them both to compare the density? just wondering.Ive also heard it starts to smell after a while is this true?? |
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| SpudBlaster15 |
| Posted: 08/22/2007 23:26 PM Post subject: |
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Major General
Joined: 18 Oct 2006
Posts: 1533
539.36 Spud Bux
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I didn't measure the density, but the blocks made with both methods were identical in volume, using the same quantity of ingredients.
The gel will grow mold if left to sit for several days. I usually melt it down an re cast it every 2 days or so to prevent this. |
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| beebs111 |
| Posted: 08/24/2007 11:05 AM Post subject: |
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Brigadier General
Joined: 25 Aug 2005
Posts: 812
847.12 Spud Bux
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| i mixed up a batch, and using cold water it was the consistensy of apple sauce. only when i nuked it in the microwave for 30 seconds did it become more liquidy, and now its in the fridge hardening. |
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| FeLeX |
| Posted: 08/27/2007 21:55 PM Post subject: |
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Captain
Joined: 10 Mar 2007
Posts: 304
251.78 Spud Bux
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| I know this sounds dumb but can you measure fps with this? |
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| Pilgrimman |
| Posted: 08/27/2007 22:21 PM Post subject: |
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Captain
Joined: 28 Jun 2007
Posts: 318
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You'd have to know the mass of the projectile, among other things, to find the velocity. (I think)  |
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| spud-tom |
| Posted: 08/27/2007 22:23 PM Post subject: |
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Corporal
Joined: 22 Oct 2006
Posts: 73
78.66 Spud Bux
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| fps, um i would say it is possible, but you would need the exact portion of water and gelatine every time. And you would have to do some experimenting with a chronograph to figure how many fps is per inch of penetration. Good idea though. |
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| jackssmirkingrevenge |
| Posted: 08/27/2007 23:43 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6144
9104.80 Spud Bux
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| FeLeX wrote: | | I know this sounds dumb but can you measure fps with this? |
If you had identical projectiles which didn't deform at all fired into a gelatine block that was always 100% consistent in mixture and at the same temperature every time you might after long calculations get an approximate velocity figure, but honestly, this is so much easier. |
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| FeLeX |
| Posted: 08/28/2007 8:18 AM Post subject: |
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Captain
Joined: 10 Mar 2007
Posts: 304
251.78 Spud Bux
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| So the what can you do with balistics gel then? |
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| jackssmirkingrevenge |
| Posted: 08/28/2007 8:45 AM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6144
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| Quote: | | So the what can you do with balistics gel then? |
Evaluate the hypothetical penetration your projectiles would have through soft living tissue. |
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| FeLeX |
| Posted: 08/28/2007 16:02 PM Post subject: |
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Captain
Joined: 10 Mar 2007
Posts: 304
251.78 Spud Bux
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| So ballistics gel is the closest thing to living tissue? |
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| paaiyan |
| Posted: 08/28/2007 16:08 PM Post subject: |
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Major General
Joined: 27 Dec 2006
Posts: 1996
155.37 Spud Bux
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| FeLeX wrote: | | So ballistics gel is the closest thing to living tissue? |
Ballistics gel cannot accurately represent the effect of a bullet on all tissues and factor in bone. What it can do, is give an approximation of the amount of soft tissue penetration given that the round does not pierce bone. Such as if someone were to shoot you, just an example don't freak out, in the abdomen. The ballistics gel would give a good idea how much a round would penetrate, without actually having to shoot you.
So say you shoot an M82 A-1 packing a .50 BMG at a block of ballistics gel that's two feet long, and you find the round embedded in the wall behind it. Chances are, it's going to go in and out of a person, or animal, quite easily.
Thing is, the skin is tougher than soft internal tissues, so just because you can shoot a BB at a block of gel and it pierces, doesn't mean it would actually penetrate a person's skin. |
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| SpudBlaster15 |
| Posted: 08/28/2007 16:54 PM Post subject: |
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Major General
Joined: 18 Oct 2006
Posts: 1533
539.36 Spud Bux
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| I am still trying to find a material that accurately represents human skin in ballistic applications. |
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| jackssmirkingrevenge |
| Posted: 08/28/2007 17:11 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6144
9104.80 Spud Bux
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| SpudBlaster15 wrote: | | I am still trying to find a material that accurately represents human skin in ballistic applications. |
pig/goat carcasses  why concerned about what your launcher can do to people anyway  I know, I know, because it's cool.
I like the water box'o'truth method - stack up jugs of water and divide penetration by 2. it's not the most accurate or refined in the world but it gives a pretty good idea of performance (as well as a standard that allows you to compare performance with rounds already tested). |
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| joannaardway |
| Posted: 08/29/2007 10:20 AM Post subject: |
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Brigadier General
Joined: 09 Oct 2006
Posts: 961
115.90 Spud Bux
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I spotted the notes about various different TV programmes, and decided to comment on them, even though they are about a week old.
@Mr_Crowley - Most of the time, any air cannon on the TV is vastly inferior to what a good spudder could make. I'm still waiting for the telephone call that tells me they want me as an "expert" on some science show...
@JSR: I did always like Scrapheap challenge... I'm not sure it's "gone", I think the rights were bought out my some satelite or cable station that I don't have.
The last episode I can actually remember watching was where they were doing some tribute to 200 years of the railways, with three teams - one for steam, one for diesel and one for electric.
I can't remember having seen such entertaining TV in a while.
And I agree. Brainiac is appalling... I'm still considering sueing them for mental damages over their appalling ballistics episodes - firstly, they call an onager a trebuchet, then they do a very poor comparison of pneumatics versus combustions.
I hear that there is to be a US version of the show "Life on Mars"... anyone heard anything about that? |
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| Hotwired |
| Posted: 08/29/2007 11:01 AM Post subject: |
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UK Spudgunner
Joined: 13 Oct 2006
Posts: 1551
3182.12 Spud Bux
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| jackssmirkingrevenge wrote: |
I like the water box'o'truth method - stack up jugs of water and divide penetration by 2. it's not the most accurate or refined in the world but it gives a pretty good idea of performance (as well as a standard that allows you to compare performance with rounds already tested). |
I've been wondering about a standardised penetration test for all cannons.
Could be that plastic bottles of water could be a suitable standard... |
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