Posted: Sat Aug 11, 2007 11:06 pm
400 page book, maybe I made a typo. It's both, hopefully my parents won't notice the holes. 
Yep, typo.
Yep, typo.
Page 2 of 2
Posted: Sun Aug 12, 2007 12:15 am
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Posted: Sun Aug 12, 2007 12:18 am
The book was chucked, but I would gladly blast another one! 
A battery will go through almost anything that isn't too thick. Either that, or become a weird little starfish thing like in the pictures. 
A battery will go through almost anything that isn't too thick. Either that, or become a weird little starfish thing like in the pictures. Posted: Sun Aug 12, 2007 2:58 am
How about 1/16" iron plate? or smaller?
Posted: Sun Aug 12, 2007 11:51 am
Not sure abou that. I can try with some 1/32" stainless steel. That's the only sheet metal I have (it's for ninja stars ).
).Posted: Tue Aug 14, 2007 3:45 pm
Just got a 20 foot barrel for this thing! I should be having some supersonic fun pretty soon. 
The cement was cured, so I went out and shot it. I forgot to mention that last night I too out the "spark plug" and tinkered around with it until the spark gap was less than 1/16." It can now ignite 6x mixtures, and I'll try 7x in a little while. The first shot I did with the new 20 footer was a 6x shot (the first 6x mix). It managed to put a battery through a piece of 1" plywood and a 2 x 4 stacked against each other, then went another 30 feet and went through my fence, andother 1" of wood. The battery was not found (obviously, because you can't see the projectile, even with only a 3x mixture).
The second shot, the only other one in those 5 minutes, was also at a 6x mixture. This time, it was a ball bearing, to see if I could tell if it was supersonic or not. I'm pretty sure it was, because I was using 3 layers of soda can as a burst disc. I'm also pretty sure DDT occured. I saw the board 40 feet in front of the barrel get kicked up, then heard a CRACK that sounded like shooting a 9mm blank next to your ear a split second later.
The cement was cured, so I went out and shot it. I forgot to mention that last night I too out the "spark plug" and tinkered around with it until the spark gap was less than 1/16." It can now ignite 6x mixtures, and I'll try 7x in a little while. The first shot I did with the new 20 footer was a 6x shot (the first 6x mix). It managed to put a battery through a piece of 1" plywood and a 2 x 4 stacked against each other, then went another 30 feet and went through my fence, andother 1" of wood. The battery was not found (obviously, because you can't see the projectile, even with only a 3x mixture).
The second shot, the only other one in those 5 minutes, was also at a 6x mixture. This time, it was a ball bearing, to see if I could tell if it was supersonic or not. I'm pretty sure it was, because I was using 3 layers of soda can as a burst disc. I'm also pretty sure DDT occured. I saw the board 40 feet in front of the barrel get kicked up, then heard a CRACK that sounded like shooting a 9mm blank next to your ear a split second later.
Posted: Wed Dec 05, 2007 7:23 am
the 2" steel of the chamber resisted a DDT? i at least got a BBQ igniter, and i'm planing of buying a 1/2" union and i'd like to know if 2" steel is good or if i should stay with one inch...? please help me here! you seem to be fairly nautorious here.
Posted: Wed Dec 05, 2007 9:20 am
I really don't think there is any way to tell for certain. I'm just assuming noname guessed about that part.
After reading some pdfs found randomly on the interblag, I'm pretty sure it's next to impossible to create a DDT in such a small vessel; there's just not enough run-up.
With very high pressures and a high-energy igniter you could, but based on what I've read propane is a bad fuel use if you want to create a DDT.
2" steel has been tested up to 11x, remember? (Though 11x was only done twice, which is far less than I would have wanted, had time allowed)
There was no sign of any structural damage or wear, and I'm fairly sure it would have stayed that way even if I had done 50 tests that day.
Now that I think about it, I really should have bought a 2" union and tried setting some records when I had that hybrid together. Oh well...
After reading some pdfs found randomly on the interblag, I'm pretty sure it's next to impossible to create a DDT in such a small vessel; there's just not enough run-up.
With very high pressures and a high-energy igniter you could, but based on what I've read propane is a bad fuel use if you want to create a DDT.
2" steel has been tested up to 11x, remember? (Though 11x was only done twice, which is far less than I would have wanted, had time allowed)
There was no sign of any structural damage or wear, and I'm fairly sure it would have stayed that way even if I had done 50 tests that day.
Now that I think about it, I really should have bought a 2" union and tried setting some records when I had that hybrid together. Oh well...
Posted: Wed Dec 05, 2007 12:49 pm
ok thanks _Fnord !!
btw : 400 posts today...amen. after more than 2 years on this forum and 5 years of building spudguns.
btw : 400 posts today...amen. after more than 2 years on this forum and 5 years of building spudguns.
Posted: Sat Mar 01, 2008 1:59 pm
with the conversion exuasion i used your gun should be shooting your projectile at about 988 mph.
Posted: Sat Mar 01, 2008 2:38 pm
When you post velocities, please post them in Feet per second (fps) it makes it easier to compare to other guns...
Posted: Sun Mar 02, 2008 10:21 am
998 miles per hour = 1 463.73333 feet per second
Posted: Sun Oct 05, 2008 9:49 pm
I got this thing set up and shooting again; I'd forgotten how insane it is. I also figured out yesterday that my mom's camera (which I've been using for years) actually does take videos. 
I should be able to get some for you guys. Anything in particular you'd like to see blasted to bits?
I should be able to get some for you guys. Anything in particular you'd like to see blasted to bits?Posted: Sun Oct 05, 2008 11:27 pm
Anything will do...just do it!!noname wrote:I got this thing set up and shooting again; I'd forgotten how insane it is. I also figured out yesterday that my mom's camera (which I've been using for years) actually does take videos.