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Post by ironhold on Dec 21, 2017 15:20:36 GMT
So...
I guess Ooblek in and of itself is something that kids can do at home?
Also, due to how much running about I had to do yesterday, I kept missing the final few minutes of the episode. Have to see if I can't catch a re-run.
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Post by the light works on Dec 24, 2017 23:56:39 GMT
at least you got to see it at all. for some reason, it didn't record on my DVR. sometimes I really wish I could afford a third DVR, so I could have my own recording queue.
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Post by ponytail61 on Dec 25, 2017 6:09:57 GMT
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Post by the light works on Dec 25, 2017 11:33:42 GMT
with luck, the DVR will know I haven't seen it, yet, and get it on its own. otherwise, hopefully I will remember to set the timer for it next week. |
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Post by the light works on Jan 4, 2018 4:15:18 GMT
finally getting to see it.
myth #1: can you pick up a corpse in a firefight and use it as a shield in a gunfight.
myth #2: can cornstarch mud (oobleck, AKA non newtonian fluid) be used as a bomb shield.
some awesome small scale testing, and some don't-miss science in the penetration test for #1. and yes, I'm going to invoke the "you want to see this" clause.
full scale:
myth one: nice engineering, clear results.
myth two: way cool new visual, cool new explosive, and a very clear result.
worth the wait.
however, I would like to see a revisit on the oobleck and see if they can improve their previous result.
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Post by silverdragon on Jan 4, 2018 8:21:07 GMT
Myth one, done and dusted, even if the enemy is using fragmentation shells, you dont know what they are using, so better than nothing, but a steel table an inch think is better?., (Or?. Is it?...)
Myth two, well who would have called that result?.
I was thinking, along with others, maybe a lesser pressure wave...
All in all, perfect results on both myths, and I like the idea of the buried pressure sensors.
Previous pressure sensors have proven to be one use and a little vague on results, this reusable system looks easy to install once they work out a quicker way to wire the pipes and reusable many many times?.
Or perhaps just leave the pipes wire up eh?..
However.
Going overboard and super-sizing the myth... say you had an office block you wanted protecting against random acts of violence.
Add to that the idea of maybe a vehicle attack trying to crash through the wall?.
May I ask, if you had a wall that had an oobleck "shield" tank over it, attached to it, no gap between, would that spread the impact more over the whole wall rather than a localised blast?.
They state a 10lbs pressure difference can blow a wall, but if that pressure difference over a MUCH larger wall?.
And with the "tank", they need to talk to the show "Tanked" that can build them a bigger tank that wont bow out under weight.
Perspex tank walls glued together are the way to go with that, and the thinker the perspex the higher the walls...
Also, for consideration, the perimeter wall of say a small army barracks, at this time, is made up of bags of sand?.
Would a central core of ooobleck {sp?} inbetween a sand bag double skin wall fare better than just a sand-bag wall?.
Supersize that, would a wall covered with Bed-Liner, that we already know is super-strong, protected by an oobleck tank, work?.
The idea of this is spread the initial blast radius out over a bigger wall.
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Post by silverdragon on Jan 4, 2018 8:25:17 GMT
BTW Wiring up a pipe, I have found a length of string tied to the end of a wire sucks though a pipe with a vacuum cleaner and is a hell of an easy way to wire through a pipe.
This is an old trick I learnt back last century, so I cant claim to be the origin of that one, its used to wire up lengths of pipe that have to be weather protected inside steel or plastic sealed pipe runs.
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Post by the light works on Jan 4, 2018 14:37:13 GMT
Myth one, done and dusted, even if the enemy is using fragmentation shells, you dont know what they are using, so better than nothing, but a steel table an inch think is better?., (Or?. Is it?...) Myth two, well who would have called that result?. I was thinking, along with others, maybe a lesser pressure wave... All in all, perfect results on both myths, and I like the idea of the buried pressure sensors. Previous pressure sensors have proven to be one use and a little vague on results, this reusable system looks easy to install once they work out a quicker way to wire the pipes and reusable many many times?. Or perhaps just leave the pipes wire up eh?.. However. Going overboard and super-sizing the myth... say you had an office block you wanted protecting against random acts of violence. Add to that the idea of maybe a vehicle attack trying to crash through the wall?. May I ask, if you had a wall that had an oobleck "shield" tank over it, attached to it, no gap between, would that spread the impact more over the whole wall rather than a localised blast?. They state a 10lbs pressure difference can blow a wall, but if that pressure difference over a MUCH larger wall?. And with the "tank", they need to talk to the show "Tanked" that can build them a bigger tank that wont bow out under weight. Perspex tank walls glued together are the way to go with that, and the thinker the perspex the higher the walls... Also, for consideration, the perimeter wall of say a small army barracks, at this time, is made up of bags of sand?. Would a central core of ooobleck {sp?} inbetween a sand bag double skin wall fare better than just a sand-bag wall?. Supersize that, would a wall covered with Bed-Liner, that we already know is super-strong, protected by an oobleck tank, work?. The idea of this is spread the initial blast radius out over a bigger wall. like I said, I'd like to see them come up with a better idea. since you spilled the result, perhaps use the oobleck to protect your shockwave absorbing wall from shrapnel. |
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Post by the light works on Jan 4, 2018 14:37:48 GMT
BTW Wiring up a pipe, I have found a length of string tied to the end of a wire sucks though a pipe with a vacuum cleaner and is a hell of an easy way to wire through a pipe. This is an old trick I learnt back last century, so I cant claim to be the origin of that one, its used to wire up lengths of pipe that have to be weather protected inside steel or plastic sealed pipe runs. you know what also works well? a fish tape. |
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Post by silverdragon on Jan 5, 2018 9:59:34 GMT
BTW Wiring up a pipe, I have found a length of string tied to the end of a wire sucks though a pipe with a vacuum cleaner and is a hell of an easy way to wire through a pipe. This is an old trick I learnt back last century, so I cant claim to be the origin of that one, its used to wire up lengths of pipe that have to be weather protected inside steel or plastic sealed pipe runs. you know what also works well? a fish tape. You mean Draw wire, or "Bent coat-hanger", its good, agreed. Its not called a Fist tape this side of the pond?.. well,, not that I have heard, but Duck-google-fu gave me what you were meaning. However, on complicated pipes, not that good at doing 90degree bends, whereas, a bit of string can be sucked through the whole length of a pipe no matter what shape its bent into?. I have used the string on a 12volt "bell wire" link on metal pipe with two junction box 90degree turns where the pipe was no bigger than a domestic water pipe, OK, so, I had to undo the junction boxes to assist the wire turning, but the string went all the way through on the first attempt. The junction boxes were waterproof seals. [Anyone else thinking "oink oink throw the man a fish"?.. I was?..  ]I have used draw wires many times, but they dont like to be bent that much. A wire Coat-hanger has always been part of my toolkit... |
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Post by the light works on Jan 5, 2018 15:00:19 GMT
you know what also works well? a fish tape. You mean Draw wire, or "Bent coat-hanger", its good, agreed. Its not called a Fist tape this side of the pond?.. well,, not that I have heard, but Duck-google-fu gave me what you were meaning. However, on complicated pipes, not that good at doing 90degree bends, whereas, a bit of string can be sucked through the whole length of a pipe no matter what shape its bent into?. I have used the string on a 12volt "bell wire" link on metal pipe with two junction box 90degree turns where the pipe was no bigger than a domestic water pipe, OK, so, I had to undo the junction boxes to assist the wire turning, but the string went all the way through on the first attempt. The junction boxes were waterproof seals. [Anyone else thinking "oink oink throw the man a fish"?.. I was?.. ]I have used draw wires many times, but they dont like to be bent that much. A wire Coat-hanger has always been part of my toolkit... if the tape won't feed, the wire won't pull well. sure, I've used the vacuum on long pulls, but I'm not going to go to the trouble of pulling out the vacuum and pull string and finding a plastic bag for a 20 foot stick of straight pipe. |
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