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(YouTube)   War on Christmas tree made up out of det cord in slow motion   (youtube.com) divider line 20
    More: Cool, Christmas trees, slow motion  
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2812 clicks; posted to Video » on 18 Dec 2013 at 12:06 PM (29 weeks ago)   |  Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»



20 Comments   (+0 »)
   
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2013-12-18 11:22:05 AM
In the slow-mo part you can see the shock wave.  Neat.
 
2013-12-18 11:38:25 AM

dittybopper: In the slow-mo part you can see the shock wave.  Neat.


That's got to be a crazy high frame rate.  Doesn't det cord burn at some ridiculous speed?  I flew next to a guy that made the stuff once, and I seem to recall him saying it was something like 29,000 feet per second.
 
2013-12-18 11:47:27 AM

Marcus Aurelius: dittybopper: In the slow-mo part you can see the shock wave.  Neat.

That's got to be a crazy high frame rate.  Doesn't det cord burn at some ridiculous speed?  I flew next to a guy that made the stuff once, and I seem to recall him saying it was something like 29,000 feet per second.


He's got a good camera.  See the clip at the beginning of him firing the .50BMG in slow mo, and you can see the actual bullet?

That bullet is travelling at approximately 2,800 feet per second, the reverse of which is that it travels 1 foot in 1/2,800th of a second.  If the frame rate was 2,800 frames per second, we'd see the bullet moving a foot at a time.

The frame rate is much faster, though, because you can see it travelling smoothly which means it's got to be a frame rate of something like every half or quarter inch, so your looking at a frame rate of 67,000 frames per second up to 134,000 frames per second, as an approximate guess.
 
2013-12-18 12:08:23 PM
Slow mow starts at 2.50min mark. Fark apparently eats the URL with "start at a specific time" info.
 
2013-12-18 12:20:16 PM
I have to wonder if the guy has ever watched himself talking in his videos, the repeated hand motions, like he's trying, but not quite succeeding in handing you something, are as uncomfortable and noticeable as if his every other word was "um".
 
2013-12-18 12:25:48 PM

hinten: Slow mow starts at 2.50min mark. Fark apparently eats the URL with "start at a specific time" info.


It would probably work if you manually edited the URL first, e.g. http://www.youtube.com/watch?&v=m8CBXHzLssc&t=170 (changing "#t=" to "&t=").
 
2013-12-18 12:46:01 PM

timujin: I have to wonder if the guy has ever watched himself talking in his videos, the repeated hand motions, like he's trying, but not quite succeeding in handing you something, are as uncomfortable and noticeable as if his every other word was "um".


Dude makes high-speed films of cool shiat.  Who cares?
 
2013-12-18 12:54:35 PM

dittybopper: timujin: I have to wonder if the guy has ever watched himself talking in his videos, the repeated hand motions, like he's trying, but not quite succeeding in handing you something, are as uncomfortable and noticeable as if his every other word was "um".

Dude makes high-speed films of cool shiat.  Who cares?


What a stupid question.  I do, obviously, that's why I wrote what I did.  I would also assume he does, otherwise the video would be just the high-speed stuff.  When you produce things, you should take pride in all aspects of the work.
 
2013-12-18 01:19:02 PM

Marcus Aurelius: dittybopper: In the slow-mo part you can see the shock wave.  Neat.

That's got to be a crazy high frame rate.  Doesn't det cord burn at some ridiculous speed?  I flew next to a guy that made the stuff once, and I seem to recall him saying it was something like 29,000 feet per second.


According to my FM-5-34, military det-cord burns at 27,000 fps. If you strung it from Los Angeles to New York City, it would take eight minutes to burn from one city to the other. Also, we once tried to cut down a 5-inch oak with five wraps of det cord. It blew the bark off, but didn't cut it down. Very disappointed.
 
2013-12-18 01:47:47 PM
meh, I thought he was going to blow up an actual christmas tree.  Now that would have been worth watching.
 
2013-12-18 01:48:58 PM
This was kind of boring...

...Up until the slow-mo, and then it became one of the coolest things that I have EVER seen in my life. WOW.
 
2013-12-18 01:53:17 PM

UNAUTHORIZED FINGER: According to my FM-5-34, military det-cord burns at 27,000 fps.


yup
 c.e.1371 ftw,
 
2013-12-18 02:19:41 PM
Looks more like a det cord fetivus pole.
 
2013-12-18 02:28:12 PM

Marcus Aurelius: dittybopper: In the slow-mo part you can see the shock wave.  Neat.

That's got to be a crazy high frame rate.  Doesn't det cord burn at some ridiculous speed?  I flew next to a guy that made the stuff once, and I seem to recall him saying it was something like 29,000 feet per second.


at 02:41 it goes off in real time. it's a split-second.
 
2013-12-18 02:43:03 PM

UNAUTHORIZED FINGER: Marcus Aurelius: dittybopper: In the slow-mo part you can see the shock wave.  Neat.

That's got to be a crazy high frame rate.  Doesn't det cord burn at some ridiculous speed?  I flew next to a guy that made the stuff once, and I seem to recall him saying it was something like 29,000 feet per second.

According to my FM-5-34, military det-cord burns at 27,000 fps. If you strung it from Los Angeles to New York City, it would take eight minutes to burn from one city to the other. Also, we once tried to cut down a 5-inch oak with five wraps of det cord. It blew the bark off, but didn't cut it down. Very disappointed.


Duh.

You have to configure your explosives properly in order to cut a post/tree/support/whatever.
 
2013-12-18 02:57:10 PM

dittybopper: UNAUTHORIZED FINGER: Marcus Aurelius: dittybopper: In the slow-mo part you can see the shock wave.  Neat.

That's got to be a crazy high frame rate.  Doesn't det cord burn at some ridiculous speed?  I flew next to a guy that made the stuff once, and I seem to recall him saying it was something like 29,000 feet per second.

According to my FM-5-34, military det-cord burns at 27,000 fps. If you strung it from Los Angeles to New York City, it would take eight minutes to burn from one city to the other. Also, we once tried to cut down a 5-inch oak with five wraps of det cord. It blew the bark off, but didn't cut it down. Very disappointed.

Duh.

You have to configure your explosives properly in order to cut a post/tree/support/whatever.


No shiat? I was instructing a class at Camp Ripley Minnesota in -7 degree weather. We did not pack the charge, just wrapped it tightly. Then we took bets. I won $30, by betting it would not cut the tree down. Had it been a 5-inch pine, I'd have bet the other way.
 
2013-12-18 10:27:19 PM

Marcus Aurelius: dittybopper: In the slow-mo part you can see the shock wave.  Neat.

That's got to be a crazy high frame rate.  Doesn't det cord burn at some ridiculous speed?  I flew next to a guy that made the stuff once, and I seem to recall him saying it was something like 29,000 feet per second.


Given the rate that the shock wave is traveling away from the detonation (speed of sound) versus the rate of the detonation, it's at least several multiples of the speed of sound.
 
2013-12-19 12:07:37 AM
I've watched a few of his video's and he has a camera setup for 90,000 frames per second and another that is rated at 129million frames per second.  A lot of fun to watch if you're into watching fast things go slow!
 
2013-12-19 11:40:09 AM

nin3064: I've watched a few of his video's and he has a camera setup for 90,000 frames per second and another that is rated at 129million frames per second.  A lot of fun to watch if you're into watching fast things go slow!


I are smart:  90,000 fps is right smack dab between my guess:

That bullet is travelling at approximately 2,800 feet per second, the reverse of which is that it travels 1 foot in 1/2,800th of a second.  If the frame rate was 2,800 frames per second, we'd see the bullet moving a foot at a time.
The frame rate is much faster, though, because you can see it travelling smoothly which means it's got to be a frame rate of something like every half or quarter inch, so your looking at a frame rate of 67,000 frames per second up to 134,000 frames per second, as an approximate guess.
 
2013-12-19 12:17:41 PM
Oh Tannen Bomb, oh tannen bomb.....
 
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