The Firing Line Forums

Go Back   The Firing Line Forums > The Conference Center > General Discussion Forum

Reply
 
Thread Tools
Old July 24, 2013, 06:45 PM   #1
SC4006
Senior Member
 
Join Date: June 27, 2012
Location: New Hampshire
Posts: 327
Guns fired underwater... at 27000 Frames Per Second!

The first video is slow mo footage of a semi automatic pistol, as well as a revolver being fired underwater. You can clearly see the areas where gas escapes the firearms when being fired, most notably you can see the gasses coming from the cylinder gap on the revolver. The video is done by two guys on youtube called The Slow Mo Guys.

Here's the first video: Video #1

Also, in collaboration with these guys, a guy with the youtube channel called SmarterEveryDay, fired an AK47 underwater.

Here is the AK47 Underwater video: Video #2

Also, if you are into seeing cool stuff happen at extremely slow speeds, or into science at all, definitely take a look at their channels!
__________________
Army National Guard Infantry Nov. 2013 - Pesent

They say 5 out of 4 people are bad at math, but what do I know?
SC4006 is offline  
Old July 24, 2013, 07:06 PM   #2
Brian Pfleuger
Staff
 
Join Date: June 25, 2008
Location: Central, Southern NY, USA
Posts: 18,743
That is very cool.

The difference in the cavitation trail behind the revolver and semi bullets is fascinating as is watching the hot gases collapse in the water instead of continuing to expand and rise as you might expect from a normal air bubble.
__________________
Still happily answering to the call-sign Peetza.
---
The problem, as you so eloquently put it, is choice.
-The Architect
-----
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.
Brian Pfleuger is offline  
Old July 24, 2013, 08:41 PM   #3
Vanya
Staff
 
Join Date: July 7, 2008
Location: Upper midwest
Posts: 3,877
Yeah... I came across those yesterday. Very cool.

I liked the SmarterEveryDay guy... he actually explained what was happening. The Slow Mo Guys are having fun, but it would be nice if they were a bit longer on info... for example, the bullet in the first (I think) video appears to tumble, but the others don't. One would like to know why...
__________________
"Once the writer in every individual comes to life (and that time is not far off), we are in for an age of universal deafness and lack of understanding."
(Milan Kundera, Book of Laughter and Forgetting, 1980)
Vanya is offline  
Old July 24, 2013, 08:59 PM   #4
Shane Tuttle
Staff
 
Join Date: November 28, 2005
Location: Blue Grass, IA
Posts: 8,556
I like how it shows the shockwave returning back through the bullet's path several times. What's odd is both firearms have a continuing concussion at a downward path.

You think the hollowpoint bullet had anything to do with the difference in the cavitation trail?
__________________
If it were up to me, the word "got" would be deleted from the English language.

Posting and YOU: http://www.albinoblacksheep.com/flash/posting
Shane Tuttle is offline  
Old July 24, 2013, 09:02 PM   #5
SC4006
Senior Member
 
Join Date: June 27, 2012
Location: New Hampshire
Posts: 327
Quote:
The Slow Mo Guys are having fun, but it would be nice if they were a bit longer on info...
Yeah I feel the same way, they don't go nearly as much into the scientific aspect of whats happening as the SmarterEveryDay guy (Destin), they're a little more on the silly side most of the time. Still pretty cool though.
__________________
Army National Guard Infantry Nov. 2013 - Pesent

They say 5 out of 4 people are bad at math, but what do I know?
SC4006 is offline  
Old July 24, 2013, 10:00 PM   #6
LewSchiller
Senior Member
 
Join Date: February 21, 2013
Location: Metro Denver Colorado
Posts: 227
I like Slow Mo from 6:01 on in that it really shows the loss of pressure at the cylinder gap. If I've properly described it.
__________________
"When the Going gets Weird the Weird Turn Pro"
Hunter S. Thompson
LewSchiller is offline  
Old July 25, 2013, 12:00 AM   #7
Tom Servo
Staff
 
Join Date: September 27, 2008
Location: Foothills of the Appalachians
Posts: 10,302
Neat video. What's interesting is that the Ruger actually goes into slide lock. I'd always wondered if the differences in pressure and resistance would cause the slide to cycle more slowly.
__________________
In the depth of winter I finally learned that there was in me an invincible summer.
--Albert Camus
Tom Servo is offline  
Old July 25, 2013, 09:34 AM   #8
Brian Pfleuger
Staff
 
Join Date: June 25, 2008
Location: Central, Southern NY, USA
Posts: 18,743
Quote:
Originally Posted by Shane Tuttle
You think the hollowpoint bullet had anything to do with the difference in the cavitation trail?
I don't know, it could be. My first guess is that the massive gun loss around the cylinder gap is leaving less gas to be dragged along behind the bullet but I really don't know. It could be velocity differences too.
__________________
Still happily answering to the call-sign Peetza.
---
The problem, as you so eloquently put it, is choice.
-The Architect
-----
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.
Brian Pfleuger is offline  
Old July 25, 2013, 10:57 AM   #9
SHE3PDOG
Senior Member
 
Join Date: January 27, 2013
Posts: 981
This was pretty neat to watch. I wonder if those bubbles that were seen under water ccould also effect a bullet's path out in the open air.
__________________
Semper Fi

Marine, NRA member, SAF Defender's Club member, and constitutionally protected keeper and bearer of firearms
SHE3PDOG is offline  
Old July 25, 2013, 11:19 AM   #10
Brian Pfleuger
Staff
 
Join Date: June 25, 2008
Location: Central, Southern NY, USA
Posts: 18,743
Quote:
I wonder if those bubbles that were seen under water could also effect a bullet's path out in the open air.
Notice that, especially with the rifle, the muzzle blast gets out ahead of the bullet by a good distance. I'm guessing 6 inches or so before the bullet catches up and appears through the bubble. That blast definitely effects the bullets flight. It's one of the reasons (the major reason) why boat-tail bullets are slightly less accurate at close range (under ~300 yards) than are flat base bullets. The boat-tail's length gives the muzzle blast slightly more time to act on the bullet and it takes a few hundred yards for the bullets inherently better ballistic properties to make up for that difference.
__________________
Still happily answering to the call-sign Peetza.
---
The problem, as you so eloquently put it, is choice.
-The Architect
-----
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.
Brian Pfleuger is offline  
Old July 25, 2013, 01:55 PM   #11
alex0535
Senior Member
 
Join Date: November 4, 2012
Location: Georgia
Posts: 781
I thought the fluctuations of escaping gasses from the muzzle of the AK-47 were pretty awesome.
alex0535 is offline  
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 10:52 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2014 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent: thefiringline.com
Contact Us
Page generated in 0.08874 seconds with 9 queries