Awesome shock wave pics: .44 and .30-06

[DFW1911]

All,

Couldn't find these on a search and thought you might find them interesting.

RE: the .44:

This full-scale Schlieren image shows the discharge of a .44 Magnum revolver...

Two spherical shock waves are seen, one centered about the gun’s muzzle (the muzzle blast) and a second centered on the cylinder.

The supersonic bullet is visible at the far left.

And for the '06:

KER-POW! Two different shock wave patterns emerge in this high-speed schlieren photograph of a .30-06-caliber rifle discharge. The wake of the supersonic bullet heads to the left. A much larger, spherical shock wave—a phenomenon recently made visible by advanced imaging methods—balloons from the muzzle's length. Hot gases billow from the muzzle's tip.



I'm a bit jealous since I can't even take a picture with a "fully-automatic" camera!

Take care,
DFW1911

 

[esheato]

Awesome pics, but I wish they were larger.

Ed

 

[Morgan]

Cool. Makes me think of Donnie Darko...

 

[Vegaslaith]

You need one of an AK!

 

[Bartkowski]

Neat pictures...It would be neat to see a gun with a compensator of some sort.

 

[AR2A]

Sweet Pics!

 

[AR2A]

They Look surreal

 

[230RN]

Not sayin' this is the case here, but in general, I am suspicious of any "spectacular" photos nowadays.

Yeah, I know, even Ansel Adams doctored his photos, but that was for art.

Source?

--Embittered Terry

 

[waverace]

Whats interesting is that it clearly shows that the recoil hasnt hit the shooter yet even though the bullet is obviously long gone from the barrel .
+1 on the muzzle brake pic if you can get one.

 

[General Geoff]

I love how you can tell the disparity in projectile velocity by looking at the angle of the shockwave cone that the bullets make. Really cool.

 

[1911Tuner]

Whats interesting is that it clearly shows that the recoil hasnt hit the shooter yet even though the bullet is obviously long gone from the barrel .

And that's what makes me agree with 230RN that maybe it's not all what it seems.

 

[La Pistoletta]

Nice ones, next up Barret .50?

 

[Bruce333]

Source?

Article in American Scientist:

http://www.americanscientist.org/is...ging-of-shock-waves-explosions-and-gunshots/1

 

[ChrisVV]

Oh man! Nice find.

 

[230RN]

Re post 13:

OK on source. TNX. Me happy now.

Doubting Thomas was my favorite Saint.

And yes, recoil does start before the bullet leaves the barrel, although it may not be perceptible in these photographs anyhow.

Recoil starts the instant the bullet starts moving out of the case.

Instead of arguing about it, read Hatcher's Notebook on recoil effects before offering any opinion on when the recoil starts.

Paraquoting Hatcher:

"Manufacturers take this pre-exit recoil into account when they design fixed sight revolvers whether they realize it or not. If you draw a line from the sight and another line from the axis of the barrel, you will see that the sight line points upward from the bore axis to take this pre-exit muzzle flip into account."

This bore axis-sight line divergence is not readily apparent with autos.

If you sit a revolver upside down on its sights, this divergence of the sight line from the bore line becomes readily apparent, especially with heavy-recoil wheelguns.

Anyhow, neat photos. and thanks. I'd like to see some Schlieren photos of the notorious M-44 or an M-38 Mosin-Nagant.

Like, wow, man.

 

[waverace]

Thanx 230rn that explains a few things that I was wondering about

 

[230RN]

It also explains why handgun point of impact is very grip-sensitive, since it will start moving around in the hand before the bullet exits. If it ain't sittin' in the hand the same way for every shot, it will move differently for every shot before the bullet gets out of the barrel.

The Hammerli Olympic pistol, which you put on like a glove, rather than hold like a hammer, helps keep the grip the same for every shot, although it is also designed to reduce wobble. This, even though the recoil of the .22 short standard velocity rounds is very low.

This is such an accurate pistol that I use it for my daily carry gun in a Fahrkelson custom-made IWB holster even though it's a little slow on the draw.

Wouldn't go out without it.

 

[jpsimms]

very cool.
I would like to see one of these pics of a full auto rifle

 

[benEzra]

Whats interesting is that it clearly shows that the recoil hasnt hit the shooter yet even though the bullet is obviously long gone from the barrel .

The rifle is moving at its full recoil velocity, but hasn't moved far yet because it is traveling much slower than the bullet (mph, not thousands of mph).

 

[CountGlockula]

Like the Matrix!

 

[DFW1911]

Here's more info on this type of photography:

CAPTURING GUN SHOTS ON FILM

The muzzle blast and supersonic bullet from firing a Magnum .44 caliber gun is "frozen" in time by a microsecond exposure by the Penn State Gas Dynamics Lab utilizing a technology called Schlieren photography.

Schlieren photography allows the visualization of density changes, and therefore shock waves, in fluid flow. Schlieren techniques have been used for decades in laboratory wind tunnels to visualize supersonic flow about model aircraft.


A simple schlieren system can be built with a single mirror with a long focal length; telescope mirrors can be used for this purpose. The camera and light source are placed close together on either side of the focus, aimed at the mirror. Any straight-filament light bulb will serve; those used in a refrigerator are fine. The target is then placed between the camera and the mirror, typically as close to the mirror as possible to reduce the effective angle between the light source and camera. Light from the filament travels to the mirror where it is collimated (light rays are parallel and thus has a plane wavefront), then across the target and to the camera.

With high-speed cameras, high-magnification lenses and very bright lights, schlieren photography can make the details of airflow visible. This makes it invaluable for studying streamlining and aerodynamics.

Taken from: http://www.lyyn.com/news/newsletter/newsletter2006_02.html

Also, do a search on Schlieren photography for some other pretty cool pics (especially if you use PicLens).

Have fun!

 

[JesseL]

very cool.
I would like to see one of these pics of a full auto rifle

I don't think you'll find a full auto with a high enough cycling rate that you'd ever see the effect of more than a single round at a time in this type of picture.

 

[La Pistoletta]

I don't think you'll find a full auto with a high enough cycling rate that you'd ever see the effect of more than a single round at a time in this type of picture.

What if you modify a MAC-11 .380 to be even faster? Lighter bolt or something.

 

[M60]

I wanna see the shock wave off of this one...





-Mark.

 

[rcmodel]

Awesome pics, but I wish they were larger.

If you click on the thumbnails, they will be larger.

rcmodel