Weird bullet action

WyMark · June 27, 2018, 08:03 AM

I don't want this to be a drive-by, but at the same time I think you really need to see what happens when this guy fires a round into a frozen lake. It's not at all what I would have expected to see. Not something I think I'd want to try, my luck the ice would fracture and dump me in.

Guy shoots into ice.

TXAZ · June 27, 2018, 08:28 AM

Not weird but expected. The bullet left the barrel spinning at OM 100,000 rpm.

Mythbusters did a session on this several years ago, but took more shots to show the effect than this guy.
MythBusters spinning bullet=> 2:00 minutes

Not quite up to Darwin Award honorable mention status, this guy wasn't very smart in his safety practices.

**Aguila Blanca** · June 27, 2018, 10:40 AM

I can't view the link. They want me to subscribe, or disable my ad blocker. Neither is going to happen.

RickB · June 27, 2018, 05:57 PM

Quote:

Not weird but expected. The bullet left the barrel spinning at OM 100,000 rpm

But, since a bullet typically is actually in the air for a fraction of a second . . .
I remember an episode of CSI, in which they recreated a shooting with an animation of a bullet spinning like a buzz saw as it enters the body, but if you figure a rifling twist of 1:12, the bullet might not make even one revolution as it passes completely through a body.

WyMark · June 27, 2018, 07:52 PM

I saw the Myth Busters episode with the spinning bullet. What was unique about this one was how it spun point down like a top and traveled over the ice. I thought it was pretty cool. ymmv

briandg · June 30, 2018, 04:38 PM

Oh, my, that was unexpected. the thing was rapidly spinning and it was trapped on a nearly friction free surface. It makes a lot of sense, but it's still unexpected.

At a velocity of 1,000 fps, with rotation being approx 1:12, you would have 1,000 revolutions per second when the thing stopped moving forward, and ice didn't allow friction to shut it down.

gwpercle · June 30, 2018, 06:04 PM

I don't believe it. But I don't believe in a lot of things, so what do I know .

briandg · June 30, 2018, 10:08 PM

I believe it but it would require that the thing lose all forward momentum while still retaining all of its rotational momentum. In other words it would have to stop, and keep spinning. If you wreck your car, your motor will keep running, and a bullet sitting on a nearly frictionless surface, for example, wet ice, will continue to rotate at the same speed as it was when it stopped and it would gradually slow down as the minimal amount of friction that wet ice provides dragged it down to a stop.

June 27, 2018, 08:03 AM	#1
WyMark Senior Member Join Date: January 10, 2011 Location: Wyoming Posts: 647	Weird bullet action I don't want this to be a drive-by, but at the same time I think you really need to see what happens when this guy fires a round into a frozen lake. It's not at all what I would have expected to see. Not something I think I'd want to try, my luck the ice would fracture and dump me in. Guy shoots into ice.

June 27, 2018, 08:28 AM	#2
TXAZ Senior Member Join Date: September 5, 2010 Location: McMurdo Sound Texas Posts: 4,322	Not weird but expected. The bullet left the barrel spinning at OM 100,000 rpm. Mythbusters did a session on this several years ago, but took more shots to show the effect than this guy. MythBusters spinning bullet=> 2:00 minutes Not quite up to Darwin Award honorable mention status, this guy wasn't very smart in his safety practices. __________________ Cave illos in guns et backhoes

June 30, 2018, 04:38 PM	#6
briandg Senior Member Join Date: May 4, 2010 Posts: 5,468	Oh, my, that was unexpected. the thing was rapidly spinning and it was trapped on a nearly friction free surface. It makes a lot of sense, but it's still unexpected. At a velocity of 1,000 fps, with rotation being approx 1:12, you would have 1,000 revolutions per second when the thing stopped moving forward, and ice didn't allow friction to shut it down. __________________ None.

June 30, 2018, 06:04 PM	#7
gwpercle Senior Member Join Date: November 30, 2012 Location: Baton Rouge, Louisiana Posts: 1,752	I don't believe it. But I don't believe in a lot of things, so what do I know . Last edited by gwpercle; June 30, 2018 at 06:11 PM.

June 30, 2018, 10:08 PM	#8
briandg Senior Member Join Date: May 4, 2010 Posts: 5,468	I believe it but it would require that the thing lose all forward momentum while still retaining all of its rotational momentum. In other words it would have to stop, and keep spinning. If you wreck your car, your motor will keep running, and a bullet sitting on a nearly frictionless surface, for example, wet ice, will continue to rotate at the same speed as it was when it stopped and it would gradually slow down as the minimal amount of friction that wet ice provides dragged it down to a stop. __________________ None.

June 27, 2018, 10:40 AM	#3
Aguila Blanca Staff Join Date: September 25, 2008 Location: CONUS Posts: 18,460	I can't view the link. They want me to subscribe, or disable my ad blocker. Neither is going to happen.

June 27, 2018, 07:52 PM	#5
WyMark Senior Member Join Date: January 10, 2011 Location: Wyoming Posts: 647	I saw the Myth Busters episode with the spinning bullet. What was unique about this one was how it spun point down like a top and traveled over the ice. I thought it was pretty cool. ymmv