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Re: How thin is to thin? PALUNC #311129 01/27/13 07:38 PM
Joined: Feb 2004 Posts: 13,880 Likes: 16 Torrance, CA Chuck H Sidelock
Chuck H Sidelock Joined: Feb 2004 Posts: 13,880 Likes: 16 Torrance, CA	What are the specific physics that support a pressure pulse of approximately 50% of max chamber pressure in a localized area of the size seen here?

Re: How thin is to thin? PALUNC #311141 01/27/13 09:54 PM
Joined: Dec 2001 Posts: 12,743 Lynchburg TN 2-piper Sidelock
2-piper Sidelock Joined: Dec 2001 Posts: 12,743 Lynchburg TN	Chuck; I never studied physics so I guess I can't specifically answer your question. We are all though I think familiar with obstruction bulges & bursts. The physics would be essentially the same with the choke serving as the obstruction. Sir Gerald Burrard devoted a great deal of space to this subject. A through perusal of it is most enlightening. Miller/TN I Didn't Say Everything I Said, Yogi Berra

Re: How thin is to thin? PALUNC #311153 01/28/13 12:20 AM
Joined: Feb 2004 Posts: 13,880 Likes: 16 Torrance, CA Chuck H Sidelock
Chuck H Sidelock Joined: Feb 2004 Posts: 13,880 Likes: 16 Torrance, CA	I was surfing thru some gas dynamics blogs and didnt run across anything applicable. The stuff I stumbled on didn't specifically identify localized pressure spikes. Nor did it discuss any fractional slowing of a piston in a cylinder. However, I did read about a shock wave in front of a piston in a cylinder and some stuff about amplification when the cylinder area reduces.

Re: How thin is to thin? Hoof #311240 01/28/13 03:48 PM
Joined: Jul 2005 Posts: 7,065 Amarillo, Texas AmarilloMike Sidelock
AmarilloMike Sidelock Joined: Jul 2005 Posts: 7,065 Amarillo, Texas	Originally Posted By: Hoof So how thin were the walls at the burst? 5/1000th or 50/1000ths? If we are talking the last third of the muzzle end of the barrel 21/1000th is plenty for me. If we are talking a 1/2" from the muzzle end of the chamber it is not. Does the story that goes with that picture give any theories of the failure? Last edited by AmarilloMike; 01/28/13 03:50 PM. I am glad to be here.

Re: How thin is to thin? PALUNC #311266 01/28/13 05:35 PM
Joined: Feb 2006 Posts: 3,738 Likes: 56 Eastern Pa David Williamson Sidelock
David Williamson Sidelock Joined: Feb 2006 Posts: 3,738 Likes: 56 Eastern Pa	An obstruction. David

Re: How thin is to thin? PALUNC #311269 01/28/13 05:51 PM
Joined: Jul 2011 Posts: 839 Bilious Bob Sidelock
Bilious Bob Sidelock Joined: Jul 2011 Posts: 839	If it's an LC Smith, my theory stops right there.

Re: How thin is to thin? AmarilloMike #311276 01/28/13 06:20 PM
Joined: Feb 2009 Posts: 7,465 Likes: 212 craigd Sidelock
craigd Sidelock Joined: Feb 2009 Posts: 7,465 Likes: 212	Originally Posted By: AmarilloMike .....Does the story that goes with that picture give any theories of the failure? There's some explanation in Doc Drew's link.

Re: How thin is to thin? craigd #311281 01/28/13 07:00 PM
Joined: Jul 2005 Posts: 7,065 Amarillo, Texas AmarilloMike Sidelock
AmarilloMike Sidelock Joined: Jul 2005 Posts: 7,065 Amarillo, Texas	Originally Posted By: craigd Originally Posted By: AmarilloMike .....Does the story that goes with that picture give any theories of the failure? There's some explanation in Doc Drew's link. Thanks Craig, I missed that. This is what Drew's caption to that picture said: "These images are entertaining only after knowing that injuries sustained were not life threatening. Please be careful out there! 1918 12g L.C. Smith Field Ruptured barrel with first shell of Bismuth Magnum Game Load 2 3/4" 1 3/8 oz. shot" I am glad to be here.

Re: How thin is to thin? PALUNC #311282 01/28/13 07:02 PM
Joined: Jan 2006 Posts: 9,433 Likes: 316 AZ but dreaming of KS Drew Hause Sidelock
Drew Hause Sidelock Joined: Jan 2006 Posts: 9,433 Likes: 316 AZ but dreaming of KS	Mike: I'm sorry but I don't have any more information. As I recall no attempt was made to measure wall thickness. https://sites.google.com/a/damascusknowledge.com/www/home

Re: How thin is to thin? PALUNC #311287 01/28/13 07:06 PM
Joined: Jul 2005 Posts: 7,065 Amarillo, Texas AmarilloMike Sidelock
AmarilloMike Sidelock Joined: Jul 2005 Posts: 7,065 Amarillo, Texas	Thanks Drew. I would be interested in sending my wall thickness gauge to the gun's owner and ask him to measure the wall thickness at the burst. Of course in that configuration a micorometer would work too! Last edited by AmarilloMike; 01/28/13 07:07 PM. I am glad to be here.

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