FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups 
 ProfileProfile   PreferencesPreferences   Log in to check your private messagesLog in to check your private messages   Log inLog in 
Forum index » Science and Technology » Physics » Research
Max bullet speed
Post new topic   Reply to topic Page 1 of 1 [4 Posts] View previous topic :: View next topic
Author Message
Ken S. Tucker
science forum Guru


Joined: 30 Apr 2005
Posts: 1230

PostPosted: Sat Jun 24, 2006 9:13 pm    Post subject: Re: Max bullet speed Reply with quote

Dirk Bruere at NeoPax wrote:
Quote:
Uncle Al wrote:
Dirk Bruere at NeoPax wrote:
A future gun physics question.
Simply stated, what is the maximum practical speed of a bullet in air at
(roughly) sea level? Ignore the acceleration mechanism.

I assume that it is the point at which the bullet melts and deforms due
to air friction. If we assume (say) a tungsten projectile and a temp of
3000 degC approx then what would be the corresponding initial velocity?

You may get compressive failure before you get melting. Tungsten
happily burns in air. Tantalum carbide has 500 C better temperature
performance and high strength without sacrificing much density.

The material is really only peripherally relevant to the question. So
we'll assume Tantalum Carbide.

I think the physical limit is explained here...

http://en.wikipedia.org/wiki/Cherenkov-Vavilov_effect

otherwise we'll need a precise definition of the
"bullet" you have in mind.
Regards
KST
Back to top
Dirk Bruere
science forum addict


Joined: 16 Feb 2006
Posts: 62

PostPosted: Fri Jun 23, 2006 3:22 am    Post subject: Re: Max bullet speed Reply with quote

Uncle Al wrote:
Quote:
Dirk Bruere at NeoPax wrote:
A future gun physics question.
Simply stated, what is the maximum practical speed of a bullet in air at
(roughly) sea level? Ignore the acceleration mechanism.

I assume that it is the point at which the bullet melts and deforms due
to air friction. If we assume (say) a tungsten projectile and a temp of
3000 degC approx then what would be the corresponding initial velocity?

You may get compressive failure before you get melting. Tungsten
happily burns in air. Tantalum carbide has 500 C better temperature
performance and high strength without sacrificing much density.

The material is really only peripherally relevant to the question. So
we'll assume Tantalum Carbide.

Quote:
"Blunt body" designs form a thick shockwave ahead of the body that
both deflects the heat and rapidly decelerates over distance. If you
are really zooming along, an ultrahypersonic body passes through its
own mass before flashing into plasma.

I'd forgotten about supercavitation...
Anyway, any ideas on speed?

FFF
Dirk
Back to top
Uncle Al
science forum Guru


Joined: 24 Mar 2005
Posts: 1226

PostPosted: Thu Jun 22, 2006 6:42 am    Post subject: Re: Max bullet speed Reply with quote

Dirk Bruere at NeoPax wrote:
Quote:

A future gun physics question.
Simply stated, what is the maximum practical speed of a bullet in air at
(roughly) sea level? Ignore the acceleration mechanism.

I assume that it is the point at which the bullet melts and deforms due
to air friction. If we assume (say) a tungsten projectile and a temp of
3000 degC approx then what would be the corresponding initial velocity?

You may get compressive failure before you get melting. Tungsten
happily burns in air. Tantalum carbide has 500 C better temperature
performance and high strength without sacrificing much density.

"Blunt body" designs form a thick shockwave ahead of the body that
both deflects the heat and rapidly decelerates over distance. If you
are really zooming along, an ultrahypersonic body passes through its
own mass before flashing into plasma.

--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz3.pdf
Back to top
Dirk Bruere
science forum addict


Joined: 16 Feb 2006
Posts: 62

PostPosted: Mon Jun 19, 2006 10:53 pm    Post subject: Max bullet speed Reply with quote

A future gun physics question.
Simply stated, what is the maximum practical speed of a bullet in air at
(roughly) sea level? Ignore the acceleration mechanism.

I assume that it is the point at which the bullet melts and deforms due
to air friction. If we assume (say) a tungsten projectile and a temp of
3000 degC approx then what would be the corresponding initial velocity?

Dirk
Back to top
Google

Back to top
Display posts from previous:   
Post new topic   Reply to topic Page 1 of 1 [4 Posts] View previous topic :: View next topic
The time now is Wed Oct 18, 2017 4:50 pm | All times are GMT
Forum index » Science and Technology » Physics » Research
Jump to:  

Similar Topics
Topic Author Forum Replies Last Post
No new posts Speed vs velocity. brian a m stuckless Electromagnetics 1 Tue Jul 11, 2006 12:30 pm
No new posts Domino Fall Speed Duram Recreational 4 Wed Jun 28, 2006 12:13 am
No new posts Speed of Arrow after 1 second AA Physics 4 Tue Jun 27, 2006 12:35 pm
No new posts Einstein, mind's voyage, speed of light and time glbrad01 Relativity 48 Sat Jun 24, 2006 10:30 am
No new posts "Where Is The Kinetic Energy of a Bullet Stored?" Yad Relativity 18 Sun Jun 18, 2006 1:17 pm

Copyright © 2004-2005 DeniX Solutions SRL
Other DeniX Solutions sites: Electronics forum |  Medicine forum |  Unix/Linux blog |  Unix/Linux documentation |  Unix/Linux forums  |  send newsletters
 


Powered by phpBB © 2001, 2005 phpBB Group
[ Time: 0.0205s ][ Queries: 20 (0.0040s) ][ GZIP on - Debug on ]