Path: utzoo!mnetor!tmsoft!torsqnt!jarvis.csri.toronto.edu!rutgers!att!cbnews!military
From: russ@bbx.UUCP (Russ Kepler)
Newsgroups: sci.military
Subject: Re: M16 Ammo
Message-ID: <11529@cbnews.ATT.COM>
Date: 18 Nov 89 06:37:03 GMT
Sender: military@cbnews.ATT.COM
Organization: BASIS International, Albuquerque NM
Lines: 22
Approved: military@att.att.com



From: russ@bbx.UUCP (Russ Kepler)
In article <11498@cbnews.ATT.COM> you write:
>                                                               Think about it,
>1 Revolution every 8 inches, traveling about 3300 fps, is 297,000 RPM.
>You physics students, how much rotational energy does the jacket of this
>bullet have to contain, considering it's a 55 grain slug? (side note: how
>many grains are in an ounce/gram?).

At 7000 grains to the lb thats about 15.43 grains to the gram.  The
55 grain (1to8 twist usually shoots 62 grain BTW) bullet becomes 
3.56 grams with a rotation rate of 297K RPM.  A .223 cal slug is a
nominal 5.65mm, half of which is 2.83MM spinning around and around
tracing about 5280 m/s.  I'll take someone with a bit more memory
of physics and/or engineering to figure out the actual stress of a
cylindrical lump of relatively pure lead inside a sleeve of copper.
-- 
Russ Kepler -  Basis International
SNAILMAIL:  5901 Jefferson NE, Albuquerque, NM 87109
UUCP:       {backboneishsite}!unmvax!bbx!russ
PHONE:      505-345-5232