Path: spln!rex!extra.newsguy.com!lotsanews.com!news.maxwell.syr.edu!news-out.visi.com!hermes.visi.com!gemini.tycho.net.POSTED!not-for-mail Approved: sci-military-moderated@retro.com Return-Path: news@google.com Delivery-Date: Thu Mar 28 20:27:47 2002 Delivery-Date: Thu, 28 Mar 2002 20:27:46 -0800 for <sci-military-moderated@retro.com>; Thu, 28 Mar 2002 20:27:45 -0800 (PST) for <sci-military-moderated@moderators.isc.org>; Thu, 28 Mar 2002 20:09:24 -0800 (PST) for <sci-military-moderated@moderators.isc.org>; Thu, 28 Mar 2002 20:09:24 -0800 for <sci-military-moderated@moderators.isc.org>; Thu, 28 Mar 2002 20:09:24 -0800 for sci-military-moderated@moderators.isc.org; Thu, 28 Mar 2002 20:09:24 -0800 To: sci-military-moderated@moderators.isc.org From: Tony.Williams@quarry.nildram.co.uk (Tony Williams) Newsgroups: sci.military.moderated Subject: Re: RHA penetration of 25mm M919 from M242 Bushmaster? Date: 28 Mar 2002 20:09:23 -0800 Organization: http://groups.google.com/ Message-ID: <e64faab.0203282009.5aba72f7@posting.google.com> References: <a7vvq90l9o@enews1.newsguy.com> X-NNTP-Posting-Host: 195.149.37.246 Content-type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Complaints-To: groups-abuse@google.com X-NNTP-Posting-Date: 29 Mar 2002 04:09:24 GMT Content-Length: 1598 Lines: 32 NNTP-Posting-Host: 900776be.newsreader.tycho.net X-Trace: 1017427224 gemini.tycho.net 79560 205.179.181.194 X-Complaints-To: abuse@tycho.net Xref: spln sci.military.moderated:43790 TTK Ciar <ttk@NOSPAM_remove_all_after_org.ciar.org.aol.com> wrote in message news:<a7vvq90l9o@enews1.newsguy.com>... > Hello, > I was wondering if anyone knew what the penetration capability was, > in RHA equivalence, of the 25mm M919 APFSDS when fired from the M242 > Bushmaster chain gun. The only relevant data I have is for the Oerlikon Contraves APFSDS round, which penetrates 37mm/1,000m/60 degrees (armour type unspecified). > Also, as an aside, does using RHA equivalence work very well? That > is to say, if a given KE penetrator is known to penetrate "X" mm of > RHA, and a given composite armor is considered to equate "Y" mm of > RHA, then will all penetrators for X > Y penetrate that armor? Or do > different kinds of KE penetrators have potentially radically nonlinear > penetration characteristics (more than 10% margin of error? 20%?) > depending on the kind of composite armor? Do you never really know > until you can test the munition against that armor, or does the RHA > equivalence arithmetic come pretty close? I believe that any "RHA equivalence" figure is likely to be an average, and that different types of ammunition will perform differently depending on the composition of the armour, but I have no data to support that. Tony Williams Author: "Rapid Fire: The development of automatic cannon, heavy machine guns and their ammunition for armies, navies and air forces" Details on my military gun and ammunition website: http://www.quarry.nildram.co.uk Military gun and ammunition discussion forum: http://forums.delphiforums.com/autogun/messages/