1<HTML> 2 3<HEAD> 4 <TITLE> 5 JBM Ballistics - Downloads 6 </TITLE> 7 <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=utf-8"> 8 <LINK REL="stylesheet" HREF="/assets/css/style.css" TYPE="text/css"> 9 <LINK REL="shortcut icon" HREF="/assets/graphics/jbm.ico"> 10 11 <META NAME="DESCRIPTION" 12 CONTENT="Landing page for iPhone apps"> 13 <META NAME="KEYWORDS" 14 CONTENT="iPhone, apps, ballistics, dry fire, IDPA, USPSA"> 15 16</HEAD> 17 18<BODY class="jbm-body-default"> 19 <DIV class="jbm-header-div"> 20 <DIV class="jbm-header-links-div"> 21 <NAV class="jbm-navigation"> 22 <A class="jbm-header-link" HREF="/about.html">About</A> | 23 <A class="jbm-header-link" HREF="/index.html">Apps</A> | 24 <A class="jbm-header-link" HREF="/contact.html">Contact</A> | 25 <A class="jbm-header-link" HREF="/downloads.html">Downloads</A> | 26 <A class="jbm-header-link" HREF="/privacy.html">Privacy Policy</A> 27 </NAV> 28 <DIV CLASS="jbm-copyright-div"> 29 All content and logos © 2010-2026, JBM Ballistics, Build: COMMIT_SHA 30 </DIV> 31 </DIV> 32 </DIV> 33 34 <DIV class="jbm-content-div"> 35 36 <H1> 37 Downloads 38 </H1> 39 40 <P> 41 This page provides some of the downloads from the old website. 42 </P> 43 44 <P> 45 The BASIC programs were given to me by the late Robert L. McCoy and 46 posted here with his knowledge. He worked at the US Army's Ballistics 47 Research Lab for many years, where he wrote these programs as part 48 of his work. I have made some changes to these programs (with Bob's 49 knowledge) only as necessary to fix bugs. There are also some 50 tabulated drag functions some of which Bob sent me and others from 51 the Winchester text (see citation below). 52 </P> 53 54 <UL> 55 <LI><P> 56 <A HREF="/downloads/olin.txt">Drag Functions</A> 57 <BR> 58 Tabulated values of the G1, G5, G6, and GL drag (G) functions, taken from 59 <CITE> 60 Exterior Ballistics of Small Arms Projectiles 61 </CITE>, E. D. Lowry, Research Dept., Winchester-Western Division, 62 Olin Mathieson Chemical Corporation, May 4, 1965. 63 </P> 64 65 <LI><P> 66 More Drag Functions 67 <BR> 68 Tabulated values of CD vs. Mach Number for the 69 <A HREF="/downloads/mcg1.txt">G1</A>, 70 <A HREF="/downloads/mcg2.txt">G2</A>, 71 <A HREF="/downloads/mcg5.txt">G5</A>, 72 <A HREF="/downloads/mcg6.txt">G6</A>, 73 <A HREF="/downloads/mcg7.txt">G7</A>, 74 <A HREF="/downloads/mcg8.txt">G8</A>, 75 <A HREF="/downloads/mcgi.txt">GI</A>, and 76 <A HREF="/downloads/ra4.txt">RA4</A> 77 (G) functions (e.g. CD of the standard G1 bullet, etc). Additionally, 78 I have a list of CD vs. Mach Number for a 9/16" 79 <A HREF="/downloads/mcgs.txt">sphere</A>. I obtained the G functions and 80 sphere from BRL. Note that the mach numbers are not the same for all 81 the tables. The first column is the mach number, the second column 82 is the drag coefficient. I don't remember where I got the RA4 function. 83 </P> 84 85 <LI><P> 86 <A HREF="/downloads/intlift.txt">IntLift</A> 87 <BR> 88 A modified (modified by R. L. McCoy) version of M. A. Morris' 89 RARDLIFT code with corrections for small arms bullets and medium caliber 90 cannon projectiles. Provides interim estimates of lift, overturning 91 moment and yaw drag coefficients. Inputs are very similar to McDrag 92 (above) but it does require the center of gravity location. 93 </P> 94 95 <LI><P> 96 <A HREF="/downloads/intlift2.txt">IntLift2</A> 97 <BR> 98 A modified version of INTLIFT.BAS that has some bug fixes. The 99 original version was written to run on a Tandy1000. There were a 100 few problems with floating point comparisons, etc. I believe that 101 this version fixes those bugs. 102 </P> 103 104 <LI><P> 105 <A HREF="/downloads/mcdrag.txt">McDrag</A> 106 <BR> 107 Calculates bullet CD versus mach number based on bullet dimensions. 108 For more information on this particular program see 109 <CITE> 110 "McDrag" - A Computer Program for Estimating the Drag Coefficients 111 of Projectiles, 112 </CITE> 113 Robert L. McCoy, Technical Report ARBRL-TR-02293, February 1981, 114 [ADA098110]. 115 </P> 116 117 <LI><P> 118 <A HREF="/downloads/mcgyro.txt">McGyro</A> 119 <BR> 120 Stability program. Calculates required twist and bullet stability. 121 This is not Greenhill's formula. 122 </P> 123 124 <LI><P> 125 <A HREF="/downloads/mctraj.txt">McTraj</A> 126 <BR> 127 Trajectory calculation program using a second order Huene predictor 128 corrector method, and a table of CD vs. Mach number to calculate 129 point mass trajectories. 130 </P> 131 132 <LI><P> 133 Modern Exterior Ballistics, Robert L. McCoy 134 <BR> 135 The last updated 136 <A HREF="/downloads/modeb9lc.pdf">unofficial errata</A> 137 of Bob McCoy's book. This was provided to me by the late Don Miller. 138 </P> 139 140 <LI><P> 141 <A HREF="/downloads/lengthlist.html">Bullet Lengths</A> 142 <BR> 143 The last updated copy of the bullet length list. This was a public effort, so I will host this copy 144 but will no longer be making updates to it. 145 </P> 146 147 <LI><P> 148 <A HREF="/downloads/Courtney Miller Stability Formula for Plastic Tipped Bullets Part 1 PS 2012.pdf">Courtney Miller Stability Formula for Plastic Tipped Bullets Part 1 PS 2012</A> 149 <BR> 150 <A HREF="/downloads/Courtney Miller Stability Formula for Plastic Tipped Bullets Part 2 PS 2012.pdf">Courtney Miller Stability Formula for Plastic Tipped Bullets Part 2 PS 2012</A> 151 <BR> 152 Digital versions of the Courtney Miller Stability formula articles, parts one and two, from the now defunct Precision Shooting Magazine. 153 I obtained these files from the editor and have permission to offer them for download. 154 </P></LI> 155 156 </UL> 157 158 </DIV>
159<script src="/assets/js/commit-sha.js"></script>
159 160</BODY> 161
Line numbers count LF bytes from the start of the resource, as the search results do. Vendor segments are library code the classifier recognised; they are stored but not indexed. Bytes are shown as Latin1 characters, one per byte.