1 /* 2 * CRRCsim - the Charles River Radio Control Club Flight Simulator Project 3 * 4 * Copyright (C) 1993 Bruce Jackson (original author) 5 * Copyright (C) 2000 Jan Edward Kansky 6 * Copyright (C) 2005, 2006, 2008 Jens Wilhelm Wulf 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 10 * as published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, 20 * Boston, MA 02111-1307, USA. 21 * 22 */ 23 24 /** 25 * \file ls_constants.h 26 * 27 * LaRCSim constants definition header file 28 * 29 * REFERENCES: 30 * 31 * [ 7] Anon: "Aeronautical Vest Pocket Handbook, 17th edition", 32 * Pratt & Whitney Aircraft Group, Dec. 1977 33 */ 34 35 #ifndef _LS_CONSTANTS 36 #define _LS_CONSTANTS 37 38 #ifndef M_PI 39 # define M_PI 3.14159265358979323846 40 #endif 41 42 /* Define constants (note: many factors will need to change for other 43 systems of measure) */ 44 45 /* miscellaneous units conversions (ref [7]) */ 46 #define DEG_TO_RAD (M_PI/180.0) 47 #define RAD_TO_DEG (180.0/M_PI) 48 #define K_TO_R (1.8) 49 #define R_TO_K (0.55555556) 50 #define NSM_TO_PSF (0.02088547) 51 #define PSF_TO_NSM (47.8801826) 52 #define KCM_TO_SCF (0.00194106) 53 #define SCF_TO_KCM (515.183616) 54 #define LBF_TO_N (4.44822) 55 #define N_TO_LBF (1.0/LBF_TO_N) 56 #define NM_TO_LBFFT (1.0/1.355818) 57 #define FT_TO_M (0.3048) 58 #define M_TO_FT (1.0/FT_TO_M) 59 #define SLUG_TO_KG (14.5939041995) 60 #define KG_TO_SLUG (1.0/SLUG_TO_KG) 61 #define KG_M_M_TO_SLUG_FT_FT (1.0/(SLUG_TO_KG*FT_TO_M*FT_TO_M)) 62 63 64 #endif /* _LS_CONSTANTS_H */ 65 66 67 /*------------------------- end of ls_constants.h -------------------------*/ 68