AP_Math: add macro for m/s to knots convertion

6 years ago · 6e95a144ef
1 changed files with 2 additions and 0 deletions
--- a/libraries/AP_Math/definitions.h
+++ b/libraries/AP_Math/definitions.h
@ -73,6 +73,8 @@ static const double WGS84_E = (sqrt(2 * WGS84_F - WGS84_F * WGS84_F));
				@@ -73,6 +73,8 @@ static const double WGS84_E = (sqrt(2 * WGS84_F - WGS84_F * WGS84_F));

 #define C_TO_KELVIN 273.15f

+#define M_PER_SEC_TO_KNOTS 1.94384449f
+
 // Gas Constant is from Aerodynamics for Engineering Students, Third Edition, E.L.Houghton and N.B.Carruthers
 #define ISA_GAS_CONSTANT 287.26f
 #define ISA_LAPSE_RATE 0.0065f