X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FSystems%2Fstatic.cxx;h=f8dc2add63d97a452610a1ab241029d0789018f6;hb=9c63b7713307eb4db9f6df7959fe83977f561c42;hp=f8510fe61a6619aafe4be934c4e9ff023bf52226;hpb=8770e61d1b1be465ee81d35f00ada11acf6773b3;p=flightgear.git

diff --git a/src/Systems/static.cxx b/src/Systems/static.cxx
index f8510fe61..f8dc2add6 100644
--- a/src/Systems/static.cxx
+++ b/src/Systems/static.cxx
@@ -15,6 +15,9 @@
 #include <Main/fg_props.hxx>
 #include <Main/util.hxx>
 #include <simgear/constants.h>
+#include <simgear/math/SGMisc.hxx>
+#include <simgear/math/SGLimits.hxx>
+#include <simgear/math/SGMathFwd.hxx>
 #include <simgear/sg_inlines.h>
 
 
@@ -22,7 +25,7 @@ StaticSystem::StaticSystem ( SGPropertyNode *node )
     :
     _name(node->getStringValue("name", "static")),
     _num(node->getIntValue("number", 0)),
-    _tau(node->getDoubleValue("tau", 1)),
+    _tau(SGMiscd::max(.0,node->getDoubleValue("tau", 1))),
     _error_factor(node->getDoubleValue("error-factor", 0)),
     _type(node->getIntValue("type", 0))
 {
@@ -76,7 +79,7 @@ StaticSystem::update (double dt)
         double beta;
         double alpha;
         double mach;
-        double trat = _tau ? dt/_tau : 100;
+        double trat = _tau ? dt/_tau : SGLimitsd::max();
 
         double proj_factor = 0;
         double pt;
@@ -93,14 +96,16 @@ StaticSystem::update (double dt)
             proj_factor = sqrt( 1.0 - cos(beta)*cos(beta) * cos(alpha)*cos(alpha) );
         }
 
-        if ( (_type ==1) or  (_type == 2) ) {
+        if ( (_type ==1) || (_type == 2) ) {
             mach = _mach_node->getDoubleValue();
             pt = p_new * pow(1 + 0.2 * mach*mach*proj_factor*proj_factor, 3.5 );    //total pressure perpendicular to static port (=perpendicular to body x-axis)
             qc_part = (pt - p_new) * _error_factor ;                            //part of impact pressure to be added to static pressure (due to sideslip)
             p_new = p_new + qc_part;
         }
 
-        _pressure_out_node->setDoubleValue(fgGetLowPass(p, p_new, trat));           //setting new pressure in static system
+        _pressure_out_node->setDoubleValue(
+            _tau > .0 ? fgGetLowPass(p, p_new, trat) : p_new
+        );           //setting new pressure in static system
 
     }
 }