#include <Main/util.hxx>
-PitotSystem::PitotSystem ()
+
+PitotSystem::PitotSystem ( SGPropertyNode *node )
+ :
+ name("pitot"),
+ num(0)
+{
+ int i;
+ for ( i = 0; i < node->nChildren(); ++i ) {
+ SGPropertyNode *child = node->getChild(i);
+ string cname = child->getName();
+ string cval = child->getStringValue();
+ if ( cname == "name" ) {
+ name = cval;
+ } else if ( cname == "number" ) {
+ num = child->getIntValue();
+ } else {
+ SG_LOG( SG_SYSTEMS, SG_WARN, "Error in systems config logic" );
+ if ( name.length() ) {
+ SG_LOG( SG_SYSTEMS, SG_WARN, "Section = " << name );
+ }
+ }
+ }
+}
+
+PitotSystem::PitotSystem ( int i )
{
+ num = i;
+ name = "pitot";
}
PitotSystem::~PitotSystem ()
void
PitotSystem::init ()
{
- _serviceable_node = fgGetNode("/systems/pitot[0]/serviceable", true);
+ string branch;
+ branch = "/systems/" + name;
+
+ SGPropertyNode *node = fgGetNode(branch.c_str(), num, true );
+ _serviceable_node = node->getChild("serviceable", 0, true);
_pressure_node = fgGetNode("/environment/pressure-inhg", true);
_density_node = fgGetNode("/environment/density-slugft3", true);
- _velocity_node = fgGetNode("/velocities/uBody-fps", true);
- _total_pressure_node =
- fgGetNode("/systems/pitot[0]/total-pressure-inhg", true);
+ _velocity_node = fgGetNode("/velocities/airspeed-kt", true);
+ _total_pressure_node = node->getChild("total-pressure-inhg", 0, true);
}
void
{
}
+#ifndef INHGTOPSF
+# define INHGTOPSF (2116.217/29.9212)
+#endif
+
+#ifndef PSFTOINHG
+# define PSFTOINHG (1/INHGTOPSF)
+#endif
+
+#ifndef KTTOFPS
+# define KTTOFPS 1.68781
+#endif
+
+
void
PitotSystem::update (double dt)
{
if (_serviceable_node->getBoolValue()) {
// The pitot tube sees the forward
// velocity in the body axis.
- double p = _pressure_node->getDoubleValue();
+ double p = _pressure_node->getDoubleValue() * INHGTOPSF;
double r = _density_node->getDoubleValue();
- double v = _velocity_node->getDoubleValue();
- double q = 0.5 * r * v * v; // dynamic pressure
- _total_pressure_node->setDoubleValue(p + q);
+ double v = _velocity_node->getDoubleValue() * KTTOFPS;
+ double q = 0.5 * r * v * v; // dynamic
+ _total_pressure_node->setDoubleValue((p + q) * PSFTOINHG);
}
}