//
// This file is in the Public Domain and comes with no warranty.
-#include "pitot.hxx"
+#include <simgear/constants.h>
+
#include <Main/fg_props.hxx>
#include <Main/util.hxx>
+#include "pitot.hxx"
+
-PitotSystem::PitotSystem ()
+PitotSystem::PitotSystem ( SGPropertyNode *node )
+ :
+ _name(node->getStringValue("name", "pitot")),
+ _num(node->getIntValue("number", 0))
{
}
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);
+ _slip_angle = fgGetNode("/orientation/side-slip-rad", 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
+
+
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() * SG_KT_TO_FPS;
+ v *= cos(_slip_angle->getDoubleValue());
+ if (v < 0.0)
+ v = 0.0;
+ double q = 0.5 * r * v * v; // dynamic
+ _total_pressure_node->setDoubleValue((p + q) * PSFTOINHG);
}
}