_pressure_inhg = _props->getNode("environment/pressure-inhg", true);
_density_slugft = _props->getNode("environment/density-slugft3", true);
_data_logging = _props->getNode("/sim/temp/fdm-data-logging", true);
_pressure_inhg = _props->getNode("environment/pressure-inhg", true);
_density_slugft = _props->getNode("environment/density-slugft3", true);
_data_logging = _props->getNode("/sim/temp/fdm-data-logging", true);