PropertyManager->Tie( property_name, &J );
snprintf(property_name, 80, "propulsion/engine[%d]/blade-angle", EngineNum);
PropertyManager->Tie( property_name, &Pitch );
PropertyManager->Tie( property_name, &J );
snprintf(property_name, 80, "propulsion/engine[%d]/blade-angle", EngineNum);
PropertyManager->Tie( property_name, &Pitch );