v1.2.1

JSBSim version 1.2.1

Release files

• Windows 64 bits
  • JSBSim-1.2.1-setup.exe (Windows installer compiled with Microsoft Visual Studio Enterprise 2019 (build 16.11.35026.282))
• Ubuntu Focal 20.04 and Jammy 22.04 - amd64
  • *.deb (Debian packages)
• Python wheel packages can be installed from PyPI with the command pip install jsbsim or pip install --upgrade jsbsim when JSBSim is already installed on your system.
• Conda packages are available from conda-forge. To install this package with conda run: conda install -c conda-forge jsbsim

Changelog

User

• Fixed a bug in the computation of orbital parameters where the perigee argument was valid only if the inclination and eccentricity were non-zero (PR #981)
• Restored the ability to use the linearization feature from the console and from XML scripts (PR #991). As a result of this change, the script 737_cruise_steady_turn_simplex.xml no longer fails.
• Fixed an error in the computation of rotation rates in the body frame (aka vPQRdot) (regression test added by PR #1034 and fixed by PR #1036)
• The documentation has been updated regarding the values that the mixture of a piston engine can be set to (PR #1048 and issue #1037).
• Fixed a bug where a telnet connection could not be reopened (PR #1078)
• Added the ability to change the location of thrusters via properties (PR #1073)
• The error management in socket code has been improved to intercept and report more errors. This should help the user finding errors more easily when using this feature (PR #1081)
• Added the ability to modify the property ic/vw-mag-fps i.e. the initial value of the wind velocity magnitude (PR #1093)
• Reduced the console output when debug level is zero (PR #1092)
• The thrust augmentation command is now clamped to the range [0.0 - 1.0] (PR #1090)
• Added properties AGL-ft to display the height above the ground of each contact (PR #1104)
• Clarified the document of <function> to state that it can contain a single <table> element (PR #1131)

Distributed flight dynamics models

• The model of the Short S23 Empire has been updated.
• Fixed the initial conditions of the script ball_orbit.xml so that its orbit gets circular (i.e. its eccentricity is zero). See discussion #985 for more details.
• The model of the Zeppelin NT airship a.k.a ZLT-NT has been updated.
• The model of the Submarine Scout airship has been updated.
• The license of the following files have been changed from GPLv2+ to LGPLv2.1+
  • systems/airship-mooring.xml
  • systems/airship_added_mass.xml
  • systems/hydrodynamic-planing-floats.xml
  • systems/hydrodynamic-planing.xml
  • systems/hydrodynamics.xml
  • systems/visual-reference-point-extensions.xml

Python module

• Improved the caching of property nodes for faster lookups (PR #993)
• The reference counting of property nodes is now shared between the C++ code and the python module. This avoids crashes due to the inadvertent deletion of pointers by the C++ code of pointers that are also used by the Python module. (PR #1000)
• Fixed the documentation of the methods FGPropertyNode.get_double_value and FGPropertyNode.set_double_value (PR #1048 and issue #922).
• Made the Python module compatible with NumPy 2.0 (PR #1107)

Aeromatic++

• Fixed a typo in a message printed in the console by aeromatic++ (PR #1002)
• Fixed the headers so that aeromatic++ can also be compiled with VS2015 (PR #1020)

Developer

• The CMake target libJSBSim now includes the list of the headers it uses for cross reference in other CMake files (PR #1022).
• Some maintenance / minor changes have been done (see PR #1031 and PR #1050 for details).
• Replaced hardcoded buffer lengths by a computation of the length using sizeof(). This avoids potential mismatches in future updates of the files (PR #1035).
• JSBSim is now compiled and tested on MacOS M1 runners (PR #1030)
• libexpat has been updgraded to 2.6.2 (PR #1080)
• The XML element of late bound properties is now released after successful binding for memory saving (PR #1096)