JSBSim is an open-source, multi-platform, non-linear six-degree-of-freedom (6DoF) Flight Dynamics Model (FDM) used to simulate the movement of aerospace vehicles like aircraft and rockets. It is written in C++ and relies on XML-based configuration files to define vehicle characteristics such as aerodynamics, propulsion, and mass balance.
JSBSim --script=my_first_flight.xml
Connect your simulation instance to using the native --native-fdm UDP network broadcast string to visualize your flights in real-time.
<propulsion> <engine file="lycoming_o360"> <location unit="IN"> <x> 30 </x> <y> 0 </y> <z> -20 </z> </location> <orient unit="DEG"> <roll> 0 </roll> <pitch> 0 </pitch> <yaw> 0 </yaw> </orient> <feed>0</feed> </engine> <propeller file="fixed_pitch"> <ixx unit="SLUG*FT2"> 5.0 </ixx> <diameter unit="IN"> 75 </diameter> <numblades>2</numblades> <constspeed>false</constspeed> </propeller> <tank number="0"> <location unit="IN"> <x> 128 </x> <y> 0 </y> <z> 0 </z> </location> <capacity unit="GAL"> 56 </capacity> <contents unit="GAL"> 30 </contents> </tank> </propulsion> jsbsim tutorial
If you need the latest development version or want to customize the build, you can compile JSBSim from source using CMake. The process is straightforward: clone the repository from GitHub, create a build directory, run CMake, and then execute make [12†L27-L33].
The most straightforward method for macOS users is via the Python module. Alternatively, you can build JSBSim from source, which is well-supported on the platform.
Manages simulation time, integration steps, and scheduling. Alternatively, you can build JSBSim from source, which
Use code with caution. Explaining the Math Loop
When you run this command, the console will display text scrolling rapidly. This is the simulation output. The aircraft does not just "fly"—it solves physics equations thousands of times per second, calculating forces, moments, velocities, and accelerations. If the aircraft is poorly configured, it will crash, stall, or behave erratically, which is where your role as a modeler becomes essential.
JSBSim evaluates forces (Lift, Drag, Thrust, Weight, Sideforce) and moments (Pitch, Roll, Yaw) acting on the aircraft at every time step. As an open-source
JSBSim's capabilities are extensive and sophisticated, but they are built on a set of core principles. As an open-source, multi-platform, object-oriented flight dynamics model framework written in C++, it is designed to support the simulation modeling of almost any aerospace craft.
Parasitic Drag aero/qbar-psf metrics/swft 0.025 Induced Drag from Lift aero/qbar-psf metrics/swft aero/alpha-rad 0.05 Use code with caution. 4. Setting Up Sub-Components: Propulsion Modules
JSBSim --script=scripts/c1721.xml