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Open source
24 alternativesopenMotor
openMotor simulates internal rocket motor ballistics, estimating chamber pressure and thrust from propellant, grain geometry, and nozzle details.
About openMotor
openMotor is an open-source internal ballistics simulator for rocket motor experimenters. It estimates chamber pressure and thrust from propellant properties, grain geometry, and nozzle specifications, using the Fast Marching Method to model grain regression with arbitrary core geometries.
It includes support for BATES, Finocyl, Star and custom DXF geometries, a propellant editor, ENG export and Burnsim import and export, and design save and load with undo and redo. Running from source requires Python 3.10, Qt6 and additional dependencies, plus separate UI and Cython build steps.
Key features
- Models chamber pressure and thrust from propellant, grain, and nozzle inputs
- Supports BATES, Finocyl, Star and other grain geometries
- Loads custom grain geometry from DXF files
- Propellant editor for entering multiple propellant properties
- Displays grain regression in the grain editor
- Exports ENG files and imports and exports Burnsim files
Best for: Rocket motor experimenters who want to estimate internal ballistics from propellant and grain designs.
Good for
- Handles arbitrary core geometries using the Fast Marching Method
- Calculations sourced from Sutton's Rocket Propulsion Elements and Richard Nakka's website
- Distributed as a runnable download and via AUR and Debian apt packages
Watch out for
- Source build requires Python 3.10, Qt6, and several Python dependencies
- UI files and Cython code must be built separately before running
- Missing Python headers or C++ runtime on Windows can cause build or import failures
openMotor at a glance
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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openMotor FAQ
What file formats can openMotor use?
It can load custom grain geometry from DXF files, export ENG files, and import and export Burnsim files.
How do I run openMotor from source code?
Clone the repository, install dependencies from requirements.txt, build the UI with python setup.py build_ui, build extensions with python setup.py build_ext --inplace, then run python main.py.
Where else is openMotor available?
It is available on the AUR as openmotor and on Debian apt as openmotor, in addition to direct downloads.
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