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RPA v.4.0.3

10-Jul-2025, 11:08 GMT

RPA v.4.0.3 is released.

RPA v.4 Released

The development team is pleased to announce the release of our product RPA v.4

Major changes in this release:

Enhanced Solver Stability and Functionality.
Significant improvements in solver stability through self-adjusted algorithms and diagnostics.

Introduction of new features such as support for thermal propulsion.

Note: The cycle analysis module has been removed in RPA v.4.0. However, it will return in a future release with redesigned models, an updated UI, and full integration with the scripting utility.
Extended JavaScript utility functionality.
This release features an extended scripting utility with a comprehensive JavaScript API, enabling users to code and execute complex problem solvers for any functional area supported by RPA, surpassing the capabilities of the User Interface.

The package includes detailed API documentation and multiple examples for various use cases, from simple combustion problems to complex performance analyses involving thrust chamber design and thermal analysis.
Redesigned User Interface.
The user interface has been updated to group related parameters and results on corresponding screens, making navigation more intuitive and user-friendly.
Technology Stack Upgrade.
The technology stack has been upgraded.

The UI is implemented using Qt 6.x, an upgrade from Qt 4.8.

The code has been rewritten and rebuilt using C++17, compared to C++03/11 in the previous version.
New Configuration File Format.
Configuration files in RPA v.4 now use the JSON format, making custom format files from previous versions incompatible with RPA v.4.

A command-line scripting utility script is provided to facilitate the migration of existing configuration files to the new JSON format.

Rocket Propulsion Analysis

RPA is a multi-platform analysis tool for the conceptual and preliminary design of chemical rocket engines, offering capabilities such as:

Engine performance analysis
Thrust chamber sizing
Nozzle wall contour optimization
Thrust chamber heat transfer and cooling analysis
Scripting utility for development of custom solutions

More features >> Get free trial copy >>

Combustion Analysis

RPA-C is a general-purpose code for combustion analysis of propellants and pyrotechnic mixtures. One potential application is using combustion analysis to design airbag inflators and micro gas generators for the automotive industry.

The software is capable of:

Solving combustion problems for a wide range of initial mixtures, including those producing condensed products
Estimating Heat of Explosion (HEX) using both the exact method and the inert diluent (Ar) method
Obtaining thermodynamic properties of reacting mixtures using a robust, proven, and industry-accepted Gibbs free energy minimization approach
Maintaining an extendable database of ingredients and reaction products
Importing chemical species from NASA CEA and PROPEP formats
Editing chemical species to modify existing ones or add custom ingredients
Providing a scripting utility to access RPA-C functionality from third-party tools and custom scripts (e.g., Matlab, Scilab, or Octave)
Offering a Scilab native plugin for the development of custom solutions

More features >> Get free trial copy >>

Custom Development

We build custom cross-platform native, web and mobile solutions that keep you ahead of the competition.

Key technical expertise:

Numerical analysis and simulations for combustion and rocket propulsion applications
Cross-platform development of engineering and scientific software
Development in modern C++

Learn more >>