RAS is an Open Source (free with available source code) RC Simulator written by Tomasz Dzikuc. The sim main site is available here. Download RAS here
Software features
- Open source
- Written in C++ for Windows using OpenGL
- Aerodynamics is based on the CRRCSim simulator

Installation. RAS is only availble for Windows:
- Download the latest Windows zip package from here. Locate and download the binary version.
- Extract the zip archive to some location, such as c:\. The extracted files will be under c:\Ras_beta.
- To Start the program, open your file explorer and browse to c:\Ras_beta, double click on RAS.exe