R/C Desk Pilot is a R/C flight simulator for Windows. You can get it at http://rcdeskpilot.com.
It's based on a custom game engine written in C#, based on managed DirectX 9.0c.
You'll need Visual Studio 2015 to compile it. Other than that, the repository should contain all required resources.
You can contact me at info@rcdeskpilot.com.