GKS Mig 21 Bis Mod

This mod updates the GKS Mig 21 Bis flight dynamics and engine performance to match real-world specifications. Enhancements include a new engines configuration, updated flight model, new more realistic radar, additional 3D model features such as a working ground power unit, and revised cockpit interactions. Authentic sound samples and a bonus Yugoslav Air Force livery are included. The checklist is expanded with real performance data to assist realistic flight operations.