KJ-66 micro turbojet engine

This is a beautifully detailed cutaway CAD rendering of a KJ-66 micro turbojet engine.

The KJ-66 holds a milestone position in the history of micro turbojets, especially within the realms of aeromodelling and micro-UAVs. Jointly designed by aviation enthusiasts Kurt Schreckling and Jesus Artes (the name comes from their initials), its open-source blueprints, classic structure, and ease of manufacturing made it the “godfather” and foundational design for countless commercial model aircraft turbine engines worldwide.

Based on the cutaway view you provided, we can clearly break down its core structure and working principles from left to right (following the airflow from intake to exhaust):