What does the term "Ng" refer to in engine terminology?

The term "Ng" refers to the speed of the gas generator or the compressor stage of a turbine engine. It is an important parameter because Ng indicates the operational condition of the engine and is critical for monitoring performance and efficiency. In turbine engines, Ng is typically expressed in percentage or RPM and is a key factor in determining the engine's thrust and overall performance during flight operations.

Understanding Ng is crucial for pilots and engine technicians, as it plays a significant role in the engine's operation and helps ensure that the engine is functioning within its designed parameters. Monitoring Ng allows for early detection of potential issues and aids in making informed operational decisions.