Glossary
What are transonic airfoils, and what is the active clearance control? Check out our technical dictionary and find out more about engine technology terms – from active clearance control to velocity triangle.
Phosphate treatment
Plastic media blasting
Powder metal (PM) components
Pollutants
Precipitation hardening
Pressure ratio
Principle of energy transfer
Propfan
Propulsion efficiency
Propulsion efficiency
The external efficiency - also called propulsion efficiency - is a measure of the quality of an engine. It depends on the outlet velocity/flight velocity ratio, i.e. the smaller this ratio the higher is the propulsion efficiency.
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