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.

Electrochemical metal removal (ECM) Eddy-current inspection Electro-discharge machining (EDM) Efficiency Electroless nickel plating Electropolishing Engine 3E Engine price Enthalpy reaction rate Etching (etch inspection) Etch inspection Exhaust jet

Efficiency

The efficiency, a measure for the quality of a machine, indicates the ratio between losses and effective work during conversion of the thermal energy supplied. A difference is made between the internal (thermal) efficiency and the external efficiency which is also known as the propulsion efficiency.