Definition of the engine nacelle type.
The engine nacelle is currently located together with the engine. It gives a simple description of the outer shell of the engine. All values are defined according to the base area, center point of the fan(i.e. negative values can occur in the definition) In most cases there will be a bypass engine. For non-bypass or mixed engines ignore the bypass nozzle. For further information on the geometric setup, please refer to the picture below.