Jet engine with a radially variable wall

A jet engine having a flow duct that is arranged in an engine nacelle and is delimited radially on the inside by a central body and radially on the outside by an outer nozzle wall, the free cross section of the flow duct being variable by an elastically embodied, radially variable wall of at least one of these components, and the radially variable wall at least regionally having an at least approximately wavelike structure with convex regions and concave regions that are arranged alternately with one another in the circumferential direction, the convex regions and the concave regions being formed in a sinusoidal manner in a radial section plane, and being connected to at least one adjusting device having an adjusting unit, wherein the variable wall of one of these components is variable in a radial direction at two defined, axially spaced apart wall cross sections, at least one of which defines an axial wall end of the radially variable wall, a connecting structure for connecting the at least one adjusting unit to the variable wall being provided, and the connecting structure having a multiplicity of bar elements that are arranged in a circumferentially distributed manner and are each connected firmly to a-one of the concave regions of the wall.