Patent ID: 8015758

Claim:
A noise insulation device for aircraft having a longitudinal axis with a first opening which is delimited by a series of conducting surfaces, the inner edge of which is directed, in horizontal section, into the interior of the noise insulation device and the outer edge of which is directed toward the side, with a rear, second opening which is situated opposite the first opening and is delimited by walls, characterized in that there are fixed side walls with a roof extending therebetween and at least two movable walls configured to be selectively movable relative to the fixed side walls, the size of the second opening can be changed by movement of at least one of the at least two movable walls, and two of the at least two movable walls are angled to define a rear at least partially enclosed region having a width and which tapers in a direction from the first opening to the second opening, wherein the width is reduced in the direction from the first opening to the second opening and said roof extends rearward from the first opening in the direction of the second opening without extending into said rear at least partially enclosed region.