A mesh (6) formed of entangled meshes (9) in a cavity (5) enclosed by the outer skin (4) of a blade (3) and (5) provided with parts of lower mechanical resistance (10) called breakable, which have the possibility of breaking when sufficient stresses are applied to it during the dawn service. This arrangement, which concentrates the ruptures at determined locations, will leave the rest of the mesh (6) intact and will therefore not or hardly harm its properties of heat dissipation by conduction or convection or of pressure drop, if for example it is traversed by ventilation air. Figure for the abstract: f ig. 2.
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