Abstract: The device comprises at least two coaxial viscoelastic sleeves, one inside the other, with the interposition of an intermediate ring and between an internal ring and an external ring, the set thus formed being fixed around an internal armature and inside the outer sheath of an external armature, the armatures being connected by connecting members to the two parts etween which the device is mounted. The shear moduli and the geometry of the two elastomer sleeves are chosen so that their stiffness is identical.

Abstract: The thermal protection device comprises, for at least one elastomeric component of a rotor, at least one element which is fitted onto the rotor so as to reduce heat exchange between the elastomeric component and the ambient air. The element may be thermally insulating and may include at least one layer of a thermal insulation material and means for fitting it onto a metal reinforcement of the elastomeric component so as to cover its free surfaces, which are exposed to the ambient air, and/or at least one deflector sheltering, at least partially, a laminated part of the elastomeric component from the relative wind in order to reduce forced convection.

Abstract: Each blade of the rotor has a rigid root oversleeve connected to a torsionable and flexible root strip by two laminated, spherical support half bearings, fixed by their outer frame with double rigid horns the lateral ends of which facing each other on each side of the strip and half bearings are clamped towards each other and against struts so as to allow a significant, calibrated pre-compression of the half bearings. The double horns and/or struts are fixed axially to the oversleeves by fixing elements distinct from the compression means of the double horns on the struts and perpendicular to these compression horns on the struts and perpendicular to these compression elements. One of the struts, possibly in a single piece with one double horn, is also in a single piece with a pitch lever.

Abstract: The device comprises a detachable distance-piece (19') with a pivot (20) retained in a pivoting way in the yoke (7b) of a member (7) connecting a blade (4) to the hub, by one of the two blade pins (15) and a distance-piece yoke (22') in which the blade root (6) is retained pivoting by a fitting pin (18'). The blade (4) is folded by pivoting its root (6) with respect to the distance piece (19') and pivoting the latter with respect to the yoke (7b), with a lateral shift with respect to the conventional folding without a detachable distance-piece (19'), and with a fitting pin (18') which can be inclined with respect to the blade pin (15).