Eurocopter

Gilles Herpin

Vincent Scala

Violaine Warin

The present invention relates to a method of reducing the vibration of a lift and propulsion rotor () of a rotorcraft (), the rotor having a plurality of airfoil assemblies () that perform rotary movement around a drive axis (AX) of the rotor (), each airfoil assembly () comprising a blade () extending longitudinally from a root () suitable for being fastened to hinge means () of a hub () of said rotor () to a free end (), a first distance (D) extending between said free end () and said hinge means (). In the method, said first distance (D) is caused to vary cyclically so that the projection (TR) of the center of gravity (Cg) of a blade () on a horizontal plane (P) perpendicular to said drive axis (AX) and containing said hinge means () describes a circle.

Method of reducing or even eliminating the vibration of a rotorcraft lift and propulsion rotor, and an airfoil assembly and a rotor implementing said method

The present invention relates to problems of maintenance of elastomeric members. According to the invention, the elastomeric member is provided with at least one elastomeric layerdisposed between two rigid strength members. In addition, the elastomeric member is provided with graduationslocated on its visible surface, presenting an angle of inclination relative to the rigid strength members, thus making it possible to evaluate and monitor propagation of a crackmerely by inspecting it visually.

Elastomeric member provided with monitoring means

The present invention relates to a device for lashing down a rotorcraft wing, said wing being provided with at least first and second adjacent blades P and P', the ends of said blades being provides with respective endpieces. In addition, the device comprises a main cord CP having a first end CPEfastened to first fastener means&#x2032; arranged on a second end CPEsecured to a second blade P&#x2032; and having a second end CPEsecured to a second fastener means Marranged on a first endpiece of the first blade P. The lashing-down endpiece includes first fastener meansfor fastening to a first main cord CP and second fastener means Mfor fastening to a second main cord CP.

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Saint-Chamas, France

Gilles Herpin