Rotorcraft skid undercarriage and a rotorcraft including such an undercarriage

A rotorcraft (21) comprising a fuselage (22) and a skid undercarriage (20) having skids (24, 25) interconnected by a first cross-member (26) and a second cross-member (27), first and second connection means serving to connect the first cross-member to the fuselage, and a single central third connection means (28) arranged to transmit forces from the second cross-member to the fuselage and vice versa, wherein:

• said first connection means (30, 31) comprise two first parts designed to be placed astride the first cross-member (26) and to bear thereagainst, said first connection means alone being active for transmitting forces from the first cross-member (26) to the fuselage so long as the deformation of the first cross-member (26) remains less than a determined level of deformation in rolling or in vertical sinking;
• and
• said second connection means (29, 32) comprise two second parts designed to be placed astride the first cross-member (26) and to bear thereagainst when said determined level of deformation of the cross-member is reached or exceeded, said second connection means extending outside the first parts on both sides, said second connection means becoming active only when the deformation of the first cross-member (26) reaches or exceeds said determined level of deformation.