Blade having an integrated composite spar

A manufacturing process of a blade comprising:

• manufacturing a first fibrous preform of a structure with aerodynamic profile by three-dimensional weaving of threads, said preform comprising two skins delimiting between them an internal space,
• manufacturing a second fibrous preform of a longeron by three-dimensional weaving of threads, said second preform comprising a first and a second portions, the second portion having a thickness substantially equal to that of the skins of the first preform and armour identical to that of said skins,
• forming of the first fibrous preform to produce a preform of structure with aerodynamic profile, said forming comprising the arranging of the second part of the second preform in the internal space between the two skins of the first fibrous preform,
• densification of the first and second preforms by a matrix to produce a blade comprising a structure with aerodynamic profile and a longeron, each having a fibrous reinforcement densified by the matrix.

A manufacturing process of a blade comprising:

• making a first fibrous preform of a structure with aerodynamic profile by three-dimensional weaving of threads, said preform comprising two skins delimiting between them an internal space,
• making a second fibrous preform of a longeron by three-dimensional weaving of threads, said second preform comprising a first and a second portions, the second portion having a thickness substantially equal to that of the skins of the first preform and armour identical to that of said skins,
• densification of the second fibrous preform by a first matrix,
• forming the first fibrous preform to obtain a preform of structure with aerodynamic profile, said forming comprising the arranging of the second part of the second densified preform in the internal space between the two skins of the first fibrous preform, densification of the first preform by a second matrix of a kind different to that of the first matrix to obtain a blade comprising a structure with aerodynamic profile and a longeron, each having a fibrous reinforcement densified by the matrix.