초록 ▼

The method comprises the following steps: producing a preform of the blade comprising a blade root section for connection to a hub and an aerodynamically profiled main blade section, the blade root section of the preform including at least one cylindrical portion for guidance in terms of incidence;

The method comprises the following steps: producing a preform of the blade comprising a blade root section for connection to a hub and an aerodynamically profiled main blade section, the blade root section of the preform including at least one cylindrical portion for guidance in terms of incidence; arranging a respective peripheral metal ring around each cylindrical portion for guidance in terms of incidence of the preform; arranging the preform provided with each peripheral metal ring in an injection mould; injecting a thermosetting liquid resin into the mould; and heating the mould to make the thermosetting resin set.

대표청구항 ▼

[ What is claimed is:] [1.] Method for manufacturing a variable-pitch composite blade for a helicopter rotor, comprising the steps of:producing a preform of the blade comprising a blade root section for connection to a hub and an aerodynamically profiled main blade section, wherein the blade root co

[ What is claimed is:] [1.] Method for manufacturing a variable-pitch composite blade for a helicopter rotor, comprising the steps of:producing a preform of the blade comprising a blade root section for connection to a hub and an aerodynamically profiled main blade section, wherein the blade root consists essentially of fibers, the blade root section of the preform including at least two cylindrical portions for guidance in terms of incidence, the said two cylindrical portions being spaced apart from each other;arranging, as distinct pieces, at least two metal rings around the cylindrical portions for guidance in terms of incidence of the preform, respectively;arranging the preform provided with each peripheral metal ring in an injection mould;injecting a thermosetting liquid resin into the mould; andheating the mould to make the thermosetting resin set.