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US 2019/0315451 A1Published application
Propeller blade spar
AssigneeRatier-Figeac SAS
InventorsBruno Seminel, Stanislas Tutaj
Life of this patent
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Abstract
A method of manufacturing a spar for a propeller blade comprises forming a hollow inner core from a composite material, and then braiding carbon fibres around the inner core to form an outer spar structure. The hollow inner core may be formed using an inflatable bladder and a mould defining an outer shape of the spar. This construction avoids the need for a foam core to be provided within the spar.
Claims15
A method of manufacturing a spar for an airfoil, comprising:
- forming an inner spar structure comprising a rigid body formed around at least one inflatable bladder or a removable core and mounted to an airfoil root, the rigid body being formed from a composite material;
- and
- forming an outer spar structure about the inner spar structure, the outer spar structure being formed from a composite material.
A spar for an airfoil, comprising:
- an inner spar structure having a rigid body mounted to an airfoil root, the rigid body being formed from a composite material, and the rigid body defining a hollow internal cavity or an internal cavity filled by at least one inflatable bladder or a removable core;
- and
- an outer spar structure formed about the inner spar structure, the outer spar structure being formed from a composite material.
Dependencies are inferred from the claim text.