Smooth surface forming tool and manufacture thereof

A method of manufacture of a composite aircraft article having an aerodynamic surface by forming the composite aircraft article having the aerodynamic surface on an aircraft article composite forming tool, wherein the aircraft article composite forming tool comprises a matrix laminate comprising a plurality of laid-up plies with an upper ply including a forming surface for forming said composite aircraft article having the aerodynamic surface, the upper ply of the aircraft article composite forming tool comprising a nano filament structure embedded therein, wherein a portion of the nano filament structure is exposed to the forming surface and wherein the nano filament structure comprises nano filaments that as a whole have a well-defined perpendicular orientation relative to an extension of a plane of the upper ply;

• the method comprising:
• conforming a blank onto the aircraft article composite forming tool;
• forming the conformed blank on the upper ply of the forming surface, wherein the forming surface of the aircraft article composite forming tool is adapted to form the aerodynamic surface of the composite aircraft article;
• curing the formed blank into the composite aircraft article having the aerodynamic surface;
• and
• finishing the composite aircraft article.