Lip skin with hydrophobic and hydrophlic surfaces for an aircraft aerostructure

An air inlet section for an aircraft propulsion system nacelle, the air inlet section comprising:

• an outer skin forming an outer annular body extending circumferentially about an axial centerline of the aircraft propulsion system nacelle;
• an inner skin forming an inner annular body extending circumferentially about the axial centerline, and the inner skin is disposed radially inward of the outer skin;
• a lip skin extending circumferentially about the axial centerline, the lip skin extends between and to an outer end and an inner end, the outer end is disposed at the outer skin, the inner end is disposed at the inner skin, the lip skin forms an exterior lip skin surface extending from the inner end to the outer end, the exterior lip skin surface forms a leading edge of the lip skin;
• a hydrophobic coating disposed on the exterior lip skin surface radially outward of the leading edge;
• and
• a hydrophilic coating disposed on the exterior lip skin surface radially inward of the leading edge.

An aerostructure for an aircraft, the aerostructure comprising:

• an outer skin;
• an inner skin;
• and
• an arcuate lip skin extending between and to an outer end and an inner end, the outer end is disposed at the outer skin, the inner end is disposed at the inner skin, the arcuate lip skin forms an exterior lip skin surface extending from the inner end to the outer end, the exterior lip skin surface forms a leading edge of the arcuate lip skin, the exterior lip skin surface includes a hydrophobic surface and a hydrophilic surface, the hydrophilic surface disposed at the leading edge, and the hydrophobic surface extending between and to the hydrophilic surface and the outer end.