Hard Metal Layer
To lengthen the lifetime of the liner, we advise adding a Hard Metal Layer (HML) to the seal. This HML (picture 1, position 7) is applied to the liner using HVOF spraying. Under strictly controlled production conditions, the HML is formed with a high adhesive strength and a porosity of less than 1%, and prevents crevice corrosion which can occur on ceramic layers.
Another option to prevent damage from fishing lines is to install a wire winder (picture 1, position 3) to the propeller hub. The wire winder has an L-shaped cross section and to make sure no lines can slip in, the space between the rope guard and the wire winder is kept as small as possible.
Damage to the seal caused by large abrasive particles can be avoided by adding a dirt barrier (picture 1, position 5) to the seal. The dirt barrier works as an axial lip seal, preventing large abrasive particles and small fishing lines from entering the seal.