hydrophobic coating

Hydrophobic soil is a soil whose particles repel water. The layer of hydrophobicity is commonly found at or a few centimeters below the surface, parallel to the soil profile. This layer can vary in thickness and abundance and is typically covered by a layer of ash or burned soil.

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    Rain repellent.

    Presumably the application of a good quality rain repellant should reduce drag and therefore increase battery range. Has anyone come across any tests of this?
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