strakes

A type of aerodynamic surface mounted on an aircraft fuselage to fine-tune the airflow.

Also used more generally to regulate fluid flow in pipes or vents to prevent turbulence or vortexes.

A continuous line of plates or planks running from bow to stern that contributes to a vessel's skin. (FM 55-501).

A shaped piece of wood used to level a bed or contour the shape of a mould, as for a bell

A trough for washing broken ore, gravel, or sand; a launder.