Helical strake

A helical strake, also known as a Scruton strake, is a helix-shaped fin arranged along a structure to disrupt fluid flow. It serves to mitigate fatigue by disrupting the vortexes forming a Kármán vortex street, thus reducing the resulting vibrations. Introduced by Christopher Scruton and D. E. J. Walshe in 1957, helical strakes have been widely adopted as an engineering solution for controlling the oscillations caused by airflow and water flow.

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