Hemihelix

A hemihelix is a curved geometric shape consisting of a series of helices with alternating chirality, connected by a perversion at the reversals.

[1][2] The formation of hemihelices with periodic distributions of perversions in slender structures is understood in terms of competing buckling instabilities generated by in-plane stresses.

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Animatic of a Rotating Hemihelix
Video recording for a hemihelix with one perversion under water. Both ends are free to rotate.