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]

Animatic of a Rotating Hemihelix

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

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.^[3]