A conservation approach to helicoidal surfaces of constant mean curvature in R³, S³ and H³

We develop a conservation law for constant mean curvature (CMC) surfaces introduced by Korevaar, Kusner and Solomon, and provide a converse, so as to characterize CMC surfaces by a conservation law. We work with `twizzler' construction, which applies a screw-motion to some base curve. We show that, excluding cylinders, CMC helicoidal surfaces can be completely determined by a first-order ODE of the base curve. Further, we demonstrate that in R^3 this condition is equivalent to the treadmillsled characterization of helicoidal CMC surfaces given by O. Perdomo.