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Helical propulsion is used by many microorganisms to swim inviscous-dominated environments. Their swimming dynamics are relatively wellunderstood, but detailed study of the flow fields and actuation mechanisms arestill needed to realize wall effects and hydrodynamic interactions. In thisletter, we describe the development of an autonomous swimming robot with ahelical tail that operates in the Stokes regime. The device uses abattery-based power system with a miniature motor that imposes a rotationalspeed to a helical tail. The speed, direction, and activation are controlledelectronically using an infrared remote control. Since the robot is about 5centimeters long, we use highly viscous fluids to match the Reynolds number tobe $\text{Re} \lessapprox 0.1$. Measurements of swimming speeds are conductedfor a range of helical wavelengths, $\lambda$, head geometries and rotationrates, $\omega$. We provide comparisons of the experimental measurements withanalytical predictions derived from resistive force theory. This force andtorque-free neutrally-buoyant swimmer mimics the swimming strategy of bacteriamore closely than previously used designs and offers a lot of potential forfuture applications.

Force and torque-free helical tail robot to study low Reynolds number microorganism swimming