Yamashita Tai Kabura Hado Head Tama

Small fish do not shake their heads. Sardines swim straight in order to move. From the 

Small fish do not shake my head. Sardines swim straight in order to move from the main body to the tail fins without swinging the head a little. "Wave moving ball straight ahead" that was researched and developed to reproduce this straight movement. Vortex generator (turbulent protrusion) introduced in order to make it straight ahead. This vortex generator is based on fluid dynamics, it generates a turbulent flow to reduce the "large vortex instability of movement" which occurs in the back, mainly used for wings of aircraft etc. . It does not blur even if it receives water flow and resistance, it creates a stable linear movement even in the early tide, directing the natural movement of sardines.