Due to the long-term use of copper propellers, the collision of floating objects, the hitting of reefs or the rolling of steel cables will deform the blades and often cause blockages and cracks. After the blade is deformed, the light will cause the pitch to be inaccurate with the normal, resulting i

Why do ships use propellers instead of fishtail-like devices? At present, there is a contradiction in bionic propulsion: if the mechanical design is more complex, that is, the closer to the fish tail, the more serious the energy loss is, and the more complex the control is. In the final analysis, bi