Electrical hydrofoil device and power supply cable assemblly thereof

An electrical hydrofoil device, comprising a hydrofoil watercraft that comprises a propulsion unit, an electrical power box that receives and holds a battery and an electrical controller, an electrical power cable that is connected between the electrical power box and the propulsion unit, a body wearing article wearable on an operator's body, and a safety lanyard that connects between the body wearing article and the hydrofoil watercraft, wherein the electrical power box is connected with the body wearing article to be carriable by the operator;

• the battery and the electrical controller are in electrical connection with each other, and electrical power of the battery and a signal of the electrical controller are transmittable through the electrical power cable to the propulsion unit;
• the electrical power cable comprises a helical curling portion and a straight line portion, and the helical curling portion is formed of a plurality of successive helically-wound coil turns having a predetermined length, wherein the helical curling portion of the electrical power cable, when acted upon by a force, is stretchable to extend the length and when not acted upon the force, resumes the helically-wound coil turns to shorten the length.