Mechanical winch has 10KG maximum payload and 25m rope length, battery powered by 22-56V with 0.1-0.6m/s retractable speed and mechanical release device with counterweight block. It supports standard SBUS control and optional remote control PWM RS232 RS422, with functions of automatic rope arrangement automatic unhooking limit stop touch bottom stop and fault alarm. RS232 RS422 enables real-time data display and custom setting for ground station development.