Compact speed propeller motor assembly for model boats and small underwater devices. Designed for modification and replacement use, this unit combines a 39mm propeller, motor, and mounting base to deliver reliable thrust in small hulls. Key benefits Direct replacement for small modified boats and underwater robots, restoring or improving propulsion without complex modifications. Available in clockwise or counterclockwise rotation to match existing drivetrains and propeller orientation. Pair option provides matched CW and CCW motors for stable, balanced propulsion and improved maneuverability. Main specifications Hull length: 50 mm Diameter: 31 mm Total length: 76 mm Propeller diameter: 39 mm Operating voltage range: 3 V to 12 V operating voltage: 6 V to 9 V Noload speed at 7.4 V: 16,800 RPM Applicable for modification, remote control boat, pull net boat, remote control submarine, miniature underwater robot Pack options and contents 1PC CW: 1 cw propeller, 1 motor, 1 mounting base 1PC CCW: 1 ccw propeller, 1 motor, 1 mounting base 1 pair CW x CCW: 1 cw propeller, 1 ccw propeller, 2 motors, 2 mounting bases Rotation note CW stands for obverse, CCW stands for reverse Practical use scenarios Remote control boat upgrade: worn or lowperformance propulsion parts to regain speed and responsiveness without changing hull fittings. Pull net boat or retrofit: Install a motor assembly matched to the required rotation to simplify repairs and maintain correct propeller direction. Miniature underwater robot propulsion: Use a CW and CCW pair for counterrotating thrust to minimize yaw and improve straightline control. Installation and compatibility Designed for small hulls with compact dimensions; mounting base included for straightforward installation. Choose CW, CCW, or a matched pair to suit your vehicle configuration and to ensure correct rotation and balanced thrust. This product follows the supplied specifications and is intended for hobby and model applications where compact, RPM propulsion is required.