Home CRAFTS Building & Testing a Radio-Controlled Lego-Powered Submarine

Building & Testing a Radio-Controlled Lego-Powered Submarine

The most common form of RC submarines are those operated by hobbyists. These can range from inexpensive toys to complex projects involving sophisticated electronics.

source/image: Brick Experiment Channel

Brick Experiment Channel shows how he makes a a radio-controlled submarine with Lego and other materials.The Lego-Powered Submarine uses a water jug as a hull. The video takes you through the process of sealing the hull itself, before dealing with sealing the rotating propeller shafts.

A large syringe is used as a ballast tank, with Lego motors used to actuate the tank and provide propulsion and steering.An existing RC submarine is used for parts, providing the necessary radio control hardware.”At the end I test it in a lake.”


The submarine specs:

  • Length: 22 cm (8.7 in)
  • Displacement: 1880 grams (66 oz)
  • Speed: 0.2 knots (10 cm/s)
  • Operating depth: 3 m (10 ft) – ballast tank will fail after that
  • Hull: 1.5 liter lemonade pitcher (Orthex)
  • Forward: Lego m-motor runs two 9-length propellers (2952)
  • Turn: Lego m-motor runs a geared-up (0.67:1) small 3-blade propeller (6041)
  • Ballast tank: Lego m-motor runs a Lego linear actuator connected to a 60 ml syringe
  • (Eotia marinade injector). Active range 20 ml
  • Radio control: 27 MHz controller dissembled from a toy submarine (Zantec Mini RC
  • U Boot). L298 H-bridge to drive motors
  • Power supply: 9V Lego battery box for the motors, 3.7V battery for the radio controller