Tamiya 71125 Mechanical Fish STEM Robotics Kit  [71125]

Tamiya 71125 Mechanical Fish: Practical STEM Model

The Tamiya 71125 Mechanical Fish is part of the Robocraft Series and offers a compact, instructive build focused on movement and basic engineering. It encourages experimentation with mechanical linkages and buoyancy through a neat, swim-capable design.

How It Moves

A crank arm mechanism drives the tail to mimic swimming. The upper body floats so the dorsal fin sits at the surface while the lower sections submerge, and fin adjustments let you experiment with different swim behaviours and trajectories.

Simple Build, Clear Learning

The kit snaps together without cement, making it accessible to newcomers and younger builders. It takes one AAA battery (not included) to power the motor, helping users learn about basic circuits and power for small electric motors.