Tamiya 70186 Underwater Gearbox Project Kit  [70186]

Underwater Gearbox Introduction

The Tamiya 70186 Underwater Gearbox Set is aimed at makers and educators who want a simple way to study mechanical motion. The parts invite experimentation and let builders explore propulsion concepts by assembling working models. It works well for swimmer prototypes and amphibious test rigs.

Notable Parts and Educational Uses

This kit contains a Submarine Motor Mini (High Speed Type) and features a 28.9:1 gear ratio. An attachment plate is included so the gearbox can be fixed to foam board (sold separately) with screws, making it practical for quick model assembly. Operation requires one R03/AAA/UM4 battery (not included). The straightforward design makes it useful for teaching gear interaction and basic underwater drive systems.

Building Tips and Compatibility

Whether you are creating a display model or a classroom exercise, the Tamiya 70186 Underwater Gearbox Set can be combined with other Tamiya items to broaden functionality. Its mounting options and common motor style make it easy to adapt into larger builds.