This Tamiya kit gives a clear, tactile lesson in fluid dynamics and mechanical motion. The impeller-driven centrifugal pump draws water in and forces it out a nozzle to create forward thrust, while the rudder allows basic course adjustment.
The model is compact and quick to assemble, combining six main parts that snap and screw together. Builders get two sets of decals for custom looks, and a suction cup is supplied so the motor and pump can be repurposed for other experiments.
Operation needs one R03/AAA/UM4 battery which is not included in the kit pack.
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