10 Tiny Motors Underwater — How Much Voltage Can They Take?

Ten small DC motors. One water tank. Higher and higher voltage. Which designs keep spinning, and which give up first? From a tiny 816 coreless motor to a flat 300 motor, each gets a turn. Along the way, a lead wire burns through, a gear comes loose, and two motors get a separate run in air after their underwater tests. The final comparison is at the end. CHAPTERS 00:00 Opening + 816 coreless motor 00:35 K30 — the slim challenger 01:23 050 — first run 02:14 The thin lead wire burns through 02:28 050 rematch with thicker wire 03:39 030 — a gear comes loose 04:53 Standard 130 06:25 Red 130 — underwater run 07:01 Red 130 — separate test in air 07:32 180 — the longer underwater run 10:42 180 — separate test in air 11:15 Yellow-cap 260 12:20 Round-can 140 13:29 Flat 300 — final setup 14:20 Flat 300 — voltage ramp + final results MOTORS TESTED 816 coreless, K30, 050, 030, standard 130, red 130, 180, 260, 140, and 300. Model names follow the supplied seller reference and the visible motor shapes; variants sold under the same name may differ. HOW TO READ THE RESULTS • Voltage labels are approximate readings shown on the power supply, not independent measurements at the motor terminals. Display updates and current limiting can affect what is shown; the supply's voltage, current and power readings may not update together. • “Stopped” describes the visible end of a run and the associated display/current change. It does not identify the exact internal failure mechanism. • The red 130 and 180 were still running when their water tests ended at a displayed 61 V. Their underwater failure limits were not reached. This does not mean that either was tested above 61 V. • Their later air tests are separate: approximately 16.6 V for the red 130 and 43.7 V for the 180. These values are not included as underwater failure results. • The 050's first interruption was a thin lead-wire failure. Its motor result comes from the rerun with thicker wire. • These are observations from individual samples under changing test conditions, not manufacturer ratings, recommended operating voltages, a controlled durability ranking, or proof of waterproofing or long-term reliability. SAFETY DISCLAIMER This video documents a destructive electrical experiment. It is not a tutorial or a recommendation to repeat the setup. Electricity near water can cause electric shock and short circuits; overloaded motors and wiring can cause burns, fire, and flying debris. Do not attempt to recreate this experiment. Use motors only within their manufacturers' specified limits and intended conditions. Which motor surprised you most? Leave the model name and your prediction before watching the final results. #DCMotor #MotorTest #UnderwaterExperiment