Each kindergartener is aware of that water and electronics don’t combine, which is why you is likely to be shocked to study which you could run normal drone-style brushless DC motors underwater with none points. Whereas corrosion may ultimately change into a difficulty if the motors don’t have any safety, the shortage of brushes on the motors implies that nothing with electrical present makes direct contact with the water. That dramatically simplifies the development of underwater ROV (Remotely Operated Automobile) submarines. To place that idea to the take a look at, YouTuber RCLifeOn constructed an ROV submarine utilizing normal drone elements.
A typical quadrotor drone, like the sort RCLifeOn scavenged for this mission, accommodates 4 necessary digital elements: a battery pack, a flight controller (typically with a built-in radio transceiver), ESCs (digital pace controllers), and brushless DC motors. These are precisely the elements that went into this underwater robotic, together with an FPV (First-Particular person View) digicam system. To simplify the design and get rid of the necessity for further motors, RCLifeOn selected a novel propulsion association.
Two propellers face ahead and supply ahead/reverse thrust and yaw management. The opposite two propellers face upwards, offering up/down thrust and roll management. There is no such thing as a direct management for pitch alone, however RCLifeOn can form of maneuver pitch with a mix of ahead thrust and up/down thrust. That, together with the form of the sub’s hull, can successfully management pitch because the craft strikes by the water.
RCLifeOn designed the ROV’s hull in Autodesk Fusion 360 after which 3D-printed it. He additionally 3D-printed a floating radio tether, which is important as a result of radio waves at this frequency have poor penetration by water. The floating tether offers a clear radio sign between the receiver and the distant, after which sends the management instructions to the sub by an insulated wire. RCLifeOn strapped a GoPro onto the sub’s hull to seize presentation-worthy video and likewise integrated an FPV digicam for controlling the ROV in actual time.
As you’ll be able to see within the video, the submarine labored fairly nicely — at the least at first. However ultimately water made its approach by the seal within the hull and reached the flight controller and ESC electronics. In contrast to the brushless DC motors, these are very delicate to water publicity they usually failed quickly afterwards. However even with that mishap, this ROV proves that your standard drone elements are well-suited to constructing underwater robots.