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  • SpaceShipOne commented on SpaceShipOne's instructable Underwater ROV
    Underwater ROV

    The original design had leads running to the surface to measure voltage with. This was inaccurate as it did not account for voltage drop over the length of the tether. A better design would haven been to measure the voltage at each battery and transmit that data to the surface. I should mention that this project has been deprecated for a while. It was a good learning experience and a fun project, but not very suited to the task of diving underwater.

    Bilge pumps are not very effective at any great depth (if your boat sinks that far you have bigger problems than the pumps not working). The design of the shaft seal on rule bilge pumps means that the increasing water pressure as you dive deeper puts more friction on the motor shaft. This eventually led to seal failure and water intrusion into the motor housing. They will work at shallower depths, but for anything below 20-30 ft I would not recommend them. This project has been deprecated for a while, but if you are interested in making something similar I recommend looking at Blue Robotics. They have a thruster specifically designed for ROV use which is far superior to the design I used, as well as a great selection of components for building an ROV. You can expect to pay significant…

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    Bilge pumps are not very effective at any great depth (if your boat sinks that far you have bigger problems than the pumps not working). The design of the shaft seal on rule bilge pumps means that the increasing water pressure as you dive deeper puts more friction on the motor shaft. This eventually led to seal failure and water intrusion into the motor housing. They will work at shallower depths, but for anything below 20-30 ft I would not recommend them. This project has been deprecated for a while, but if you are interested in making something similar I recommend looking at Blue Robotics. They have a thruster specifically designed for ROV use which is far superior to the design I used, as well as a great selection of components for building an ROV. You can expect to pay significantly more, but you also can be confident that the thruster has been tested at depth and performs it’s intended function.

    The Ethernet connector was a great idea in theory, but it was not at all suited to a high pressure environment such as would be found underwater. I struggled with water leakage all the time and eventually had to scrap the design entirely and switch to a permanently attached tether. The type of connection used on professional ROVs are fully sealed and use a much more robust design that minimizes any air pockets which could cause leaks.

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  • SpaceShipOne commented on SpaceShipOne's instructable Cinema Slate
    Cinema Slate

    That looks great! I like your use of dot matrix displays.

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