This is a working scale model of the RX-2 Chaipattana Low Speed Surface Aerator.
It was developed in Thailand by King Bhumibol Adulyadej. It has inspired the development and distribution of a wide variety of surface aerator systems now used throughout Thailand to turn otherwise stagnant water into a resource for agriculture, aquaculture, and recreation.
For more information about the aerator, see here: http://www.progressth.org/2017/10/3d-printed-rx-2-chaipattana-low-speed.html
It uses 12V DC 35byj46 stepper motor and driver board + Arduino Nano.
It requires extensive friction welding to assemble. Use a back light to see where gaps may be to ensure your welds are water-tight. Using aquarium silicon sealer along the welds may also be a good idea. A hole drilled in the top of the pontoons fitted with a stopper could be used to drain the pontoons if they take on water.
The motor housing should be either tack welded (using 4-6 spots of welding instead of a single continuous bead along the seams) or hot glued in place. This allows you to remove the housing to work on or replace the motor in the future. Also at spots of hot glue onto the nuts securing the bolt because they come loose during the aerator's operation.
Info on the welding process including a link with a video can be found here: http://www.progressth.org/2017/07/diy-friction-welding-warped-3d-prints.html
The SketchUp file is include and is also available in SketchUp's 3D Warehouse here: https://3dwarehouse.sketchup.com/model/0e1db761-46ee-4a45-993e-233a70991783/RX-2-Chaipattana-Low-Speed-Surface-Aerator
The system does float and works on water. If you decide to do this, please exercise EXTREME CAUTION and do so at your own risk.
We're a freelance industrial design house in Bangkok, Thailand. We also like to upload and share free projects to inspire others to get into 3D design and 3D printing.