Over the weekend I made my first model in #freecad. The design is of a contra-rotating gearbox, based off this video https://www.youtube.com/watch?v=xda1WgL9fd0&list=PLJH7IqpOoNLpc9NVpY-d0J0OlvtPcMqAi&index=12
It allows two propellers to rotate in opposite directions with one motor. This reduces the torqueing that occurs with just one.
I'm going to be using it for my #seamoth #auv to keep it small.
Here's the 3d printed result. It doesn't turn as well as I would have liked. I think it's mostly down to an issue with the print but there are a couple tweaks I could do to make that less likely #3dprint #freecad #auv