25 blade water propeller

thingiverse

This is a propeller that's super useful for many tasks, but it performs incredibly well in water - I put a standard, unmodified Lego motor on it and spun it straight down into the water, where it behaved like a drill. There was no water above the propeller at all. It created something similar to a water tunnel. The pull force is also insane, with enough power to pull my hand into the water several times. It doesn't work very well in air, though - only in water! If you'd like me to build something for you, just let me know. I'll be happy to help out. You can contact me at https://milenkovicluka449.wixsite.com/milenkovic