Water Jet / Impeller

I designed and printed this but never had a motor with enough power to give it a proper try
and I didn't want to spend more money on the project so this is as far as I got.

Printed in PETG (the orange parts) and PLA (the white parts), the impeller is 55mm in diameter so you could just use an RC boat prop the same size.

To mount the impeller I got an 8mm nut, drilled out the thread so it slid over the 8mm rod then I drilled a 2.5mm hole in the side of the nut, tapped it to M3. I then gro