This is a RC jet boat that I created that use the below jet assembly. (https://www.thingiverse.com/thing:2586772)

I always wanted to try designing a RC boat and when I came across this jet assembly on Thingiverse I thought I would give it a try. The original design was made from foam board and it worked okay. I then created this 3D printable version. It is a fully custom design boat hall and uses some spare RC electronics I had laying around. The boat was modeled using Creo and then printed and assembly by me. It has a water cooling loop for the ESC, magnetic top lid, and an optional FPV camera. I also created a trailer for it that can be towed by a 1/10 scale RC tuck.
Being that it is a jet boat it can run in a lot more spaces then a prop. It works very well and I hope to upgrade the electronics in 2023.
I have posted it to Thingiverse (https://www.thingiverse.com/thing:5030928) this shows the instructions on how I built it.