Reddit mentions of uxcell RC Boat Propeller 4mm Shaft 3 Vanes 36mm 1.4 P/D Fan Shape Pastic Black CW CCW Rotating Propeller Props for RC Boat, 3 Pairs

Spent the past few weeks working on this ROV - https://imgur.com/a/lhg9lag 10/10 would recommend PVC. I used 1/2" pipes and used connectors to form the frame. If you're powering it from the surface and it's being used in a swimming pool, I would suggest using only the wires that go to the respective motors for a tether. The less electrical stuff you have underwater the better. You can always pot it, but believe me this is a pain in the ass.

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My suggestions for building:

Bilge pumps for motors- http://www.homebuiltrovs.com/howtobilgeconversion.html

These are great because they're powerful and are already waterproofed. You'll need to cut up the housing and attach props to the shafts for the most power, but they are pretty easy to work with. If you want I can also send you the CAD files to the bilge pump mounts I made. They fit onto the 1/2" pipe.

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Relays and arduino for control - http://www.homebuiltrovs.com/howtorelaywiringmain.html

I can send you a schematic and some code for this if you'd like. I used two arduinos communicating over I2C, one in the controller and one on board, but it's easily adapted to just one arduino.

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RC Boating props for propellors - https://www.amazon.com/gp/product/B01MT5EVJP/ref=oh_aui_detailpage_o06_s01?ie=UTF8&psc=1

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Prop adapters to connect the bilge pump shaft to the props-

https://www.amazon.com/gp/product/B077KYVPBR/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1

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If you absolutely have to put electronics other than motors underwater I would echo what someone else said and get a pelican waterproof case. (you can also go to walmart and buy cheap ones)

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