MOAT BOAT BATTLE TomasC supersport
Ready for http://www.moatboatpaddlebattle.com/
Because the ship's propeller inventor was from Czech https://en.wikipedia.org/wiki/Josef_Ressel the ship's propellers was the first choice.
For racing I used 6 loops of TAN SUPER SPORT rubber 1x3.2 mm from https://www.horejsi.cz/Pages/DetailProdukt.aspx?objcislo=0026-02
I found the ship's propeller here on the web and heavily edited, but I can not find the original source, just a photo. If I find I'll add.