Building a fast Lego motorboat with two submerged Lego propellers. Only Lego parts are used, except for a BuWizz 3.0 battery box. Enjoy!
Battery box: BuWizz 3.0 Pro
Motors: 2x Lego Buggy motor 5292c01
Propellers: 2x Lego Propeller 2 Blade Twisted 4745
Propeller attachment: double-sided tape rolled on a Lego axle
Hull: Lego Hull Giant Bow 4245c01
More details in my blog, including a part list and 3D model for the motorboat: