How much drag there is?
We spent a lot of time trying to find a perfect balance between shape, power, and battery life. The components are compact enough to where we were able to house them into a streamline casing that allows for minimum drag while paddling or riding.
While on a wave, Boost Fin doesn't create any significant drag because of the feathering prop. They have a maximized propeller pitch and a blade surface nearly parallel to the water flow to minimize resistance when they are not in operation.