Underwater Propulsion System for Paddleboards/Kayaks

A set of 10 sequential prototypes for an underwater paddleboard propulsion mechanism, designed as part of a self-run engineering challenge to propel a paddleboard using as much custom hardware as possible.

Design

DC motors were used with a 3d-printed enclosure, custom generated propellers, and a compressed air water evacuation system. Custom power supply circuitry optimises solar panel input power using maximum power point tracking, and alters speed via user input. Power is roughly 150 watts, speed is roughly 1.5m/s

Impact

Total cost of system is far less compared to similar existing propulsion systems due to the use of lower-cost components and simpler sealing mechanisms. Technology could be used by leisurecraft such as paddleboards and kayaks and for small fishing vessels.