"One of the advantages of FinX technology is its efficiency,…

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https://plugboats.com/amazing-new-electric-boat-motor-based-on-fish-fins/
"One of the advantages of FinX technology is its efficiency, comparable in some ways to the Deepspeed hydrojet motor being developed in Italy. The FinX is 20 to 30% more efficient than propellers.

More efficient, nothing to get tangled
Another advantage is that no propeller means more safety for swimmers (and fish) and nothing to get tangled or caught up in its working. A video on the FinX YouTube channel shows it in a tank of polluted water to demonstrate how things like algae, plastics and fishing line pass through it.

Harold Guillemin, CEO of the new electric boat motor FinX, at the Nautic Paris show with two of his researchers The company has been around less than a year, but has already had great reception not only at Nautic Paris but also at the Vivatech startup convention, St. Tropez Sustainable Mobility Summit and Monaco Solar and Energy Boat Challenge last July.

Two motors are available for pre-order on the FinX website now: the D70 for drones and other small watercraft (€199) and the D200 – a 2kW / 5hp motor with a pod-like configuration at €2990"

https://plugboats.com/amazing-new-electric-boat-motor-based-on-fish-fins/