”FinX says the linear propulsion consumes less energy than traditional rotational propeller systems and also claims the design produces less noise and agitation in the water, making it a less impactful on marine life…
With the accompanying 72-Ah 48-V lithium battery, the FinS delivers an estimated top speed just under 7 mph (11 km/h). It's made to run at top speed for up to an hour and 45 minutes before draining the battery. Dialing speed back to 3 mph (5 km/h), the system can deliver up to eight hours of on-water time per charge. Estimated ranges come in at 10.5 and 21 nautical miles (19 and 39 km) at those respective speeds.”