Remember that crazy battery-powered jet surfboard? Turns out it's pretty quick, pushing 20 pounds of thrust good for up to 20km/h for a run time of almost 40 minutes. That's three times faster than most humans can paddle.
The drawback is that the kit weighs an extra 7kg. Good for stability, bad for manoeuvrability, but since average surfers aren't going to spring on the $US4500 for this tech, it stands to reason that lifeguards on rescue boards, big wave tow-in guys who might otherwise use jetskis and other types might find something to like here.