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kiteboy dave said..
I'm skeptical.. I don't think the power is there yet, both in the motors and the batteries. They're (possibly, if not fake viral vid) making it work with a running start in super shallow water, and not really carving at all.
Bigwavedave said..
I call big fake!
A 10 HP engine on a tinny couldn't do that and a 3000 mA/H lithium battery can?
I call if your avatar has '..... dave QLD' in it your you may not of tried to find any additional info on the vid

Do you trust it is priced from $17,495
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However the creators of the clip, a company called ‘Freefly Systems’ were quick to come back to us and inform us that whilst they did not recommend that their drones were used for such an activity, and it was purely for experimental purposes, it was very much real.
wavelengthmag.com/drones-future-tow-surfing/
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Anyhow some of the drone specs...
Maximum Payload3 9.1 kg (20.0 lbs)
Typical Specific Power 145 W/kg
Nominal Battery Voltage 6S / 22.2V
Required Minimum Battery Discharge Rating 250A / 500A Peak
freeflysystems.com/alta-8/specs