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Imax1 said..
But what if the BCF trolling motor was worked fully sick !
In fact we don't really know what exact power in kw we need to get our surfboard flying (planning).
We means me and you possibly, as those people on the movie above has some ideas already.
This days you could buy electric motor with power rating more then 2 kw per kg! But trolling motor have another advantage. Keeps your boat , jet ski shell moving at reasonably safe speed, cost few hundred dollars and you could have project done in few hours.
Then you could go fishing on converted electric jet ski everywhere - including fresh water dams.In fact I will not be surprised if plain trolling motor 1 kw will give your board -specifically wide windsurfing - planing speeds . When we did recent experiment with "scurfing" towing behind boat, you could easy stand on the board and keep line one hand.
No more then few kilo pulling force needed to plain behind boat on windsurfing board.Apply this same 1 kw motor to hydrofoil Moth and will be planning in no time at all.Then we could talk about cost jet ski vs. anything else. Who want to spend 20 -50 liters of petrol per hour ?