Great, thanks Guy.

At 770Kv, 350W, 20A, its pretty damn close to the motor I was thinking to use, which is 700Kv, 340W, 23A. Looks like the W/Amp ratio is better on yours, suggesting its slightly more efficient. Its almost 3x the cost also.

My plan is to run a pair of motors and 12x3.8 SF props (i.e. differential steering) on a slightly larger but planing/skimming platform (105cm boogie board), so might need to run closer to 20,000mAh to get a similar runtime. I'm using the Hook4 also, but may also be adding a water quality meter (more weight).

Thanks again. Really helpful.

Aaron