electric catamaran boat to set world record

[pcrussell50]

i look forward to learning what they have to say. I think its a cool project, im just not convinced on the practicality of it yet. Im sure with further advancements in techology, things will change one day, but there is still a ways to go.

Depends on what you consider to be practical. If all you are is a racer and not a day boater, the two good passes you get before battery performance dropoff might be all you need. If you are a recreational boater who goes on poker runs or such, then this won't cut it for you.

The math is pretty simple. E-Motion uses two 35KWh batteries, for a total of 70Kwh. That means you can make 70KW (about 94 horsepower), for one hour (if you have a full charge and take it to zero, without leaving any to motor on and off the trailer). You can divide it up any way you like. So for example, with the same battery, you can do 188 horsepower for half an hour (again leaving nothing left to motor on and off the trailer or through the no-wake zone. Or you can make 47 horsepower for two hours, taking the battery from 100% to zero.

So you do the arithmetic, and see if it is practical for you.

Weight is also a consideration. E-Motion does not share it's battery weight, but a Tesla 100KWh pack is over 1200 lbs just for the battery and nothing else. (It may be more. Tesla and the BEV community in general are not very up-front about things like battery weight). The new Hummer EV 200KWh battery pack is 3000lbs... Again, just for the battery and nothing else. You can extrapolate back to get a ballpark figure for an E-motion battery.

Kilowatts have nothing to do with electricity. A kilowatt is a unit of power just like a horsepower. One horsepower is 550 lbs.ft/sec. One kilowatt is 1.341 horsepower, or 738 lbs.ft/sec. Simple arithmetic, really. I have no idea how it came to be that the USA would use International units only for electrical power, but not for mechanical power. They are the same thing. Power is power.

HTH

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Oh, I left out the non-planing hull use-case. E-Motion sells complete electric boat packages like this:
https://visionmarinetechnologies.com/volt-en/

Watch the video. If that is your thing in boating, today's electric is for you. They do not sell planing hull boats.

Peter