Yeah that's pretty sweet. Needs some bikinis to go with the lights though. 
Electric Ski Boat
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Bikinis make everything better
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Put that in there with the blue-lit Star Trek motors and I'll take one today!Bikinis make everything better
Why not? Seems perfectly logical to me with lithium batteries. It's probably a bigger adujustment for them than cars though, because they're used to having a couple tanks full of dino fuel. I used to hang out with guys with 21-26ft speed boats (big and small block Chevy race engines). We could stay out there pretty much all day, and the boat just got faster as the fuel load lightened. We'd just ride around the lakes, burning off excess fuel, looking for a race.
My first thought when I saw the title of this thread was that thing should get on plane quick, with full torque available so quickly. I was a little disappointed that they didn't really let us hear the boat. If the guy wasn't talking that stupid music was playing.
That and the fact that there weren't any bikinis in it...
JRP3 fixed that issue quite nicely though! 
The man's got a point...
Do a small personal watercraft with some LiPo, just for the fun of it!
I'm guessing "above displacement speed" is what I called "getting on plane"? My terminology comes from my limited exposure being a "co-pilot" in one friend's boat. That's what they called the point where the boat is as far out of the water as it's going to get (with the exception of actually getting airborne - not good). His boat was a 21ft Hammond, with a nasty 420" small block Chevy, that just seemed to pop up out of the water. We could put enough distance on the bigger big block boats out of the gate that most couldn't catch up. That's what I think an electric boat would be good that though.
Top speeds were around 70-75mph. I can imagine getting there and maintaining that would take a serious chunk out of the pack, and you're right - putt-putting around with the front end hanging in the air isn't much fun. We had to be either trolling just above idle, or really hammering it, to have fun.
G
You'd need a pack that can withstand the amp output and a controller that can do the same. Getting to plane will really tax that controller. It must be able to provide enough to get you to plane then it will settle down. I have a nice light weight 64 Correct Craft. 16 ft ski boat. That would do for a conversion. Fun, and fast. Light and agile.
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Been thinking about that too, I have a SeaDooHX, but I'm not sure I could pack enough batteries in it to get more than 10 minutes of full throttle, and I'd need a sealed water cooled motor. It would be an expensive project with limited use at this point.Do a small personal watercraft with some LiPo, just for the fun of it!
Basically. Below displacement speed boats take little energy to move, once you try to go above displacement resistance goes way up until you get over the bow wave and get up on plane, if it's a planning hull. Then you can keep it on plane with less energy but still more than sub displacement. A lighter flatter bottomed boat would be easier, similar to what gottdi posted. I've got a 23ft. deep V with a 454, not the best project boat.
What about an air-cooled motor in a sealed compartment, with a shaft protruding through to the prop? Could possibly even do a water-to-air cooler for the air, since there's a never-ending supply of cool water. Of course, I'm going off into my high-budget, sky's the limit, ideas again huh.
I've never been into boats enough. I briefly toyed with the idea of it when my friends were racing them, but backed out when I got close to signing loan papers on one. It was way more expensive than my dragbikes...
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