Interesting motorboat

 Interesting motorboat spotted going though Bursledon bridge.

Guessing it's electrically powered judging by the high waterline length to beam ratio which would make for high efficiency and best use of battery capacity.

 If the long thin aspect seems reminiscent of many of the early 20th motorboats, perhaps that's because they knew a thing or two about a thing of two and getting good performance and economy out of the limited power that engines of the day could provide.