I was have a nosey at the Museum of Flight's website and it occured to me that one could make a solar powered UAV and send it off to circumnavigate the world.
It'd be a bit tricky, you'd have to design the frame carefully to provide lots of lift for minimum thrust, you'd have to balance the power so it's a low load which can run off battery for quite a while (if you sent it over the poles it'd have to cope with periods of more dark than light), that kind of thing.
Then it struck me that a boat would be simpler. You wouldn't have to worry about the weight as much, you'd need fewer instruments (no tilt, altitude or airspeed sensors) and if it ran out of power it could just sit and wait til it was sunny again, then set off.
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