I know it can sound a bit far off and out of reach (at least for our budget), but the space elevator project is an amazingly interesting idea :
AND HAVE YOU NOTICED !!!!??? : the space elevator is anchored on earth in a offshore petrol platform looking thing!
It is actually is a simple solar powered elevator on a tense cable, attached in space to a "satellite" in synchronous orbit, EXCITING! Maybe open sailing can be a very interesting laboratory for testing many of these ideas, also before a cable in space we can think of a cable in the depth of the ocean. And by the way, what if we concentrate huge beam of solar power in the direction of the ocean? What would we see? ... To be continued!