On old maps of Asia, where as medieval cartographers would draw sea monsters in the oceans, they would sometimes draw Mongol sail carts in the middle of the steppe. On the Central Asian steppes unencumbered by fences sail carts could cover 200 km a day.
And Mongolia seems to hold a special connection with land yachting to this day. The Polish are mad keen at crossing the Gobi Desert on land yachts.
So I think that the Pterosail Trikes are beyond a great idea. They are a cross between a land yacht and a recumbent trike. They look fantastic. I want to have a go. I want to have a go.
With panniers on that back rack, a trailer with a tent in it, and a year off work and I would be a very happy man.
Update: A commenter (thanks David) on this post pointed out the Whike, a smaller sail recumbent trike, which also looks like it would be a whole lot of fun.