What's that called, a Junk-rigged sail?*
Impressive that at 3:06 they 'dug a trench' that appears to be a canal 10s of meters wide and kilometers long for speed runs.
edit: *
I guess not, a
https://en.wikipedia.org/wiki/Junk_rig extends ahead of the mast.
But still, they show a lot of [J-hooked turns] but it appears to stop them. At 4:17 they edit two turns together to look like a [slalom]. [not-ical terms?]