KIT33R said..Here's some more of these weird contraptions. They say when you stack it, it's like falling off a ladder at 30kph and then having the ladder run you over.
The rider there, Johhny Heineken, is more or less world No 1 racer. I think he disappeared for a month or so and swallowed a lot of seawater in secret, to reappear and pull tacks and jibes like that vid (of him training tacks/jibes). He was immediately +20-30% faster than the rest of the field & they are scrambling to catch up. Those foils are now the hottest thing in kite racing and have a 3k price tag and a long & growing wait time. (so I heard...)