Mikael at Candela, the hydrofoil maker, here. Our P-12 uses submerged hydrofoils and emplys a digital Flight controller, which stabilizes the craft by adjusting the angle of attack of the foils 100 times per second. So the pitching and heaving you found nauseating in the old Soviet Raketa and Kometa hydrofoils don't exist in P-12 - it's smooth sailing even in. chippy weather. Watch this video: https://www.youtube.com/watch?v=xIp9OkMzZkM