Navee – a Chinese mobility brand that's probably best known for e-scooters like the ST3 Pro and UT5 Ultra X and electric dirt bikes such as the Storm X Pro, but also has golf carts and exoskeletons in its ecosystem – just adapted one of the Cold War's strangest engineering ideas into a personal watercraft that is part aircraft, part boat. The Suzhou-based company unveiled its WaveFly 5X at Lake Taihu on June 5, calling it the world's first wing-…