Sit-down hydrofoil

[2] After various material changes, including the addition of a seat belt to keep rider and ride together and prevent separation collisions, they sold their first "Air Chair" in 1990.

[2] Advancements in materials and hydrofoil design have created stronger rigs, gentler rides (shock absorbers in the seat), more maneuverability, and boards that combine sit-down and stand-up (air board) for surfing.

In order to "float" upward, the rider leans back while maintaining balance to avoid pitching forward unexpectedly.

Submerged hazards such as trees can be struck by the hydrofoil as low as 3 feet below the surface of the water, causing the rider to fall without warning.

After a fall, the skier remains strapped to the board; while it will turn upright quickly, there is always the possibility of drowning.