How does a hydrofoil work?
Without getting too deep into the physics of it, a hydrofoil is shaped in such a way that water rushing through it gives it upward lift.
While this looks crazy and futuristic, it’s the same technology that gives aeroplanes lift.
A plane’s wings are curved and tilted so that air passes over it faster than under it. This causes a decrease in pressure of the air above the wing, and, as a result of the pressure difference, upward lift is generated. The plane can take off or move higher in the air.
This relies on Bernoulli’s principle in fluid dynamics, which states this counterintuitive pressure/speed relationship.
In a hydrofoil, the same thing is happening, only in water.
The hydrofoil cuts the water and forces water to flow faster over the foil than under it, causing the pressure change that gives your boat or board lift out of the water.
The faster you go, the more lift the foil generates.
For foil kiters, this translates to a water start where you begin to levitate as you gain speed and the foil works its lift magic. It’s a pretty crazy sensation. Some even say it feels like flying.