How does the design of a hydrofoil affect lift?

The design of a hydrofoil is specifically shaped to create a difference in pressure between its top and bottom surfaces as it moves through water. When water flows over the curved top surface of the hydrofoil, it travels faster than the water flowing underneath, which is typically flatter. This difference in speed results in lower pressure on the top surface compared to the higher pressure on the bottom surface.

This pressure differential is the key factor that generates lift. The greater the difference in pressure, the more lift produced, allowing the hydrofoil to rise and reduce drag on the object it is attached to, such as a boat or an underwater craft. This lift is crucial for maintaining stability and improving efficiency in waterborne vehicles. Hence, the correct answer indicates that the hydrofoil generates lower pressure on the top surface, which facilitates lift.