What primarily determines the lift of a hovercraft?

The lift of a hovercraft is primarily determined by cushion pressure. This pressure is created by a large fan or multiple fans that blow air underneath the hovercraft, forming a cushion of air that lifts the vehicle off the ground. This cushion effectively reduces friction with the surface below and allows for smooth movement over land and water.

The amount of lift generated is influenced by the pressure of the air trapped under the hovercraft; greater cushion pressure results in higher lift, allowing the craft to hover more effectively. The design and efficiency of the hovercraft's air delivery system play a crucial role in maintaining and controlling this pressure.

While factors such as propeller speed, body shape, and weight of the craft can affect how the hovercraft operates and its overall efficiency, they do not primarily determine the lift. Instead, lift is fundamentally reliant on the cushion of air created by the pressure difference below the craft.