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📘 A hovercraft is supported by pressure, not wings

Watch a hovercraft settle onto a beach and ask what is actually carrying its weight. It is not floating like a boat, and it is not flying like an airplane. A lift fan pushes air into the space beneath the hull, making the pressure there sli

3
lessons
~15 min
to learn
Adults
level
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What you’ll learn

  1. Lift: turning air into a supportExplain how pressure over a broad cushion balances a hovercraft's weight.Fans supply air to a cushion whose pressure and leakage determine the craft's clearance.
  2. Skirt: the flexible boundaryDescribe why a flexible skirt is essential for maintaining an air cushion over uneven surfaces.The skirt adapts to bumps, controls leakage, and can use peripheral jets to improve lift.
  3. Move and steer: separating lift from thrustDistinguish lift, thrust, drag, and steering in a hovercraft's motion.A cushion reduces contact while propellers and rudders provide the forces for movement and control.

Questions this course answers

What directly supports a hovercraft's weight?

Pressure acting across the broad cushion area creates the upward force.

Why does a hovercraft need a flexible skirt?

The skirt preserves clearance and limits leakage over uneven surfaces.

What is the main job of a propeller or thrust fan?

Thrust is a horizontal force, separate from the lift system.

Why can a hovercraft travel from water onto a beach?

The air cushion supports the hull over several relatively smooth surfaces.

What should you expect if cushion leakage increases without more fan flow?

The lift system must replace escaping air to maintain pressure.

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