The skirt is a moving seal, not a rigid wall
A hovercraft needs a small gap between its body and the ground so it can pass over uneven surfaces. The skirt hangs around the underside to help contain the pressurized air beneath the craft, but it cannot seal that gap like a fixed gasket: it must bend whenever the surface rises, drops, or changes shape.
That motion concentrates stress near the skirt’s lower edge. As the craft moves, the edge brushes the surface and flexes repeatedly; stones, debris, and abrupt bumps can add cuts or punctures. The damage is therefore not simply a matter of weak rubber. The skirt is doing its job in a place where contact and movement are unavoidable.
Why the skirt is made in pieces
A continuous sheet would be difficult to keep flexible across the whole perimeter and awkward to repair after a local tear. Replaceable sections let a crew change the worn or damaged area instead of discarding the entire skirt. The joins also allow neighboring parts to move as the craft rides over irregular ground.
There is a practical tradeoff: the skirt must be supple enough to follow the terrain, yet durable enough to withstand repeated rubbing and bending. Making it stiffer could resist some wear, but would make it less able to adapt to bumps; making it more flexible helps it conform, while leaving it vulnerable to abrasion. So the replaceable sections are not just a maintenance convenience—they are part of how a hovercraft keeps its air cushion usable while its edge meets the real surface.
