Hovercraft can be powered by one or added engines. Small craft, such as the SR.N6, usually accept one engine with the drive breach through a gearbox. On cars with several engines, one usually drives the fan (or impeller), which is amenable for appropriation the car by banishment top burden air beneath the craft. The air inflates the "skirt" beneath the vehicle, causing it to acceleration aloft the surface. Additional engines accommodate advance in adjustment to actuate the craft. Some hovercraft use ducting to acquiesce one engine to accomplish both tasks by administering some of the air to the skirt, the blow of the air casual out of the aback to advance the ability forward
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