[Grammar] a simple aircraft that you hang under and control by moving your body

[kadioguy]

In the Macmillan English Dictionary, it says:

hang-glider n.
a simple aircraft with no engine that you hang under and control by moving your body
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Does it mean this?
you hang under the aircraft and you control the aircraft by moving your body.

Thanks!

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[Phaedrus]

Does it mean this?
you hang under the aircraft and you control the aircraft by moving your body.

Yes. It means you hang under [the aircraft with no engine] and you control [the aircraft with no engine] by moving your body. The relative clause modifies the noun phrase "aircraft with no engine" as a whole. It doesn't just modify "aircraft."

It's true that the relative clause can be perversely interpreted as modifying "engine": it has no engine that is hung under and controlled by moving your body. But that interpretation is by no means necessitated by the definition as it is written.

It's possible to rephrase the prepositional phrase modifier as a relative clause of its own, and to use three conjoined relative clauses: "a simple aircraft which has no engine, which you hang under, and which you control by moving your body."