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- Aircraft (13315 bytes)
9: ==Categories and classification==
11: Aircraft fall into two broad categories:
15: ...t must descend in relation to the air (but not necessarily in relation to the ground). Helicopters and...
18: ...er as ships float on the water. In particular, these aircraft use a relatively low density gas such a...
24: Below, we describe classifications by design, propulsion and usage.
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