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- Aircraft (13315 bytes)
15: ... use a spinning rotor (a ''rotary wing'') to provide both lift and thrust. The abbreviation [[VTOL]] i...
18: ...n particular, these aircraft use a relatively low density gas such as [[helium]], [[hydrogen]] or heat...
24: Below, we describe classifications by design, propulsion and usage.
29: ====By design====
33: A first division by design among aircraft is between lighter-than-air, '... - Helicopter (20080 bytes)
1: ...b>fixed-wing aircraft</b>. The word helicopter is derived from the [[Greek language|Greek]] words ''he...
3: ...] Company (USA) [[Robinson R44|R44]], a four seat development of the [[Robinson R22|R22]].]]
5: ...ject only to refuelling facilities and load/altitude limitations, a helicopter can travel to any locat...
9: ...ransportation, casualty evacuation (including [[MEDEVAC]], and [[search and rescue|air/sea/mountain re...
13: ...ry AD]] book in China that described some of the ideas in a rotary wing aircraft.
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