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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, '... - Cat (30067 bytes)
3: ...e:Cat_outside.jpg|200px|A cat in the botanical gardens in Buenos Aires, Argentina.]] | caption = [[:Im...
18: ...imal bears the closest resemblance to the "ideal" definition of the breed (see [[selective breeding]])...
23: ...n/a/spay_neuter.htm 1] [[Feral]] cats living in modern urban environments often live 2 years or less.
25: ...ars can point backwards as well as forwards and sideways.
27: ...more than most animals, especially as they grow older. Daily durations of sleep are various, usually 1... - Jet engine (22370 bytes)
1: ... the front of the engine (left of photo) prevents debris - or people - from being pulled into the engi...
4: ...ally ignited by flame in the eddy of a [[flame holder]], and burned as an atomized mixture. The [[comb...
6: ...(especially [[supersonic]] speeds) and high altitudes. On slower aircraft and those required to fly sh...
10: ...of peripheral fitted is dependent on the aircraft design application.
15: ...''', or simply '''jet''') engine, as subsequently developed, would become almost as revolutionary to a...
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