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  1. Aircraft (13315 bytes)
    15: ...ground). Helicopters and autogyros use a spinning rotor (a ''rotary wing'') to provide both lift and thru...
    37: ...dirigible balloons) such as [[blimp]]s (that have non-rigid construction) and rigid airships that have...
    41: ...lift, the aircraft is kept in the air by wings or rotors (see [[aerodynamics]]). With engine lift, the ai...
    45: ...rofiting from airflow patterns determined by [[Bernoulli's equation]] and, to some extent, the [[Coand...
    49: ...urfaces are placed forward of the wings, near the nose of the aircraft. Canards are becoming more comm...
  2. Helicopter (20080 bytes)
    1: ...] and propelled by one or more large horizontal [[rotor]]s ([[propeller]]s). Helicopters are classified ...
    5: ...any location, and land anywhere with a clearing a rotor disk and a half in diameter.
    15: ...rated by [[Ra?teras de Pescara]] [[1916]] in [[Buenos Aires]], [[Argentina]]. The [[Bell 47]] designe...
    19: ... the wings themselves are moved. The helicopter's rotor can simply be regarded as rotating wings.
    23: ...r, the helicopter will not rotate around the main rotor shaft.
  3. Kite flying (5612 bytes)
    6: ... the other kite down. In [[Afghanistan]] this is known as "Gudiparan Bazi." Some kite "fighters" pass ...
    10: ==Technology==
    23: ...giros. The principle is that in a proper wind the rotors spin and create lift. This type of kite requires...
    45: *[[rotorkite]]
  4. Hydrogen (20221 bytes)
    18: ... series]] </td><td>[[nonmetal]]s</td></tr>
    104: ...perature and pressure|STP]] are used except where noted.</font></th>
    108: ...ure and pressure]] it is a colorless, odorless, [[non-metal]]lic, [[univalent]], highly [[combustion|f...
    110: ...on. One of them involves use of green [[algae]]. Another promising method involves the conversion of b...
    112: == Notable characteristics ==
  5. Flagellum (8951 bytes)
    4: ... but are different in many details and considered non-homologous. [[Eukaryote|Eukaryotic]] flagella -...
    8: ...gellin]] and is a hollow tube [[1 E -8 m|20]] [[nanometer]]s thick. It is helical, and has a sharp ben...
    10: ...s the membrane, and is turned in the process. The rotor by itself can operate at 6,000 to 17,000 [[rpm]],...
    14: ...different numbers and arrangements of flagella. Monotrichous bacteria have a single flagellum. Lophotr...
    18: ...of rotation is briefly reversed, causing what is known as a "tumble", and results in reorientation of ...
  6. Centrifuge (2358 bytes)
    10: ...[molecular weight]]s. Svedberg won the [[1926]] [[Nobel Prize in Chemistry]] for his invention.
    14: ...wer rate than an ultracentrifuge, and have larger rotors, and be optimized for holding large quantities o...
    26: ... who have experienced an ultracentrifuge losing a rotor compare the experience to having a [[bomb]] explo...
    28: ... centrifuge and create an unpleasant sound as the rotor and shaft scrape the casing.
  7. Wind power (27669 bytes)
    11: ...imple. The earth is not heated evenly by the sun. Not only do the poles receive less energy from the s...
    17: ...ch converts some of that power into torque on the rotor. The amount of power transferred depends on the ...
    19: ...8 m/s breeze blowing through a 100 meter diameter rotor would move about 76,000 kilograms of air per seco...
    22: rotor would be about 2.5 megawatts.
    28: ...ies, and an average value for a given location is not in itself a clear indication of the amount of en...
  8. Steam engine (17867 bytes)
    22: ==Technology==
    26: ...lly require a tall smokestack to provide a draft, not having a fan to provide a forced draft. In a ste...
    28: ...ere is not a great amount of water in the boiler, nor are there large mechanical elements subject to f...
    30: ...rced-draft, or "pressure-fired" boilers. This technology, equivalent to supercharging for an internal ...
    36: ...nser. Most reciprocating engines now use this technology. Power is removed by a sliding rod, sealed ag...

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