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  1. 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, '...
  2. 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: ...any location, and land anywhere with a clearing a rotor disk and a half in diameter.
    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.
  3. Kite flying (5612 bytes)
    6: ... the string through a solution of ground glass powder and glue. The resulting strings are abrasive and...
    8: ... Lower cost kites in quantity production may be made from printed polyester, which will have longer us...
    11: ...cs such as silk for the sails. Modern kites are made with synthetic materials: nylon or more exotic fa...
    13: ... aerodynamic forms, to modern sparless inflatable designs.:
    19: ...ind. In recent years, multi-line kite flying has developed into a [[sport kite|sport]], with competit...
  4. Hydrogen (20221 bytes)
    3: <table border="1" cellpadding="2" cellspacing="0" align="right...
    5: <table align="center" border="0">
    22: <td>[[Density]], [[Mohs hardness scale|Hardness]] </td>...
    34: <td>[[van der Waals radius]] </td><td>...
    40: <td>[[Oxidation state]]s ([[Oxide]]) </td><td>1 ([[amphoteric]])</t...
  5. Flagellum (8951 bytes)
    4: ...milar, but are different in many details and considered non-homologous. [[Eukaryote|Eukaryotic]] flag...
    8: ...ates with [[peptidoglycan]] layer, M ring is imbedded in the [[plasma membrane]], and the S ring is di...
    10: ...s the membrane, and is turned in the process. The rotor by itself can operate at 6,000 to 17,000 [[rpm]],...
    18: ...te is random. The length of the run state is extended when the bacteria moves through a favorable grad...
    24: ... (e.g., [[Carl Woese|Woese]]), or a just a highly-derived bacterium with heavy adaptation to [[extremo...
  6. Centrifuge (2358 bytes)
    5: == History and predecessors ==
    7: ... (1707-1751) invented a whirling arm apparatus to determine drag.
    9: ...ion rates for [[macromolecule]]s, allowed for the determination of their approximate
    14: ...wer rate than an ultracentrifuge, and have larger rotors, and be optimized for holding large quantities o...
    22: ... acceleration to match soil stresses in a scale model to those found in reality.
  7. Wind power (27669 bytes)
    1: ... deals mainly with the intricacies of large-scale deployment of wind turbines to generate [[electric p...
    3: ...wind power over the United States. This type of undetailed map is most useful for scouting for offshor...
    9: ...st of this wind energy can be found at high altitudes where continuous wind speeds of over 160 km/h (1...
    11: ...are extremely complicated and relatively little understood, the basics of its origins are relatively s...
    17: ...speed (cubed), the swept area (linearly), and the density of the air (linearly).
  8. Steam engine (17867 bytes)
    3: ...eds a boiler to boil [[water]] to produce steam under pressure. Any [[heat]] source can be used, but t...
    6: ... machine sutherland steam fire engine. Image provided by [http://classroomclipart.com Classroom Clip A...
    7: The first steam device, the [[aeolipile| ''aeolipile'']], was invent...
    9: ... same period. Early industrial steam engines were designed by [[Thomas Savery]] ([[1698]]), [[Thomas N...
    11: Early engines worked by the [[vacuum]] of condensing steam, whereas later types (such as [[steam ...

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