Show Notes for July 17, 2013

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  • Boats and planes
    • How an Airplane Wing REALLY Generates Lift
    • Knot (unit)
      • "is a unit of speed equal to one nautical mile (1.852 km) per hour, approximately 1.151 mph"
      • "Until the mid-19th century vessel speed at sea was measured using a chip log. This consisted of a wooden panel, attached by line to a reel, and weighted on one edge to float perpendicularly to the water surface and thus present substantial resistance to the water moving around it. The chip log was "cast" over the stern of the moving vessel and the line allowed to pay out.[4] Knots placed at a distance of 47 feet 3 inches (14.4018 m) passed through a sailor's fingers, while another sailor used a 30-second sand-glass (28-second sand-glass is the currently-accepted timing) to time the operation.[5] The knot count would be reported and used in the sailing master's dead reckoning and navigation. This method gives a value for the knot of 20.25 in/s, or 1.85166 km/h. The difference from the modern definition is less than 0.02%."
    • Centreboard
      • "used to provide lift to counter the lateral force from the sails"
      • "required for sailboats to move in directions other than downwind"
    • Ford Aerospace
      • "was the aerospace and defense business of Ford Motor Company"
      • "1990 Ford Aerospace sold to Loral Corporation"
    • Airbus A380 maximum take-off weight:
      • wing design: 650 tonne
      • A380-800: 562,000 kg
      • A380F (freight) : 590,000 kg
  • Wings
    • AC72
      • "wing sail catamaran box rule, governing the construction and operation of the yachts to be used in the 2013 Louis Vuitton Cup selection series and the 2013 America's Cup"
      • " This new and revolutionary design is extremely expensive and has allowed the development of foils which lift the hull out of the water in some conditions leading to extreme boat speeds."
    • A foil "is a solid object with a shape such that when placed in a moving fluid at a suitable angle of attack the lift (force generated perpendicular to the fluid flow) is substantially larger than the drag (force generated parallel the fluid flow)."
    • Apparent wind
      • "experienced by an observer in motion"
      • "In sailing, the apparent wind is the actual flow of air acting upon a sail"
  • Permeable pavers
    • from Calstone: "help the environment by protecting the quality of our water supplies. They reduce the amount of stormwater runoff entering our natural waterways carrying with it contaminants and pollutants. The water can naturally drain into the surface through the spaces in the pavers. Permeable pavers also will help with erosion control, and flooding issues"
    • from Belgard: "environmental stewardship without compromising beauty and style"
  • Incendie à la Maison des Cèdres à Lausanne
  • Elimination communication
    • "a practice in which a caregiver uses timing, signals, cues, and intuition to address an infant's need to eliminate waste"
    • "Anecdotal evidence from parents suggest that EC is not as convenient as conventional diapering" ;)
  • Optical coherence tomography
    • "captures micrometer-resolution, three-dimensional images from within biological tissue"
    • applications in "ophthalmology where it can be used to obtain detailed images from within the retina"

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