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  2. Solar sail - Wikipedia

    en.wikipedia.org/wiki/Solar_sail

    Website with technical pdf-files about solar-sailing, including NASA report and lectures at Aerospace Engineering School of Rome University; Advanced Solar- and Laser-pushed Lightsail Concepts; Andrews, D. G. (2003). "Interstellar Transportation using Today's Physics" (PDF). AIAA Paper 2003-4691. Archived from the original (PDF) on 2006-03-11.

  3. Forces on sails - Wikipedia

    en.wikipedia.org/wiki/Forces_on_sails

    In the left-hand diagram (broad reach), the boat is on a point of sail, where the sail can no longer be aligned into the apparent wind to create an optimum angle of attack. Instead, the sail is in a stalled condition, creating about 80% of the lift as in the upwind examples and drag has doubled.

  4. Cathode-ray tube - Wikipedia

    en.wikipedia.org/wiki/Cathode-ray_tube

    Normally, only a part of the cathode emits electrons unless the CRT displays images with parts that are at full image brightness; only the parts at full brightness cause all of the cathode to emit electrons. The area of the cathode that emits electrons grows from the center outwards as brightness increases, so cathode wear may be uneven.

  5. List of aviation, avionics, aerospace and aeronautical ...

    en.wikipedia.org/wiki/List_of_aviation,_avionics...

    Direct noise canceling DO design organization DOA design organization approval: EASA: DODAR diagnose, options, decide, act/assign, review DOM design organization manual DOW dry operational weight DP Departure Procedures DPU Display Processor Unit DR dead reckoning: DRMC Direct Reading Magnetic Compass DSP Digital signal processing: DTO

  6. Marine propulsion - Wikipedia

    en.wikipedia.org/wiki/Marine_propulsion

    The size of the different types of engines is an important factor in selecting what will be installed in a new ship. Slow speed two-stroke engines are much taller, but the footprint required is smaller than that needed for equivalently rated four-stroke medium speed diesel engines.

  7. Laser beam profiler - Wikipedia

    en.wikipedia.org/wiki/Laser_beam_profiler

    Camera techniques: These include the direct illumination of a camera sensor. The maximum spot size that will fit onto a CCD sensor is on the order of 10 mm. Alternatively, illuminating a flat diffuse surface with the laser and imaging the light onto a CCD with a lens allows profiling of larger-diameter beams. Viewing lasers off diffuse surfaces ...

  8. Interstellar travel - Wikipedia

    en.wikipedia.org/wiki/Interstellar_travel

    Light is reflected from the large primary sail to the secondary sail, which is used to decelerate the secondary sail and the spacecraft payload. [60] In 2002, Geoffrey A. Landis of NASA 's Glen Research center also proposed a laser-powered, propulsion, sail ship that would host a diamond sail (of a few nanometers thick) powered with the use of ...

  9. Speed of light - Wikipedia

    en.wikipedia.org/wiki/Speed_of_Light

    This effect results from the vector addition of the velocity of light arriving from a distant source (such as a star) and the velocity of its observer (see diagram on the right). A moving observer thus sees the light coming from a slightly different direction and consequently sees the source at a position shifted from its original position.