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Angle of attack of an airfoil. In fluid dynamics, angle of attack (AOA, α, or ) is the angle between a reference line on a body (often the chord line of an airfoil) and the vector representing the relative motion between the body and the fluid through which it is moving. [1]
Nautical charts must be labeled with navigational and depth information. There are a few commercial software packages that do automatic label placement for any kind of map or chart. Modern systems render electronic charts consistent with the IHO S-52 specification, issued by the International Hydrographic Organization (IHO). [7]
The electronic type with audio needs a power source to be operative during the flight. The instrument is of little interest during launching and landing, with the exception of aerotow, where the pilot will usually want to avoid releasing in sink. The vertical speed indicator from a Robinson R22.
An electronic symbol is a pictogram used to represent various electrical and electronic devices or functions, such as wires, batteries, resistors, and transistors, in a schematic diagram of an electrical or electronic circuit. These symbols are largely standardized internationally today, but may vary from country to country, or engineering ...
Two men using the hanky code. In the 1970s, the modern handkerchief (or hanky) code emerged in the form of bandanas, worn in back pockets, in colors that signaled sexual interests, fetishes, and if the wearer was a "top" or "bottom". [85] [86] It was popular among the gay leather community of the United States [87] and the cruising scene more ...
Since the early 1990s, many fuel gauges have included an icon with a fuel pump and an arrow, indicating the side of the vehicle on which the fuel filler is located. [ 5 ] [ 6 ] The use of the icon and arrow was invented in 1986 by Jim Moylan, a designer for Ford Motor Company .
"Color Change When Wet" is now the most common version of wetness indicator in baby diapers, consisting of a yellow stripe that goes from the front to the back of the diaper. The stripe turns blue after a minute or two as a reaction to urine. During the transition when the wetness indicator is reacting to the baby's urine; the stripe fades or ...
NATO Joint Military Symbology is the NATO standard for military map symbols.Originally published in 1986 as Allied Procedural Publication 6 (APP-6), NATO Military Symbols for Land Based Systems, the standard has evolved over the years and is currently in its fifth version (APP-6D).