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The US naval jack (2002–2019) being raised on a jackstaff in 2002. A jack staff (also spelled as jackstaff) is a small vertical spar (pole) on the bow of a ship or smaller vessel on which a particular type of flag, known as a jack, is flown. [1]
A flagpole, flagmast, flagstaff, or staff is a pole designed to support a flag. If it is taller than can be easily reached to raise the flag, a cord is used, looping around a pulley at the top of the pole with the ends tied at the bottom. The flag is fixed to one lower end of the cord, and is then raised by pulling on the other end.
Six of the flags (including one for Apollo 13 which was not planted on the Moon) were ordered from a government supply catalog and measured 3 by 5 feet (0.91 by 1.52 m); the last one planted on the Moon was the slightly larger, 6-foot (1.8 m)-wide flag which had hung in the MSC Mission Operations Control Room for most of the Apollo program.
A typical modern application would be Honda motor's use of 5W-20 (and in their newest vehicles, 0W-20) viscosity oil for 12,000 kilometres (7,500 mi). Engine designs are evolving to allow the use of even lower-viscosity oils without the risk of excessive metal-to-metal abrasion, principally in the cam and valve mechanism areas.
Typically the collapsed length of a telescopic cylinder is 20 to 40% of the fully extended length depending on the number of stages. [1] Some pneumatic telescoping units are manufactured with retracted lengths of under 15% of overall extended unit length. [2] This feature is very attractive to machine design engineers when a conventional single ...
Telescoping in mechanics describes the movement of one part sliding out from another, lengthening an object (such as a telescope or the lift arm of an aerial work platform) from its rest state. [1] In modern equipment this can be achieved by a hydraulics , but pulleys are generally used for simpler designs such as extendable ladders and amateur ...
The Cairo Flagpole is the world's tallest flagpole, at 201.952 m (662 ft 7 in) tall. Located in the New Administrative Capital of Egypt, it was erected on the 26 December, 2021. [1] The flagpole was constructed by the Gharably Integrated Engineering Company in Egypt. [1] It weighs 1,040 tons and flies a 60 x 40 m (197 x 131 ft) flag. [2]
The size and color of flag was chosen depending on lighting conditions and distance. The white flag was the most common and was used against dark backgrounds. Against light or varied backgrounds, the red flag was more effective and was also used at sea. [15] The black flag was used against a background of snow. [16]