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UC1 Freya
''Freya'' or UC1 ''Freya'' (in Danish: ''Freja'') was the first private Danish submarine, and thus first amateur electric sub in Denmark. It was built by Peter Madsen and Claus Nørregaard in 2001–2002, as a demonstrator to try submarine technology. Having made over 500 dives, it was decommissioned, as it was not designed for a long service life. It was decommissioned in 2006 after ''UC2 Kraka'' had been worked up. The submarine was then docked and allowed to decay. Final decontamination was done, and it was towed out to sea by '' UC3 Nautilus'', in August 2008, and sunk as an artificial reef near Copenhagen. Peter Madsen, email notice"[PSUBS-MAILIST] UC3 Nautilus at sea with UC1 Freya..." 10 Aug 2008 ''Freya'' is named after the Norse goddess of fertility and love. Construction The sub was built at Peter Madsen's workshop in Farum, Denmark. ''Freya'' was completed in 2002. It was built with only an electric drive, a 3.1-kW Sauer-Danfoss 24V DC electric motor. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flag Of Denmark
The national flag of Denmark ( da, Dannebrog, ) is red with a white Nordic cross, which means that the cross extends to the edges of the flag and the vertical part of the cross is shifted to the hoist side. A banner with a white-on-red cross is attested as having been used by the kings of Denmark since the 14th century."Dannebrog" by Hans Christian Bjerg, p.12, . An origin legend with considerable impact on Danish national historiography connects the introduction of the flag to the Battle of Lindanise of 1219. The elongated Nordic cross reflects its use as a maritime flag in the 18th century. The flag became popular as a national flag in the early 16th century. Its private use was outlawed in 1834 but again permitted by a regulation of 1854. The flag holds the world record of being the oldest continuously used national flag. Description In 1748, a regulation defined the correct lengths of the two last fields in the flag as . In May 1893 a new regulation to all chiefs of polic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electric Motor
An electric motor is an Electric machine, electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a Electromagnetic coil, wire winding to generate force in the form of torque applied on the motor's shaft. An electric generator is mechanically identical to an electric motor, but operates with a reversed flow of power, converting mechanical energy into electrical energy. Electric motors can be powered by direct current (DC) sources, such as from batteries, or rectifiers, or by alternating current (AC) sources, such as a power grid, Inverter (electrical), inverters or electrical generators. Electric motors may be classified by considerations such as power source type, construction, application and type of motion output. They can be powered by AC or DC, be Brushed motor, brushed or Brushless motor, brushless, single-phase, Two-phase electric power, two-p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Midget Submarines
A midget submarine (also called a mini submarine) is any submarine under 150 tons, typically operated by a crew of one or two but sometimes up to six or nine, with little or no on-board living accommodation. They normally work with mother ships, from which they are launched and recovered and which provide living accommodation for the crew and support staff. Both military and civilian midget submarines have been built. Military types work with surface ships and other submarines as mother ships. Civilian and non-combatant military types are generally called submersibles and normally work with surface ships. Most early submarines would now be considered midget submarines, such as the United States Navy's and the British Royal Navy's (both named for the same designer). Military submarines Uses Midget submarines are best known for harbor penetration, although only two World War II boats, the British X-craft and the unsuccessful Welman submarine, were specifically designed with t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Periscope
A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position. In its simplest form, it consists of an outer case with mirrors at each end set parallel to each other at a 45° angle. This form of periscope, with the addition of two simple lenses, served for observation purposes in the trenches during World War I. Military personnel also use periscopes in some gun turrets and in armoured vehicles. More complex periscopes using prisms or advanced fiber optics instead of mirrors and providing magnification operate on submarines and in various fields of science. The overall design of the classical submarine periscope is very simple: two telescopes pointed into each other. If the two telescopes have different individual magnification, the difference between them causes an overall magnification or reduction. Early examples Johannes Hevelius described an early ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Keel
The keel is the bottom-most longitudinal structural element on a vessel. On some sailboats, it may have a hydrodynamic and counterbalancing purpose, as well. As the laying down of the keel is the initial step in the construction of a ship, in British and American shipbuilding traditions the construction is dated from this event. Etymology The word "keel" comes from Old English , Old Norse , = "ship" or "keel". It has the distinction of being regarded by some scholars as the first word in the English language recorded in writing, having been recorded by Gildas in his 6th century Latin work ''De Excidio et Conquestu Britanniae'', under the spelling ''cyulae'' (he was referring to the three ships that the Saxons first arrived in). is the Latin word for "keel" and is the origin of the term careen (to clean a keel and the hull in general, often by rolling the ship on its side). An example of this use is Careening Cove, a suburb of Sydney, Australia, where careening was carried out ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crush Depth
Depth ratings are primary design parameters and measures of a submarine's ability to operate underwater. The depths to which submarines can dive are limited by the strengths of their submarine hull, hulls. Ratings The hull of a submarine must be able to withstand the forces created by the outside water pressure being greater than the inside air pressure. The outside water pressure increases with depth and so the stresses on the hull also increase with depth. Each 10 metres (33 feet) of depth puts another atmosphere (1 bar, 14.7 psi, 101 kPa) of pressure on the hull, so at 300 metres (1,000 feet), the hull is withstanding thirty atmospheres (30 bar, 441 psi, 3,000 kPa) of water pressure. Test depth The maximum depth at which a submarine is permitted to operate under normal peacetime circumstances, and is tested during sea trials. The test depth is set at two-thirds (0.66) of the design depth for United States Navy submarines, while the Royal Navy sets test depth at 4/7 (0.57) t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Forklift
A forklift (also called lift truck, jitney, hi-lo, fork truck, fork hoist, and forklift truck) is a powered industrial truck used to lift and move materials over short distances. The forklift was developed in the early 20th century by various companies, including Clark Material Handling Company, Clark, which made Transmission (mechanics), transmissions, and Yale Materials Handling Corporation, Yale & Towne Manufacturing, which made Hoist (device), hoists. Since World War II, the use and development of the forklift truck have greatly expanded worldwide. Forklifts have become an indispensable piece of equipment in manufacturing and warehousing. In 2013, the top 20 manufacturers worldwide posted sales of $30.4 billion, with 944,405 machines sold. History The middle nineteenth century through the early 20th century saw the developments that led to today's modern forklifts. The forerunners of the modern forklift were manually-powered hoists that were used to lift loads. In 1906, th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Farum
Farum is a town on the northeast of the island of Zealand in eastern Denmark, 20 km northwest of Copenhagen. The town has a population of 20,312 (1 January 2022).BY3: Population 1. January by rural and urban areas, area and population density The Mobile Statbank from The town is part of . Until 2006, it constituted |
Peter Madsen (inventor)
Peter Langkjær Madsen (; born 12 January 1971) is a Danish convicted murderer and former entrepreneur. In April 2018, he was convicted of the 2017 murder of Swedish journalist Kim Wall on board his submarine, '' UC3 Nautilus'', and sentenced to life imprisonment. Biography Madsen was born in 1971 to Annie and Carl Madsen. He spent his early life in Sæby and Høng (both in Kalundborg Municipality), Denmark. Annie was more than 30 years younger than Carl and had three other boys from two previous men. Carl was allegedly abusive toward his three stepsons. Annie left when Peter was six, taking the children with her. After a couple of years, Madsen returned to his father, with whom he shared an interest in rockets. While attending primary and secondary school in Høng, Madsen developed an interest in rocket fuel with the help of chemistry and physics teacher Johannes Fischer. He developed his first large rocket at Høng and launched it on 3 March 1986. It was one meter tall, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freya
In Norse paganism, Freyja (Old Norse "(the) Lady") is a goddess associated with love, beauty, fertility, sex, war, gold, and seiðr (magic for seeing and influencing the future). Freyja is the owner of the necklace Brísingamen, rides a chariot pulled by two cats, is accompanied by the boar Hildisvíni, and possesses a cloak of falcon feathers. By her husband Óðr, she is the mother of two daughters, Hnoss and Gersemi. Along with her twin brother Freyr, her father Njörðr, and her mother ( Njörðr's sister, unnamed in sources), she is a member of the Vanir. Stemming from Old Norse ''Freyja'', modern forms of the name include Freya, Freyia, and Freja. Freyja rules over her heavenly field, Fólkvangr, where she receives half of those who die in battle. The other half go to the god Odin's hall, Valhalla. Within Fólkvangr lies her hall, Sessrúmnir. Freyja assists other deities by allowing them to use her feathered cloak, is invoked in matters of fertility and love, and is fre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
