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Hydrocopter
A hydrocopter is an amphibious propeller-driven catamaran with a boat-like hull, small wheels and pontoon skis (as in a seaplane). An aircraft engine with a propeller and air rudder powers the vehicle over water, ice, snow and land. Hydrocopters are used in Arctic coastal regions, primarily Sweden and Finland, during "menföre" (Swedish, ''bad going''), or "kelirikko" (Finnish ''broken going'') (see also Russian “ rasputitsa"), when melting ice cannot support ground vehicles and boats are hindered as well. Hydrocopters are often used as a low-cost alternative to hovercraft and helicopters. Hydrocopters are primarily produced in small machine shops or made by hobbyists as hydrocopters have never been mass produced.Kotka Maritime Museum. ''Amfibio 3000 KR-124'' plaque. 2017. Design and manufacturing Hydrocopters are generally smaller vehicles less than 20 ft long and weigh less than 2000 kg. Hydrocopters are powered by a fixed bladed aircraft propeller, the same as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aerosani
Aerosani (both singular and plural; russian: aэросани, literally aerosled) is a type of propeller-driven snowmobile, running on skis, used for communications, mail deliveries, medical aid, emergency recovery and border patrolling in northern Russia, as well as for recreation. Aerosani were used by the Soviet Red Army during the Winter War and World War II. The first aerosani may have been built in 1903-05 by Sergei Nezhdanovsky. In 1909–10, young Igor Sikorsky tested a self-designed aerosani, before he built multi-engine airplanes and helicopters. They were very light plywood vehicles on skis, propelled by otherwise-disused vintage aircraft engines and propellers. Military usage Military use of the aerosani goes back to at least the 1910s. During World War I, aerosani were used for reconnaissance, communicating, and light raiding in northern areas. During the 1939–40 Winter War against Finland some were equipped with a machine gun ring mount on the roof. They could ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Airboat
An airboat (also known as a planeboat, swamp boat, bayou boat, or fanboat) is a flat-bottomed watercraft propelled by an aircraft-type propeller and powered by either an aircraft or automotive engine. In early aviation history the term ''airboat'' was applied to seaplanes or flying boats, i.e. aircraft capable of taking off and landing on water surfaces. Early airboats were known as "hydroglisseurs" (airboat in French, "water slider"), hydroplanes, hydrofoils, or other names. See e.g. ''Flying'Volume 4(1915-1916) and Cercle du Mononautisme Classiqu (in French). They are commonly used for fishing, bowfishing, hunting, and ecotourism. Airboats are a common means of transportation in marshy and/or shallow areas where a standard inboard or outboard engine with a submerged propeller would be impractical, most notably in the Florida Everglades but also in the Kissimmee and St. Johns rivers, and the Mekong River and Delta, as well as the Louisiana bayous and Mesopotamian Marshes. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Air Boat
An airboat (also known as a planeboat, swamp boat, bayou boat, or fanboat) is a flat-bottomed watercraft propelled by an aircraft-type Propeller (aircraft), propeller and powered by either an aircraft or automotive engine. In early aviation history the term ''airboat'' was applied to seaplanes or flying boats, i.e. aircraft capable of taking off and landing on water surfaces. Early airboats were known as "hydroglisseurs" (airboat in French language, French, "water slider"), hydroplanes, hydrofoils, or other names. See e.g. ''Flying'Volume 4(1915-1916) and Cercle du Mononautisme Classiqu (in French). They are commonly used for fishing, bowfishing, hunting, and ecotourism. Airboats are a common means of transportation in marshy and/or shallow areas where a standard inboard or outboard engine with a submerged propeller would be impractical, most notably in the Florida Everglades but also in the Kissimmee River, Kissimmee and St. Johns River, St. Johns rivers, and the Mekong River a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Finnish Border Guard
The Finnish Border Guard (; ) is the agency responsible for enforcing the security of Finland's borders. It is a military organisation, subordinate to the Ministry of the Interior in administrative issues and to the President of Finland in issues pertaining to his authority as Commander-in-Chief (e.g. officer promotions). The agency has police and investigative powers in immigration matters and can independently investigate immigration violations. The Border Guard has search and rescue (SAR) duties, both maritime and inland. Missions inland are often carried out in co-operation with local fire and rescue departments or other authorities. The Finnish Border Guard consists of 3,800 active duty personnel. Upon mobilization, it would be wholly or partly incorporated into the Finnish Defence Forces and its strength increased with reservists who have served their conscription in the branch. The mobilized strength of the Finnish Border Guard is 12,600 servicemen. The Finnish-Russian b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emergency Position-indicating Radiobeacon Station
An Emergency Position-Indicating Radio Beacon (EPIRB) is a type of emergency locator beacon for commercial and recreational boats, a portable, battery-powered radio transmitter used in emergencies to locate boaters in distress and in need of immediate rescue. In the event of an emergency, such as a ship sinking or medical emergency onboard, the transmitter is activated and begins transmitting a continuous 406 MHz distress radio signal, which is used by search-and-rescue teams to quickly locate the emergency and render aid. The signal is detected by satellites operated by an international consortium of rescue services, COSPAS-SARSAT, which can detect emergency beacons anywhere on Earth transmitting on the distress frequency of 406 MHz. The satellites calculate the position or utilize the GPS coordinates of the beacon and quickly passes the information to the appropriate local first responder organization, which performs the search and rescue. As Search and Rescue approach the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Very High Frequency
Very high frequency (VHF) is the ITU designation for the range of radio frequency electromagnetic waves ( radio waves) from 30 to 300 megahertz (MHz), with corresponding wavelengths of ten meters to one meter. Frequencies immediately below VHF are denoted high frequency (HF), and the next higher frequencies are known as ultra high frequency (UHF). VHF radio waves propagate mainly by line-of-sight, so they are blocked by hills and mountains, although due to refraction they can travel somewhat beyond the visual horizon out to about 160 km (100 miles). Common uses for radio waves in the VHF band are Digital Audio Broadcasting (DAB) and FM radio broadcasting, television broadcasting, two-way land mobile radio systems (emergency, business, private use and military), long range data communication up to several tens of kilometers with radio modems, amateur radio, and marine communications. Air traffic control communications and air navigation systems (e.g. VOR and ILS) wo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Global Positioning System
The Global Positioning System (GPS), originally Navstar GPS, is a satellite-based radionavigation system owned by the United States government and operated by the United States Space Force. It is one of the global navigation satellite systems (GNSS) that provides geolocation and time information to a GPS receiver anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites. It does not require the user to transmit any data, and operates independently of any telephonic or Internet reception, though these technologies can enhance the usefulness of the GPS positioning information. It provides critical positioning capabilities to military, civil, and commercial users around the world. Although the United States government created, controls and maintains the GPS system, it is freely accessible to anyone with a GPS receiver. The GPS project was started by the U.S. Department of Defense in 1973. The first prototype spacecraft was lau ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radar
Radar is a detection system that uses radio waves to determine the distance (''ranging''), angle, and radial velocity of objects relative to the site. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. A radar system consists of a transmitter producing electromagnetic waves in the radio or microwaves domain, a transmitting antenna, a receiving antenna (often the same antenna is used for transmitting and receiving) and a receiver and processor to determine properties of the objects. Radio waves (pulsed or continuous) from the transmitter reflect off the objects and return to the receiver, giving information about the objects' locations and speeds. Radar was developed secretly for military use by several countries in the period before and during World War II. A key development was the cavity magnetron in the United Kingdom, which allowed the creation of relatively small systems with sub-meter resolution. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Capsizing
Capsizing or keeling over occurs when a boat or ship is rolled on its side or further by wave action, instability or wind force beyond the angle of positive static stability or it is upside down in the water. The act of recovering a vessel from a capsize is called righting. Capsize may result from broaching, , loss of stability due to cargo shifting or flooding, or in high speed boats, from turning too fast. If a capsized vessel has enough flotation to prevent sinking, it may recover on its own in changing conditions or through mechanical work if it is not stable inverted. Vessels of this design are called self-righting. Small vessels In dinghy sailing, a practical distinction can be made between being knocked down (to 90 degrees; on its beam-ends, figuratively) which is called a capsize, and being inverted, which is called being turtled. Small dinghies frequently capsize in the normal course of use and can usually be recovered by the crew. Some types of dinghy are occasi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kuopio Vene 7
Kuopio (, ) is a Finnish city and municipality located in the region of Northern Savonia. It has a population of , which makes it the most populous municipality in Finland. Along with Joensuu, Kuopio is one of the major urban, economic, and cultural hubs of Eastern Finland. At the end of 2018, its urban area had a population of 89,307. Kuopio has a total area of , of which is water and half is forest. Though the city's population is a spread-out , the city's urban areas are populated comparably densely (urban area: 1,618 /km²), making Kuopio Finland's second-most densely populated city. Kuopio is known nationwide as one of the most important study cities and centers of attraction and growth, but on the other hand, the history of Kuopio has been characterized by several municipality mergers since 1969, as a result of which Kuopio now includes much countryside; Kuopio's population surpassed 100,000 when the town of Nilsiä joined the city at the beginning of 2013, and when Maa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Catamaran
A Formula 16 beachable catamaran Powered catamaran passenger ferry at Salem, Massachusetts, United States A catamaran () (informally, a "cat") is a multi-hulled watercraft featuring two parallel hulls of equal size. It is a geometry-stabilized craft, deriving its stability from its wide beam, rather than from a ballasted keel as with a monohull boat. Catamarans typically have less hull volume, smaller displacement, and shallower draft (draught) than monohulls of comparable length. The two hulls combined also often have a smaller hydrodynamic resistance than comparable monohulls, requiring less propulsive power from either sails or motors. The catamaran's wider stance on the water can reduce both heeling and wave-induced motion, as compared with a monohull, and can give reduced wakes. Catamarans were invented by the Austronesian peoples which enabled their expansion to the islands of the Indian and Pacific Oceans. Catamarans range in size from small sailing or rowing ve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
