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Nederlandse Helikopter Industrie
The Nederlandse Helikopter Industrie (NHI) was a Dutch helicopter manufacturer. Early history The company was founded in 1955 as a commercial successor of the ''Stichting voor de Ontwikkeling en Bouw van een Experimenteel Hefschroefvliegtuig'' (SOBEH - the Foundation for Development and Manufacturing of an Experimental Helicopter). From 1951 on, SOBEH developed and built two helicopters, the H-1 (1954) and H-2 (1955). After having met its goal of developing a helicopter, SOBEH ceased activities. Further development and serial production were granted to the newly formed NHI. This was a joint venture between aircraft manufacturer Aviolanda and truck company Kromhout. NHI quickly came forward with an improved design, called the H-3 Kolibrie (Hummingbird). This helicopter was powered by ramjets at the ends of the blades and made its first flight in May 1956. The Certificate of Airworthiness, based on U.S. requirements for rotorcraft, was issued in March 1958. Later operations ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helicopter
A helicopter is a type of rotorcraft in which lift and thrust are supplied by horizontally spinning rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward and laterally. These attributes allow helicopters to be used in congested or isolated areas where fixed-wing aircraft and many forms of STOL (Short TakeOff and Landing) or STOVL (Short TakeOff and Vertical Landing) aircraft cannot perform without a runway. In 1942, the Sikorsky R-4 became the first helicopter to reach full-scale production.Munson 1968.Hirschberg, Michael J. and David K. Dailey"Sikorsky". ''US and Russian Helicopter Development in the 20th Century'', American Helicopter Society, International. 7 July 2000. Although most earlier designs used more than one main rotor, the configuration of a single main rotor accompanied by a vertical anti-torque tail rotor (i.e. unicopter, not to be confused with the single-blade monocopter) has become the most comm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aviolanda
Aviolanda was a Dutch aircraft manufacturer. The company was established in December 1926 by H. Adolph Burgerhout. Aviolanda mainly produced licensed-built aircraft, such as the Curtiss P-6 Hawk, the Dornier Wal and Do 24 flying boats, and the Gloster Meteor, Hawker Hunter and the Lockheed F-104 Starfighter jets. Aviolanda was the parent company of Dutch helicopter manufacturer NHI. It was eventually taken over by Fokker Aircraft in 1967 and was renamed Avio-Fokker. Aviolanda had its main plant in Papendrecht. The production facility in Papendrecht was later used by GKN Aerospace to produce fuselage sections of the NHIndustries NH90. Aircraft produced *Aviolanda AT-21 The Aviolanda AT-21 was a target drone developed in the Netherlands by Aviolanda. Powered by a pulsejet engine, it was the Netherlands' first drone to be successfully developed, and saw limited use in the late 1950s and early 1960s. Design and d ... target drone References {{reflist Defunct aircraft manuf ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NHI H-3 Kolibrie
The NHI H-3 ''Kolibrie'' (Dutch for "Hummingbird") was a small helicopter developed in the Netherlands in the 1950s by Nederlandse Helikopter Industrie. It first flew in May 1956. Design The H-3 was a two seat general purpose helicopter. It had a duraluminium tube superstructure, an open cockpit and an undergear of metal skids. The design is typical of ultra-light helicopters of the period, being powered by tip-jets — two ramjets, one at the tip of each rotor blade. The small tail rotor, powered by the motion of the main rotor, was necessary only for yaw control since the tip-jets eliminated the need for an anti-torque force. The ramjets could burn multiple types of fuel, giving the helicopter a certain versatility. The Kromhout-designed-and-built ramjets generated thrust and made a complex gear box unnecessary. Later, Aviolanda-built ramjets generated thrust. In order to start the ramjets, a small auxiliary power unit spun the main rotor to 70 rpm, at which point the ramj ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ramjet
A ramjet, or athodyd (aero thermodynamic duct), is a form of airbreathing jet engine that uses the forward motion of the engine to produce thrust. Since it produces no thrust when stationary (no ram air) ramjet-powered vehicles require an assisted take-off like a rocket assist to accelerate it to a speed where it begins to produce thrust. Ramjets work most efficiently at supersonic speeds around and can operate up to speeds of . Ramjets can be particularly useful in applications requiring a small and simple mechanism for high-speed use, such as missiles. The US, Canada, and UK had widespread ramjet powered missile defenses during the 1960s onward, such as the CIM-10 Bomarc and Bloodhound. Weapon designers are looking to use ramjet technology in artillery shells to give added range; a 120 mm mortar shell, if assisted by a ramjet, is thought to be able to attain a range of . They have also been used successfully, though not efficiently, as tip jets on the ends of helicopt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Certificate Of Airworthiness
A standard certificate of airworthiness is a permit for commercial passenger or cargo operation, issued for an aircraft by the civil aviation authority in the state/nation in which the aircraft is registered. For other aircraft such as crop-sprayers, a Special Airworthiness Certificate (not for commercial passenger or cargo operations) must be issued. Legal authority A certificate of airworthiness (CoA), or an airworthiness certificate, is issued for an aircraft by the civil aviation authority in the state in which the aircraft is registered. The CoA attests that the aircraft is airworthy insofar as the aircraft conforms to its type design. Each certificate is issued in one of a number of different categories when the aircraft is registered in the name of the owner. Thereafter, a yearly currency fee is payable to renew the CoA. If this fee is not paid when due, the certificate expires and the owner must apply again for the certificate. The CoA can only be issued when a maintenanc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DAF Trucks
DAF Trucks is a Dutch truck manufacturing company and a division of Paccar. Its headquarters and main plant are in Eindhoven. Cabs and axle assemblies are produced at its Westerlo plant in Belgium. Some of the truck models sold with the DAF brand are designed and built by Leyland Trucks at its Leyland plant in England. History In 1928, Hubert "Hub" van Doorne founded the company as ''Commanditaire Vennootschap Hub van Doorne's Machinefabriek''. His co-founder and investor was A. H. Huenges, managing director of a brewery. Van Doorne had repaired Huenges' car several times, and Huenges, pleased with his work, offered to finance him in business. Hub started to work in a small workshop on the grounds of the brewery. In 1932, the company, by then run by Hub and his brother, Wim van Doorne, changed its name to ''Van Doorne's Aanhangwagen Fabriek'' (Van Doorne's Trailer Factory), abbreviated to ''DAF''. Huenges left the company in 1936 and the DAF company was then complet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stork B
Storks are large, long-legged, long-necked wading birds with long, stout bills. They belong to the family called Ciconiidae, and make up the order Ciconiiformes . Ciconiiformes previously included a number of other families, such as herons and ibises, but those families have been moved to other orders. Storks dwell in many regions and tend to live in drier habitats than the closely related herons, spoonbills and ibises; they also lack the powder down that those groups use to clean off fish slime. Bill-clattering is an important mode of communication at the nest. Many species are migratory. Most storks eat frogs, fish, insects, earthworms, small birds and small mammals. There are 19 living species of storks in six genera. Various terms are used to refer to groups of storks, two frequently used ones being a ''muster'' of storks and a ''phalanx'' of storks. Storks tend to use soaring, gliding flight, which conserves energy. Soaring requires thermal air currents. Ottomar Anschà ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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