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Intermeshing Rotors
Intermeshing rotors on a helicopter are a set of two rotors turning in opposite directions, with each rotor mast mounted with a slight angle to the other, in a transversely symmetrical manner, so that the blades intermesh without colliding. The arrangement allows the helicopter to function without a tail rotor, which saves power. However, neither rotor lifts directly vertically, which reduces efficiency per each rotor. This configuration is sometimes referred to as a synchropter. Yaw is accomplished through varying torque, which is done by increasing collective pitch on one of the blade sets. Most intermeshing designs have two blades per mast, although exceptions such as the Kellett XR-10 with three blades per mast do exist. The arrangement was developed in Germany by Anton Flettner for a small anti-submarine warfare helicopter, the Flettner Fl 265 as the pioneering example, and later the Flettner Fl 282 Kolibri. During the Cold War the American Kaman Aircraft company pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kaman K-225
The Kaman K-225 is an American experimental helicopter developed by Kaman Aircraft. One example was modified to become the world's first gas turbine-powered helicopter. Design and development The K-125 was Charles Kaman's first helicopter, which utilized intermeshing rotors and Kaman's patented servo-flap stability control."Hall of Fame/Inventor Profile: Charles Kaman" The K-125 first flew on 15 January 1947. The K-190 and K-225 were an improved versions of the K-125, which first flew in April and July 1949 respectively. The U.S. Navy bought two and the Coast Guard one for $25,000 each. The United States Air Force evaluated one K-225 with the designation YH-22. A modified K-225 equipped with a Boeing 502 (YT50) turboshaft engine became the first gas turbine-powered helicopter in December 1951. This aircraft is now at the Smithsonian Institution in Washington, D.C. A standard K-225 is preserved in the New England Air Museum at Windsor Locks Connecticut. In 1953, the Turkish ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kaman K-700
Kaman may refer to: * Kaman (surname) * Kamein (Kaman), an ethnic group in Burma * Kaman Aircraft, an American aerospace company and helicopter manufacturer * Kaman Music Corporation, a company of several musical instrument manufacturers * Kaman Road Kaman Road is a Railway Station in Naigaon East on the Vasai Road– Diva–Panvel Rail Route of the Central Line of the Mumbai Suburban Railway network. Kaman Road is the next Railway Station after Kharbao Railway Station in the South & be ..., a railway station on the Mumbai Suburban Railway in Mumbai, India * Kamadeva, the Hindu god of human love Places * Kaman, Iran, a village in Qazvin Province, Iran * Kaman, Rajasthan, a city and municipality in the Bharatpur district of Rajasthan, India * Kaman, Pakistan, town in Punjab, Pakistan * Kaman (District), Kırşehir, a district of Turkey See also * Kamani (other) {{disambiguation, geo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kaman HH-43 Huskie
The Kaman HH-43 Huskie is a helicopter with intermeshing rotors used by the United States Air Force, the United States Navy and the United States Marine Corps from the 1950s until the 1970s. It was primarily used for aircraft firefighting and rescue in the close vicinity of air bases, but was later used as a short-range overland search and rescue aircraft during the Vietnam War. Under the aircraft designation system used by the U.S. Navy pre-1962, Navy and U.S. Marine Corps versions were originally designated as the HTK, HOK or HUK, for their use as training, observation or utility aircraft, respectively. Design and development In 1947 Anton Flettner, a German aviation engineer, was brought to New York in the United States as part of Operation Paperclip. He was the developer of Germany's Flettner Fl 282 "Kolibri" (Hummingbird), a helicopter employing the "synchropter" principle of intermeshing rotors, a unique design principle that dispenses with the need for a tail rotor. Flet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SNCAC NC
SNCAC (the ', sometimes known as ) was a French aircraft manufacturer created by the nationalisation of the Farman Aviation Works and Hanriot firms in 1936. It was liquidated in 1949, with assets distributed between SNCAN, SNCASO, and SNECMA, all of which were nationalised firms. Aircraft * SNCAC NC.130 *SNCAC NC.150 * SNCAC NC 211 Cormoran * SNCAC NC.270 *SNCAC NC-290 - abandoned project for a four-engined ( Nene-powered) jet transport for 60 passengers. * SNCAC NC.420 * Farman NC.470 *SNCAC NC.510 *SNCAC NC.530 *SNCAC NC-600 * SNCAC NC.701 Martinet * SNCAC NC.702 Martinet *SNCAC NC.800 Cab - abandoned project for a light twin-engined transport * NC.832 Chardonneret * NC.840 Chardonneret * NC.841 Chardonneret *SNCAC NC.851 *SNCAC NC.853 *SNCAC NC.854 *SNCAC NC.855 *SNCAC NC.856 * SNCAC NC.900 * SNCAC NC.1070 * SNCAC NC.1071 *SNCAC NC 1080 The SNCAC NC 1080 was a French jet-engined interceptor developed in the late 1940s by SNCAC for use aboard aircraft carriers. It was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Praga E-1
Praga is a district of Warsaw, Poland. It is on the east bank of the river Vistula. First mentioned in 1432, until 1791 it formed a separate town with its own city charter. History The historical Praga was a small settlement located at the eastern bank of the Vistula river, directly opposite the towns of Old Warsaw and Mariensztat, both being parts of Warsaw now. First mentioned in 1432, it derived its name from the Polish verb ''prażyć'', meaning ''to burn'' or ''to roast'', as it occupied a forested area that was burnt out to make place for the village. Separated from Warsaw by a wide river, it developed independently of the nearby city, and on 10 February 1648 king Władysław IV of Poland granted Praga with a city charter. However, as it was mostly a suburb and most buildings were wooden, the town was repeatedly destroyed by fires, floods and foreign armies. Currently the only surviving historical monument from that epoch is the Church of Our Lady of Loreto. Altho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kellett XR-8
The Kellett XR-8 (later redesignated XH-8) was a helicopter built in the United States during World War II. It was a two-seat machine intended to demonstrate the feasibility of a twin-rotor system and, while it accomplished this, it also demonstrated a number of problems that prevented further development of this particular design. Design and development The successful demonstration of the Sikorsky VS-300 had the USAAF favoring the helicopter over the autogiro as an approach to rotary-winged flight. Realizing this, the Kellett Autogiro Corporation The Kellett Autogiro Corporation was an American aircraft manufacturer from 1929 based in Philadelphia, named after founder W. Wallace Kellett. History The Kellett Aircraft was formed by W. Wallace Kellett and C. Townsend Ludington and their b ... made a proposal to the USAAF on 11 November 1942 for the development of a twin-rotor helicopter that would eliminate the need for a tail rotor and its attendant loss of power. Initiall ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unmanned Aerial Vehicle
An unmanned aerial vehicle (UAV), commonly known as a drone, is an aircraft without any human pilot, crew, or passengers on board. UAVs are a component of an unmanned aircraft system (UAS), which includes adding a ground-based controller and a system of communications with the UAV. The flight of UAVs may operate under remote control by a human operator, as remotely-piloted aircraft (RPA), or with various degrees of autonomy, such as autopilot assistance, up to fully autonomous aircraft that have no provision for human intervention. UAVs were originally developed through the twentieth century for military missions too "dull, dirty or dangerous" for humans, and by the twenty-first, they had become essential assets to most militaries. As control technologies improved and costs fell, their use expanded to many non-military applications.Hu, J.; Bhowmick, P.; Jang, I.; Arvin, F.; Lanzon, A.,A Decentralized Cluster Formation Containment Framework for Multirobot Systems IEEE Tr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Optionally Piloted Vehicle
An optionally piloted vehicle (OPV) is a hybrid between a conventional piloted aircraft and an unmanned aerial vehicle (UAV). Able to fly with or without a human crew on board the aircraft, OPVs are a low-cost alternative to UAVs in research, experimentation, and concept exploration, but may also become used in mainstream operations as familiarity with them increases. Unimpeded by a human's physiological limitations, an OPV is able to operate under more adverse conditions and/or for greater endurance times. Retaining on-board controls, the OPV can operate as a conventional aircraft during missions for which direct human control is preferred or desired as an immediate option. The US Naval Postgraduate School Center for Interdisciplinary Remotely-Piloted Aircraft Studies (CIRPAS) in Monterey, California operates a highly modified Cessna 337-O2 Skymaster OPV called Pelican. The OPV provides a low-risk, low-cost test and evaluation alternative to a Predator UAV. The Pelican has also ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USMC
The United States Marine Corps (USMC), also referred to as the United States Marines, is the maritime land force service branch of the United States Armed Forces responsible for conducting expeditionary and amphibious operations through combined arms, implementing its own infantry, artillery, aerial, and special operations forces. The U.S. Marine Corps is one of the eight uniformed services of the United States. The Marine Corps has been part of the U.S. Department of the Navy since 30 June 1834 with its sister service, the United States Navy. The USMC operates installations on land and aboard sea-going amphibious warfare ships around the world. Additionally, several of the Marines' tactical aviation squadrons, primarily Marine Fighter Attack squadrons, are also embedded in Navy carrier air wings and operate from the aircraft carriers. The history of the Marine Corps began when two battalions of Continental Marines were formed on 10 November 1775 in Philadelphia as a s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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