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Intermeshing-rotor Helicopter
An intermeshing-rotor helicopter (or synchropter) is a helicopter with a set of two main 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. 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 produced the HH-43 Huskie, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USAF
The United States Air Force (USAF) is the Air force, air service branch of the United States Department of Defense. It is one of the six United States Armed Forces and one of the eight uniformed services of the United States. Tracing its origins to 1 August 1907, as a part of the United States Army Signal Corps, the USAF was established by transfer of personnel from the Army Air Forces with the enactment of the National Security Act of 1947. It is the second youngest branch of the United States Armed Forces and the fourth in United States order of precedence, order of precedence. The United States Air Force articulates its core missions as air supremacy, intelligence, surveillance, target acquisition, and reconnaissance, global integrated intelligence, surveillance and reconnaissance, airlift, rapid global mobility, Strategic bombing, global strike, and command and control. The United States Department of the Air Force, Department of the Air Force, which serves as the USAF's ... [...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, a railway station on the Mumbai Suburban Railway in Mumbai, India * Kamadeva Kamadeva (, ), also known as Kama, Manmatha, and Madana is the Deva (Hinduism), Hindu god of Eroticism, erotic love, carnal desire, attraction, pleasure and beauty, as well as the personification of the concept of ''kāma''. He is depicted as a ..., the Hindu god of human love * Kaman (Miju) Mishmis, a people of northeastern India and Tibet ** Kaman language or Miju Mishmi language, their Sino-Tibetan language 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, Kırşehir, a town of Turkey * Kaman D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kaman HH-43 Huskie
The Kaman HH-43 Huskie is a helicopter developed and produced by the American rotorcraft manufacturer Kaman Aircraft. It is perhaps most distinctive for its use of twin intermeshing rotors, having been largely designed by the German aeronautical engineer Anton Flettner. First flown on 21 April 1953, the HH-43 went into production and was operated by several military air services, including the United States Air Force, the United States Navy and the United States Marine Corps. It was primarily intended for use in aircraft firefighting and rescue in the close vicinity of air bases, but was extensively deployed during the Vietnam War. It was used as a search and rescue platform, having often been enhanced with makeshift modification and new apparatus to better suit the tropical conditions. The HH-43 was also exported to several other countries and sold commercially. It set several aviation records in its class, and was the first helicopter to experiment with twin-turbine engines. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SNCAC NC
SNCAC (the ', sometimes known as ) was a French aircraft manufacturer. SNCAC was created by the nationalisation of the Farman Aviation Works and Hanriot firms in 1936. The company had a manufacturing facility in Boulogne-Billancourt which was damaged by Allied bombing on 3 March 1942. 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 The Nord NC.850 (originally produced as the Aérocentre ... [...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. Although ... [...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 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. Initially discounted on theoretical grounds, the proposal was re-examined in the light of tests done with models by the Army's Experimental Engineering Section, and was accepted on 7 January the following year. This was followed on 11 September with a contract ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unmanned Aerial Vehicle
An unmanned aerial vehicle (UAV) or unmanned aircraft system (UAS), commonly known as a drone, is an aircraft with no human pilot, crew, or passengers onboard, but rather is controlled remotely or is autonomous.De Gruyter Handbook of Drone Warfare; 2024. e-ISBN (PDF) 978-3-11-074203-9.H. Pan; M. Zahmatkesh; F. Rekabi-Bana; F. Arvin; J. HuT-STAR: Time-Optimal Swarm Trajectory Planning for Quadrotor Unmanned Aerial Vehicles IEEE Transactions on Intelligent Transportation Systems, 2025. 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. These include aerial photography, area coverage,F. Rekabi-Bana; Hu, J.; T. Krajník; Arvin, F.,Unified Robust Path Planning and Optimal Trajectory Generation for Efficient 3D Area Coverage of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Optionally Piloted Vehicle
An optionally piloted vehicle (OPV) or optionally piloted aerial vehicle 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USMC
The United States Marine Corps (USMC), also referred to as the United States Marines or simply the Marines, is the maritime land force service branch of the United States Department of Defense. It is 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 six armed forces of the United States and one of the eight uniformed services of the United States. The Marine Corps has been part of the United States 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 bega ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kaman K-MAX
The Kaman K-MAX (company designation K-1200) is a helicopter with intermeshing rotors (synchropter) designed and produced by the American manufacturer Kaman Aircraft. Developed during the 1980s and 1990s, the K-MAX builds on the work of the German aeronautical engineer Anton Flettner. Performing its maiden flight on December 23, 1991, it was specially designed to optimally perform Cargo hook (helicopter), external cargo load operations and is capable of lifting payloads in excess of , which is greater than the helicopter's empty weight and almost twice as much as the competing Bell 205 despite sharing a similar engine. Being a synchropter, it has greater efficiency in comparison to conventional rotor technology. In addition to aerial crane, airlifting external loads, specialised configurations for Helitack, aerial firefighting and casualty evacuation have been developed. It was produced for both military and civilian operators. Kaman sought to develop the K-MAX into an unmanned ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
