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{{Short description|
{{tooshort|date=July 2023}}
[[File:Ukrainian Ka-27PS on USS Taylor (cropped).jpg|thumb|right|300px|A Ukrainian Navy [[Kamov Ka-27]]]]
This rotor configuration is a feature of helicopters produced by the [[Russia]]n [[Kamov]] helicopter [[design bureau]]. == History ==
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== Design considerations ==
[[File:Gyrodyne QH-50
Having two coaxial sets of rotors provides symmetry of forces around the central axis for lifting the vehicle and laterally when flying in any direction. Because of the mechanical complexity, many helicopter designs use
=== Torque ===
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[[File:OnyxStar HYDRA-12.jpeg|thumb|Coaxial hexacopter – OnyxStar HYDRA-12 from [[AltiGator]]]]
[[Multirotor]] type [[unmanned aerial vehicle]]s exist in numerous configurations including duocopter,<ref>{{Cite web|title=DuoCopter, the perfect drone|url=https://www.research-drone.com/en/DuoCopter.html|access-date=2021-11-13|website=www.research-drone.com}}</ref> tricopter, [[quadcopter]], hexacopter and octocopter. All of them can be upgraded to coaxial configuration in order to bring more stability and flight time while allowing carrying much more payload without gaining too much weight. Indeed, coaxial [[multirotor]]s are made by having each arm carrying two motors facing in opposite directions (one up and one down). Therefore, it is possible to have
== Reduced hazards of flight ==
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* [[Bréguet-Dorand Gyroplane Laboratoire]] (1936)
* [[Cierva CR Twin]] (1969)
* [[Cranfield Vertigo|Cranfield ''Vertigo'']] (1987)
* [[Eagle's Perch]] (1998)
* [[EDM Aerotec CoAX 2D/2R]]
* [[Gyrodyne QH-50 DASH]]
* [[Hiller XH-44]] (1944)
* [[Kamov Ka-
* [[Kamov Ka-
* [[Kamov Ka-
* [[Kamov Ka-
* [[Kamov Ka-
* [[Kamov Ka-
* [[Kamov Ka-
* [[Kamov Ka-50]] (1982 and 1997 for Ka-52)
* [[Kamov Ka-92]]
* [[Kamov Ka-126]] (1988)
* [[Kamov Ka-226]] (1997)
* [[Manzolini Libellula]] (1952)
* [[Phoenix Skyblazer]] (2011)
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* [[Sikorsky/Boeing SB-1 Defiant]]
* [[Wagner Aerocar]]
* [[Ingenuity (helicopter)|Mars helicopter ''Ingenuity'']] (2021)
== See also ==
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