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{{Short description|Helicopter with two sets of rotor blades placed on top of each other}}
{{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 ==
[[File:Gyroplane-Laboratoire1.jpg|right|thumb|Gyroplane-Laboratoire]]
The idea of coaxial rotors originates with [[Mikhail Lomonosov]]. He had developed a small helicopter model with coaxial rotors in July 1754 and demonstrated it to the [[Russian Academy of Sciences]].<ref>Leishman, J. Gordon (2006). Principles of Helicopter Aerodynamics. Cambridge University Press. p. 8. {{ISBN|0-521-85860-7}}</ref>
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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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== Coaxial multirotors ==
[[File:OnyxStar HYDRA-12.jpeg|thumb|Coaxial hexacopter
[[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 ==
{{Main|Helicopter#Hazards}}
The [[U.S. Department of Transportation]] has published a “Basic Helicopter Handbook”. One of the chapters in it is titled, “Some Hazards of Helicopter Flight'. Ten hazards have been listed to indicate what a typical single rotor helicopter has to deal with. The coaxial rotor design either reduces or completely eliminates many of these hazards. The following list indicates which:
* [[Vortex_ring_state|Settling with power]] — Reduced
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== List of coaxial rotor helicopters ==
[[File:Russian Air Force Kamov Ka-50.jpg|thumb|right|[[Russian Air Force]] Kamov [[Kamov Ka-50|Ka-
[[File:XH-59 U.S. Army demonstrator.jpg|thumb|[[Sikorsky S-69]]/XH-59A with auxiliary turbojets]]
[[File:A Russian Helix KA-27 (cropped).jpg|thumb|
* [[Bendix Helicopters|Bendix]] Model K (1945)
* [[Brantly B-1]] (1946)
* [[Bendix Helicopters|Bendix]] Model J (1946)
* [[Bréguet G.111]] (1949)
* [[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]]
* [[
* [[Kamov Ka-
* [[Kamov Ka-
* [[Kamov Ka-
* [[Kamov Ka-
* [[Kamov Ka-
* [[Kamov Ka-
* [[Kamov Ka-27]] (1974)
* [[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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