== List of coaxial rotor helicopters ==* Brantly B-1 (1946, but not produced in quantity)* Breguet-Dorand giroplane laboratoire (1936)* Breguet GIIE (1949-1951)* Cierva CR Twin* Eagle's Perch* EDM Aerotec CoAX 2D/2R* Gyrodyne QH-50 DASH* Gyrodyne 2C* Gyrodyne XRON-1* Gyrodyne GCA2* Kamov Ka-15* Kamov Ka-25* Kamov Ka-26* Kamov Ka-226* Kamov Ka-27* Kamov Ka-31* Kamov Ka-32* Kamov Ka-50 "Black Shark"* Kamov Ka-52 "Alligator"* Kamov-Kumertau Rotorfly* Kamov Ka-92* Manzolini Libellula* Phoenix Skyblazer* Sikorsky S-69* Sikorsky X2* Sikorsky S-97* Sikorsky/Boeing SB-1 Defiant== See also ==* Intermeshing rotors* Contra-rotating propellers* Tandem rotors== References ==== External links ==* Helicopter History Site
Leta 1859 je Britanski patenti urad odobril Henry Bright-ov patent za njegov koaksialni dizajn.