Coaxial rotor helicopters

decommissioned NASA rotorcraft on the Mars 2020 mission

attack helicopter series by Kamov

anti-submarine helicopter family by Kamov

1961 anti-submarine helicopter family by Kamov

1956 utility helicopter family by Kamov

Russian utility helicopter

proposed high-speed scout and attack compound helicopter

Soviet utility helicopter

experimental high-speed compound helicopter with coaxial rotors

1949 scout helicopter series by Kamov

experimental gyrodyne by Sikorsky and Boeing

type of rotation configuration for helicopter rotor blades

experimental helicopter by Kamov

type of aircraft

Soviet utility helicopter

experimental co-axial compound helicopter

type of aircraft

1959 anti-submarine unmanned helicopter family by Gyrodyne

Soviet light utility helicopter

transport helicopter family by Kamov

prototype naval helicopter

type of aircraft

1954 experimental personal helicopter model by de Lackner Helicopters

type of aircraft

experimental aircraft

type of aircraft

type of aircraft

1955 prototype observation rotorcycle family by Gyrodyne

type of aircraft

Japanese helicopter design

Unusual German aircraft project.

American high-speed scout and attack compound helicopter

type of aircraft

type of aircraft