Also, all of the power from the engines can be used for lift, whereas a single rotor helicopter uses power to counter the torque.

Szczepanik also worked on a moving wing aircraft, a duplex rotor helicopter, a dirigible, and a submarine.

Pursuing the idea of a civil tandem rotor helicopter, Hafner and his team developed a much larger design, the Type 194.

Swashplates for helicopters having two rotors mounted on the same shaft are much more complex than the single rotor helicopters.

It was the first successful twin-engined, twin rotor helicopter in the world.

In a tandem rotor helicopter, forward cyclic will not arrest the rate of descent caused by settling with power.

The W.11 was a development of the Weir W.6 dual transverse rotor helicopter.

The Helicycle is a single-seat, single, semi-rigid main rotor helicopter powered by a turboshaft engine.

Ten hazards have been listed to indicate what a typical single rotor helicopter has to deal with.

Conversely, the synchropter and transverse-mounted rotor helicopters use differential collective pitch to affect the roll of the aircraft.