Tandem rotor helicopters are also in widespread use, due to their better payload capacity.

Tandem rotors are two rotors with one mounted behind the other.

Tandem rotor helicopters have the advantage of being able to hold more weight with shorter blades, since there are two sets.

A high-speed assault helicopter project with tandem rotors.

The Belvedere followed, a twin-engine, tandem rotor military helicopter.

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

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

Tandem rotor aerodynamics is a complex subject.

A helicopter with tandem rotors uses differential collective pitch to change the pitch attitude of the aircraft.

Tandem rotor helicopters, however, use counter-rotating rotors, with each canceling out the other's torque.

Tandem rotor helicopters have two large horizontal rotor assemblies mounted one in front of the other.

The Boeing CH-47 Chinook is the most common tandem rotor helicopter.

On the occasion, The Falcons will jump from a Chinook tandem rotor helicopter.

Nicolas Florine, a Russian engineer, built the first twin tandem rotor machine to perform a free flight.

Tandem rotor helicopters tend to have a lower disk loading than single rotor helicopters.

Tandem rotors achieve pitch attitude changes to accelerate and decelerate the helicopter through a process called differential collective pitch.

Frank Piasecki, 88, American aeronautical engineer who invented the tandem rotor placement in helicopter design, stroke.

After the Type 171, the Bristol Helicopter Division started work on a tandem rotor civil helicopter.

Similar to tandem rotors and intermeshing rotors, the transverse rotor also uses differential collective pitch.

Despite these issues, the relative success of Piasecki's tandem rotor design would lead to the Piasecki H-21 family of helicopters.

They are known for operating tandem rotor helicopters; in present times, exclusively the Boeing Vertol 107 and Boeing 234.

The Boeing Chinook is a tandem rotor helicopter operated by the Royal Air Force.

Tandem rotor helicopters typically require less power to hover and achieve low speed flight as compared to single rotor helicopters.

In July 1754, Mikhail Lomonosov demonstrated a small tandem rotor to the Russian Academy of Sciences.

The Boeing Vertol CH-46 Sea Knight is a medium-lift tandem rotor transport helicopter.