Tandem rotorhelicopters have two large horizontalrotor assemblies instead of one main assembly and a smaller tail rotor. The Bell 206 of Canadian Helicopters Robinson Helicopter Company (USA) R44, a four seat development of the R22 A helicopter is an aircraft which is lifted and propelled by one or more horizontal rotors (propellers). ... Horizontal is an orientation relating to, or in parallel with the horizon, and thus perpendicular to the vertical. ... R0t0r is from efnet ...
Single rotor helicopters need a tail rotor to counter the twisting moment produced by the single large rotor. Tandem rotor helicopters, however, have the rotors rotating in opposite directions, so there is no twisting moment produced.
This configuration also has the advantage of being able to hold more weight with shorter blades, since there are two sets. Also, all of the power from the engines can be used for lift, whereas a single rotor helicoptor only uses one main rotor for lift.
An example of a tandem rotor helicopter is the CH-47 Chinook. A field artillery section slingloading a M-198 howitzer for airlift by a CH-47 Chinook The CH-47 Chinook is a versatile, twin-engine, tandem rotor heavy-lift helicopter. ...
Turning the rotor generates lift but it also applies a reverse torque to the vehicle, which would spin the helicopter fuselage in the opposite direction to the rotor if no counter-acting force was applied.
In the flying-wagon or tandemrotor system (sometimes called "flying banana" for the peculiar shape of early U.S. examples), the two main rotors are located at the front and rear extremity of a long, boxy fuselage that resembles a railway wagon.
The main drawback of a tandemrotor is limited agility in air and the need for a highly trained crew, as the large main rotors have long outreach beyond the fuselage and may easily hit nearby obstacles.
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