Counter rotating rotor

The counter-rotating rotor is a type of main rotor of helicopter .

It involves using two main rotors of equal characteristics but rotating in opposite directions to cancel the effects of torque and thus, save the anti-torque rotor and increase the payload .


Counter-rotating rotors can be:

Coaxial: Kamov appliances such as Kamov Ka-26 , Kamov Ka-50 etc.
Online: Focke-Achgelis Fa 223 Drache
In a row: Piasecki HUP-3
In V : Flettner Fl 282 Kolibri and Kaman K-Max . See rotor meshing .

By nature, the V-22 Osprey Convertible is the only ADAV- type operational aircraft with counter-rotating rotors and counter-rotating propellers. EADS has been working with other partners since 1987 on a similar project called EuroFAR (European Future Advanced Rotorcraft) 1 .

Operation of helicopters with counter-rotating rotor

The two counter-rotating propellers cause upward suction and downward thrust.


Helicopter coaxial birotors

The co-axial birotor radio-controlled helicopters are particularly designed for pilot training. They are more stable and easier to control than normal helicopters. They have two overlapping rotors rotating in opposite directions and do not have a tail rotor. The Dragonfly 53 and Micro 47G are examples of counter-rotating rotor models.

Coaxial Drones

The drones type Multirotor exist in many engine configurations: tricopter, quadcopter , hexacoptere and octocopter. For all these configurations, there are models of the coaxial type allowing a greater stability and autonomy of flight thanks to the gain of weight while raising more payload. Indeed, each arm thus supports two motors, rotating in opposite directions. One is facing the ground while the other is facing the sky. Thus, it is possible to have an octorotor in coaxial quadcopter format 2 .

Notes and references

  1. ↑ ( in ) European Tiltrotor helicopter Eurotilt  [ archive ] –
  2. ↑ Hélimag – tri, quad, hexa, octo, y4, y6, etc. okay but why?  [ archive ] –

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