translational lift
The efficiency of the hovering rotor system is improved with each knot of incoming wind gained by horizontal movement or surface wind.
Eventually translational lift is attained, and the helicopter has enough excess lift to gain altitude and airspeed. The helicopter is kept low to the ground while it accelerates to best rate of climb airspeed.
As the helicopter speed increases, translational lift becomes more effective and causes the nose to rise, or pitch up (sometimes called blowback). This tendency is caused by the combined effects of dissymmetry of lift and transverse flow.
 See also: Lift, Power, Helicopter, Pilot, Rotor
  
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