Improved Climb Technique aka Increased V2 Technique
This technique uses any excess ASDA to accelerate to a higher V2 to improve the 2nd segment climb gradient, thereby increasing the climb and possibly obstacle RTOW limits.
Because of the higher runway speeds used, this technique may not be used when the runway is slippery or contaminated or if the antiskid is off. Also, you may not use an improved climb if it is possible to take-off with normal speeds, for example by using engine bleeds off.
Example 1 – Increasing the Climb Limit
Excess ASDA is used to accelerate to higher speeds to increase the climb gradient, thereby improving a climb limited RTOW.
Example 2 – Increasing the Obstacle Limit
Excess ASDA is again used to increase the climb gradient, in this case for obstacle clearance. This will not always help because the rotation point will get closer to the obstacle as Vr increases, the technique is more effective the further away the obstacle is from the runway. Also, its effective height will change if there is any runway slope.
The above should have had diagrams to show the two examples but they didn't paste.
S & L