Hello
I'm not a specialist of turbojet airplanes but I'm glad these few explanations helped and brought further questions.
The best would be to go to the performance guys I think they can show you:
- The lift versus drag curves so that you can see the evolution of the lift to drag ratio for V2 (if you are not limited by 1.1 VMC at 61000lbs) V2+10 V2+20). I guess at V2 the lift coefficient would be CLmax/1.44
- Check the engine thrust for these 3 speeds (lets say ISA - SL)
Then you can quickly hand compute the climb gradient and the vertical speed.
Getting back to your matters, at what distance from the end of the runway (and from the 35ft clearance) is the mic that measures the sound ? Is it far enough to clear the 2nd segment ? How is the noise measured, it's a matter of time and peak, or only of sound peak?
Chti Guillaume