Fernando
As baggywrinkle wrote there is little difference in dB level between TKOF power an and derate. However altitude seems to have a greater inpact on noise.
Concerning the V1/VR issue. If you use the (pre)calculeted values with the described corrections it should be accurat.
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Está esto el cambio de marchas?
[This message has been edited by Knold (edited 15 June 2001).]