After the war it is easy to be a Minister of war...
Anyway....
When we talk about wrong V1 Vr and V2, would it not be helpful to check The Actual Acceleration till 100 KTS or any other bellow V1
against Calculated Acceleration in seconds.
It is not only weight that can lead to underspeed at V1 Vr and V2, but also:
change of wind,
engines' thrust bellow expected,
brakes not exactly off for one reason or another, etc. etc.
(or check the Acceleration even by INS or GPS etc. g-Force
if available perhaps like in (411A) L1011s)
