fantom,
Just for my benefit, please ... can you indicate the rule differences of significance between flex and derate ?
. .yxcapt,
For many aircraft at light weights, low altitude/OAT, and min V2 schedules, the speed can be very close to Vmca during the takeoff rotation flare .. I have seen many a keen chap end up inverted (not to mention surprised) in the 737 during simulator exercises designed to demonstrate just this problem (and the more important concern of bank angle control under such failure circumstances). As I recall, Mr Douglas only scheduled min speed, BFL data ?