mutt,
My figures in regard of Vmcg and Vmca are based on 744 performance:
CF6 engine
Full thrust(TO):
OAT 15 C/Airport pressure alt=0
Vmcg=125 KIAS
Derate One(TO1):
Same OAT/Press. alt.
Vmcg=123 KIAS
Derate two(TO2):
Vmcg=117 KIAS as I remember,because now I don't have that chart available.
Vmca figures are based on information recived during ground school.That kind of data Boing don't publish in AFM (I don't know why) .
Regards,
Moon11