Vref = aicraft weight (i.e= 37000 lbs take 37) + 55
3 times the N1 gives you the evolution speed (i.e in clean conf to fly around 180 kts 3 times #60 % N1)
73 - Acft Weight = FL with 3 engines
63 - Acft "" = FL N-1
43 - """"" = FL N- 2
Normal take off SF 20 pitch around 15° / noise dep 17 to 20° max to have V2 +10..
Evolution (1,45 VS)
clean = Vref + 55
Slats = Vref + 35
S+F20= Vref +25
well that's all I can remember...
have fun