Well to just about complete the worlds engine fleet of bypass ratios...........we have.....
P & W jt9d-3a and -7 at 5.0:1
GE CF6-50 at 4.2:1
RR RB211-22b at 5.0:1
RR RB211-524c2 at 5.0:1
RR RB211-524d4 at 4.311:1 (a bit less than it's sisters due to a bigger diameter L.P turbine).
