I know this may sound like a stupid question, but I just got to ask it. The F-101 has a pretty large fan, much larger than it's core mates the F-110 and F-404. It fan is very closes to the smallest CFM 56 high by-pass turbo fan which is also built off the same core. I know being a super sonic after burning turbo fan it could not be high by-pass, but could it be medium by-pass or is it low by-pass like I thought. Another reason I ask this question, is the fact that article or reading about the F-101 never call it a low by-pass engine or talk about it's by-pass at all. So is a medium by-pass or low by-pass turbo fan.