Further to engine starting, how fast do the fan blades rotate? I know that in older engines the distinctive "crackle" ie BAC 1-11 was air ejected at supersonic speed. If the fan blades close in on Mach 1 does that affect efficiency?
I also read that fan blades are tested for strength and distortion, maybe we could use Kevlarcarl to check on the strength of the Boeing 777 engine fan blades, see if he´s as much use to an engine as he is the spotters on this site, in a SPOTTERS area too!
