Originally Posted by
Bergerie1
tdracer,
Do you have any information on the 747-8 flutter flight testing data that you can share? I would be very interested to know how the 747 performed and handled in the 0.99 Mach range.
No - that was all left behind when I retired, and even if I did have anything I'm quite sure it's considered Boeing Proprietary. Besides, the stuff I was looking at was very engine focused - I was comparing the FADEC sensed Pamb with the aircraft trailing cone measurements to see if we needed to adjust the FADEC calibration curves and tolerances.
During the 747-400/PW4000 flight testing, when they did the high speed flutter testing they set 'ENG CONTROL' on all four engines at pretty much the same time because shock waves on the engine cowling really mess with the FADEC sensed Pamb... My then boss got a pretty panicked call from Flight Test wanting to know what the
was going on - he replied to the effect he didn't know, but tell them to land!