Originally Posted by rudderrat
I tend to agree. In just 46 seconds (between 2h 10 min 05 and 2 h 10 min 51) the aircraft climbed with ROC up to 7,000 ft/min from 35,000ft to “37,500 ft and the recorded angle of attack was around 4 degrees.” (which is a sensible angle of attack).
They must have ridden in the updraught of a CB to climb that rapidly and still have flying speed.
Not quite. quote: "In level flight at FL350 and M.82 the pitch attitude (=AoA in level flight - HN) was 2.5 degrees". AoA=4 degrees is approx. the stall warning threshold at M.8 and results in a normal load factor of 1.39. If that LF is maintained during 9 seconds V/S=7000 ft/min.
P.S.: OTOH, at FL375 and M.68, AoA=4° corresponds to LF=0.78, i.e. a reducing V/S. At 215 kCAS and 700 fpm the flight path angle is about 1° up, i.e. deck angle is 5° up.