Hi guys, just tested the 38 in QMB in a power dive from 7500m.
Whilst compressability (buffeting and heavy elevator effects) start at the requisite indicated airspeeds, the documented elevator ineffectiveness at this mach number is not apparent.
By all accounts in the prototype the elevators were at the focus point of shockwaves which made them useless and the aircraft would even begin to tuck under (start an outside loop) until denser air was reached and the Mach decrease. Given you were not a) going too fast and b) not going too steep at this point you could recover.
The new mach effects on the FM no longer appear to demonstrate this effect. Elevators, whilst still heavy, are effective and can be used to recover above the critical altitude. Similarly trim.
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