Ian, yes, all that makes sense...
When I first used term
deep stall a few hundred posts ago, I did qualify it (knowing well the original meaning & the eybrows it would raise)
Controls Induced Deep Stall as suggested then, or similar
Only if manually trimmed heavily NU, would any other aircraft be likely to behave likewise I think... without that, (and with sensible s-s control feedback, not this arbitrary spring feel), aircraft should be
difficult to hold into any sort of stall let alone a deep one...
.. that is how aircraft used to work, remember
