Interesting to hear DPD's observations about deep stall probs on the T-tails. He recalled incidents when aircraft without stick pushers pancaked in after inability to recover. I've often wondered whether recovery would be possible by rolling to 90 degrees bank (assuming residual roll control available) and yawing the nose down to build airspeed and thereby escape from the stall regime. Presumably there must be a flaw in this reasoning otherwise the pilots involved would have tried it.