Hi PRAAM
All you said, even about 411a, sounds very reasonable
and after this one:
>>" Plenty of other transport aircraft prior to the 707 had insufficient rudder and/or other problems in directional stability or vertical stabilizer failure. Vmca was discovered prior to you, mate. In fact, the dutch roll phenomena affecting early 707's and KC-135's was well before the Flushing smash, leading to the fin extension and lower strakes on the Intercontinental. <<
did not we come full circle on this topic?
A300 HAD sufficient rudder...