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Originally Posted by TomcatViP
Compressibility is not really affecting the tail surface (even if it does).
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LOL I love you man
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In fact most comments on this phenomena are describing the formation of shocks waves on the wing surface that affect the pitching moment. The pitching moment is so great that the tail surface can't compensate for it... Hence the horrific impression to pull the stick without effect. The immediate solution is to lower the Mach number.
yeah yeah ... I know I am "marking" the wall myself here too but ... this thread is full of info for anyone (e.g : a reminder is a valid info)... Let's step fowrd pass that ugly wall 
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I always dozed during my theory lessons, but if memory serves compressibility on tail surfaces is the creation of shock waves on the leading edge, which creates a void that makes the control surfaces ineffective because they're outside of the airstream (Viper might give a more educated explanation of it).