gaps
Interesting subject - thanks for feedback folks,
ref the root gap this reminds of when I used to fly Condors, (FUN !)
there is (was ? - post CAA-now EASA/PFA) an AD to ensure that the gap between the elvator & tailpane was taped over - if not, the gap adversely affected the elevator effectiveness due to bleed through airflow - not quite sure of the exact terminology but I know of another Condor operator who chose to ignore this AD which very nearly resulted in a tragedy.
I believe the 'bleed through' airflow caused loss of elevator authority ?