Interesting thoughts, Bob! One point in JJ's post that caught my eye was the fact that all these accidents happened in SH gliders with a motor. I have to claim ignorance about the way the motor is held in the stowed position but is there a possibility that the engine assembly pushes down onto the elevator control rod when subjected to high g-loads?
Uli
'AS'

No. The engine bay's lower enclosure is the shell of the fuselage.

So how are the control rods/cables routed past the engine bay? On either side of the engine bay? Between the outside shell and the engine compartment?
As I said, I am not familiar with these designs.

Uli
'AS'