SAMPUBLIUS wrote
crude example- at 60 mph, put your hand out the window. face palm down like an airplane wing. Now twist palm 90 degrees so palm faces forward.
feel the difference ? Now multiply that force by 8 to 10 and thats for a small area of say 25 square inches. Now multiply that by say 800 for a approx body diameter closed tube into the ' wind "
In addition, plane losing control may dive or nose up or twist or turn
Forces above 3 to 4 g would exceed max design overload - ultimate - in a few seconds or less.
The concept of airodynamic drag is known to me. Don't forget that the pressure at 33000 feet is only 1/5th of ground pressure.
The lockerby report concluded also that the pressure on the back section even as an open tube would not cause the structure to fail.
In your terms: The issue is how the hand changed from horizontal to vertical.