[Leica] traveling with canned goods in bigger tin cans...

[bs.pearce at cox.net (Sue Pearce)]

Frank,

The stress in the square corners would have been negligable in a 
non-pressurized aircraft. The square ccorners were the place where it first 
appeared.

A pressurized aircraft cabin is just that- a pressure vessel. The pressure 
inside makes the cabin want to become a sphere.The metal distorts as 
pressure is applied, and when released, or offset by a return to lower 
altitudes where there is nopressure differental, it returns to its normal 
shape. Each cycle brings on the inevitable.

Ah, but if we could only add just a bit of spandex to the alloy.

Bill Pearce