Dave and Mayf - If air pressure makes a flat panel bulge 1/8" over a 13" span
no yielding has occured - All alloys of alumimum are equaly elastic so if the
panels were 1100 or 7075 they would both bulge the same amount - I hate to
double the number of Dzus buttons so I think riveting a stiffener on the
inside is the best - Was just wondering what button spacing others would use
in this area of low pressure - Dave I daily use my copy of Machinerys Handbook
but I have better information on propertys of metals .
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