[balloon-makers] Stress calculations?

[Tom Deering <private e-mail address>]

Geez, let me try this again.

Can AutoCad compute stress?  Does it know about the physics of 
gravity, pressure, or enertia?

If not, how the heck to engineers design things?  Slide rules?  :^)

Tom
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tmd@deering.org    http://www.deering.org
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