On Apr 16, 4:10 pm, Brian Whatcott wrote:
The concept is "second moment of inertia" Bruce, not mass.

Hmmm. I think mass moment of inertia is what you're after (http://
en.wikipedia.org/wiki/Moment_of_inertia). Second moment of inertia is
form stiffness (eg. the "I"'s in a mast section description).

-- Tom.