Nav wrote:
You may be confused. Perhaps you would like to re-read your earlier
post? I'll highlight it for you:


DSK wrote:
That's why triangular sections have the greatest rigidty for
their cross section area, and square sections are more rigid than
oval or round.


You did say most rigid didn't you? I'd say that rigid means best able to
resist bending -but perhaps you have some other use of the term? It's
strange but engineering texts say that the section that best resists
bending is an I or T section.


No, engineering texts say that "I" or "T" sections have the greatest
rigidity *in a defined plane*.

... But Doug is always right

Nope, I've been wrong several times. But this isn't one of them.

... so we must all be
wrong!

Who's "we" kimosabe?

BTW do you know what a cosine is? If you have the slightest clue about
any sort of engineering ... or even high school geometry... then my
diagram should be relatively easy to understand for you...

The compression force on the boom is the cosine of what angle?
What is that strange symbol on the mast represent? I believe earlier you
claimed the force on the mast had to be the exact same as the weight
suspended from the boom? Care to backpedal on that one, or don't you
understand what you yourself said?

DSK