DSK wrote:



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

Yes that's what I said ealier! What is it with your inability to read?
Anyway, now you know a triangle section isn't _always_ the strongest for
a given amount of material. You must be so happy to have learnt
something new! Hooray!


... 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?

No, no, you silly man you need to re-read your posts. It was _you_ who
keeps saying it's a cosine -not me! Are you now realizing that you were
wrong and it's not a cosine after all? You do know what a cosine is
don't you?

Cheers