On Tue, 20 Jul 2010 12:25:58 +0100, Roger Mills wrote:

Only *just* behind that point, it might be a little
"unpredictable"
and if it did tip it would keep going, as it would become more and
more unblanced as it tipped.

As long as the long leg can't move backwards - i.e. it's tied to the
other two legs at ground level, it couldn't tip forwards very far
because the 'load' would come into contact with the wall.

Or window... and keep going...

[Takes me back a bit. When I did A-level Applied Maths, I used to
analyse hundreds of similar structures - resolving all the forces and
moments - but that was 50 years ago, and I'm a bit rusty!]

Ah the only bit of Pure Maths I could understand were those bits that
I needed to do the Applied Maths...

--
Cheers
Dave.