On 7/5/2013 6:13 PM, dpb wrote:
[another drawing that didn't quote right]

Besides the above, there's the balance of forces that

F1 = F2+F3
....

I don't think so ... consider if L2 & L3 were much greater than L1.
Then F2 & F3 would be much less than F1 & still balance.

Thanks anyhow,
Bob