DSK wrote:

Nav wrote:

Quiet Doug. People who understand engineering are talking.


In other words, you have no clue. Again.

If one could get the Imm of a section by using simple multiplication on
the result of another different section, then why would anyone ever use
calculus? Why all the fancy symbols and stuff?


A trained enginer knows that moment of interia scales scales between
shapes with same geometric peoperties such as in this case, width,
height and wall thickness. Perhaps you should look at the equations for
inertias of elipse, circle and boxe sections and then you will see why
my rule of thumb is not only corrrect but very useful? It's a pity that
you have such trouble with such freshman engineering.

Cheers