Originally Posted by cat man do
How about if he cuts a 3 inch hole through the structural beams or uni's ?
Don't you think the strength would be considerably weakened then?
I do not propose cutting thru anything but a panel. A panel is defined as an area of equal thickness. I don't know what you mean by a "uni," but if it is a reinforcing buildup (what we in aviation call a "stringer") then do not cut thru it.
In your photo
, I see 6 square areas each of which have a diagonal reinforcing member
. This reinforcing member
divides the square into 2 triangular panels
. In this example, make the hole in the middle of the triangle.