Brief Description: Pondering methods of strengthening the wings
Started running the stringers and I have been trying to work out a simple & lightweight method of generating more strength in the wing between rib 3 inboard to rib 9.
The Canadian TSB Lab Report on a C.A.D.I. wing of similar design that failed in 2009 showed that a compression failure of the top skin and spars occurred just inboard of rib 7 and the strut attachment points at the spars.
I will wait untill the Aeronautical Engineer that I have engaged turns up, before doing too much more, but I've been thinking that generating another spar along the centre of the wing between ribs 3 - 9 by using the stringer channels to form a truss arrangement and then plate that on each side maybe one answer, if it is deemed necessary.
The two centre stringers are vertically above & below each other and lend themselve nicely to what I have in mind.