Terry, the upper wing surface did not have enough bow in it to meet the matching bow in the fuselage. What you are seeing in the last shot of mine, where the upper surface drops down at the front and rear edge is where I don't have quite enough shim between the upper and lower surfaces to make it match up, if that makes sense.
Just about JKim, just about. I have to find another plastic tooth pick and I'll have it. Thing is.........................I ain't got no more.
Looks like you have the right idea for fixing the wing curvature Brooks. I think Terry was seeing that the dihedral looks a bit flat in your picture, though the camera can play tricks. If you're happy with the dihedral, then good to go.
The wing dihedral is measured to the middle line of the leading edge. Unless the airfoil at the wing root and the one at the wing tip are the same or all aerofoils have the flat bottom. In the case the wing dihedral can be measured to the bottom wing surface. For the P-51, the first way is to use. Here is a sketch...
Aaron, with the information Wojtek presented your good to go, just have to get those shims you ran out of. Looking forward to seeing more on this build.
I understood why you posted it Andy, I just didn't know if mine was off. You guys need to borrow my Peg Mallet from time to time and give me a good whack with it. It's at about 4.5 degrees heavy. I don't think I'll bother with. Murphy and I would just make worse. I hope to get some work done to it this weekend.
I know this is a P-51C and a field modified two seater at that, but I thought some might be helpful. This is the Collings Foundations P-51C I took shots of a few years back. I have more if you want but thought I would see if they help.