Could someone explain how the 8.5″ by 3.5″ cutout applies in Chapter 20?
The upper right hand corner of chapter 20, page 1 shows the foam block cores for both the “Upper” and “Lower” winglets. The lower part of the pictures is showing the “Lower” winglet. The 8.5″ dimension is the height of the lower winglet. The 3.5″ dimensions is showing you how to cut the blocks so that you get the “aft” sweep of the lower winglet as you go from WL 18.4 downward, i.e., the lower winglet sweeps back as it goes down. Remember the upper and lower winglets are cut out separately and microed together later.
