• Rib flange dimples
    Section 14
    Dec 24, 2020

    The plans were not particularly clear on this, and I only discovered exactly which flanges should be dimpled in the top wing skin section. In short, do not dimple upper flange of the inboard 4 ribs! The doublers for the skin to reinforce the section that can be walked on are too think to dimple and will be machine countersunk instead.