Originating report, July 1976. NTRS author abstract describes small nearly vertical wing-tip surfaces and wind-tunnel measurements of forces, moments and loads on a representative narrow-body transport wing. Its comparison with a tip extension approximately matches the increment in wing-fuselage-junction bending moment. The article's drag-budget example is original, not a numerical result of this experiment.
Additional exact locators: printed pp. 7–8, Incidence and twist and Cant or dihedral. These distinguish winglet incidence from cant and discuss the tradeoff among induced-drag reduction, skin friction and wing bending moments, including root-flow interference for outward cant. The Winglet cant angle article states its own explicit vertical-reference convention.

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