 Wind-tunnel Investigation of Effects of Rear Upper Surface Modification on an NASA Supercritical Airfoil by Charles D. Harris and James A. Blackwell, Jr.

Primary report: ntrs.nasa.gov/api/citations/19830002750/downloads/19830002750.pdf?attachment=true . Full published bylines verified on the report title and first text pages; no initials expanded beyond those bylines. Summary and Introduction, printed pp. 1–2: shaping for reduced shock and separation loss, and an off-design second velocity peak. Apparatus and Techniques, printed pp. 4–6: slotted transonic tunnel, controlled boundary-layer transition, flush pressure orifices and a wake rake approximately one chord downstream. Tests span Mach 0.60–0.81; the Summary reports that the tested attempt to reduce the second peak adversely affected design-condition drag.