My colleagues and I have obtained useful results with pressure-belts oriented both perpendicular to the leading-edge on a 60 degree delta- wing aircraft (F-106B-reported in NASA TP-3374) as well as stream wise on a cropped arrow aircraft (F-16XL-1-reported in NASA/TP- 2001-210629). Stream wise is best for integrating the pressure data at specific butt lines, plus the ports can be staggered along these belts so that data can be plotted /integrated at constant fuselage-stations. But for wings with significant vertical flows, I have not seen the answer to the pressure-accuracy question. (I am familiar with the paper by Poisson-Quinton, Philippe. Eight Theodore von Karman Memorial lecture: Slender Wings for Civil and Military Aircraft. Israel Journal of Technology 1978;16(3):97-131 in which Concorde flight- and wind- tunnel-pressures compare very well, but I do not know the details of how the flight-pressure data was obtained.
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