Ultra High Bypass (UHB) Nacelle Semi Span Model.Ultra High Bypass (UHB) Nacelle Semi Span Model. To test Force, moment, and pressure data measurements of the aerodynamic effects on the inboard underside of the wing near the nacelle and pylon for an Ultra High Bypass (UHB) nacelle. Image Credit: NASA Facebook Pinterest X LinkedIn Email https://www.nasa.gov/image-detail/697361main_acd08-0108-001_1600-1200_full/Copy URL to clipboard> DownloadShareTagsWebMod GrandfatheredImage CreditNASASize1600x1200px