wind tunnel tests continued through this period. in november, john k. wimpress again visited langley looking for an update on nasa's own usb program. joe johnson and dudley hammond both reported on testing and showed wimpress data that verified the high-lift performance that boeing had quoted in its proposal. by december 1975, boeing and nasa langley had arranged a contract for a full-scale usb testbed, which boeing built at their tulalip test facility consisting of a 1/4-scale wing with one jt-15d engine and a partial fuselage. langley was particularly interested in the effectiveness of the d-shaped nozzle that directed the jet flow over the upper surface of the wing, as well as the resulting sound levels, at that time a major focus of nasa's civilian aerodynamics research.