A few days later, however, Laddon changed his mind and convinced Fleet to pay for construction of a model and wing wind tunnel test at the California Institute of Technology. They intended to compare the design to one that had been designed in-house. Initial results of the Caltech wind tunnel tests were disappointing. Test instruments did not support Davis' predictions. However, Davis and others determined that the Caltech wind tunnel's instruments were not sufficiently sensitive to detect improvements from the Davis wing tests, despite being among the most sophisticated of their kind at the time. After re-calibration of the Caltech wind tunnel instruments, tests showed significantly improved readings.