The results of the wind tunnel test were so good they were unbelievable. Caltech recalibrated its wind tunnel and ran them a second time, and then a third time. When it delivered its report to Consolidated it indicated that the wing appeared to deliver everything it claimed, but Caltech also suggested it might be a wind tunnel fluke, something that gives good results only in the tunnel. This is a common problem since the walls of the tunnel affect the results by increasing the effective aspect ratio, or the Reynolds number used could have been incorrect.