I think the main mistake we made was that we tapered our wing a little too much and kept the airfoil constant. So the Reynolds number of the root of the wing was almost twice that of the outside of the wing with the same foil. So as we got close to the stall point the lower Re section stalled slightly before the root and that is why we had to add washout in the second wing to fix the problem. Also the tip was flying at, if I remember right, an Re of about 80,000 which was too low for the E432 (?) airfoil we were using.

Sound right?