At 20:52, I input a weight of 10 for the second aileron. This is a mistake. Because we are assuming that the aileron servos are set up inverse of each other, when the weights are the SAME (both positive or both negative), the ailerons will move OPPOSITE each other. Therefore, if we want spoilers, where both ailerons stick up, we need the weights to be DIFFERENT (one positive and one negative) so that the ailerons move the SAME direction. In other words, one weight should be 10 and the other weight should be -10. This will cause both ailerons to stick up 10%.