So, I was flying with a club CFI for a new member check out on Saturday, and I was demonstrating a slip to him. Now, I was taught that you slip with low wing into the wind. (If you have a slight cross wind from left, you yaw right and dip left wing. He then imparted wisdom to me that slipping to the right resulted in a lower indicated airspeed than if you flying into the wind, and slipping to the left caused the indicated air speed to be optimistic, and you'd be flying slower than it shows you are. And that one should always slip to the right. This happens not because of the effect on the Pitot tube on, but the air flow over the static port, and because the C 172 only has one outside static port. From my perspective, it does not make sense that slipping would effect the static port - it was designed to not be effected by air speed. But it seems that the Pitot Tube will however be affected because you have air hitting the side of the tube more than front on, reducing the pressure and thus reducing your Indicated air speed. Thus, your indicated air speed would be lower than actual. The effect would the same left or right of relative wind direction. In a nutshell, a slip in either direction would not cause an optimistic air speed reading, but a lower reading than actual. What am I missing?