Mike asks: > What is the 'direction of flight' when you are on the ground
> under the wing looking at it? > > Photos I have of my Alon doing low passes at the airfield > show the nose attitude higher than on the ground, but > this was not at cruise speed, so to be expected. Mike, I think the airflow over the pitot tube part of the under-wing will be very parallel to the wing's flat surface. I'd eyeball it from the side, making sure the pitot/static tube is parallel to the bottom surface of the wing. This goes along with making sure the tube is 3 7/8 inches below the wing as per the specifications. Then, I'd stand in front of the wing and pitot tube, trying to judge as accurately as possible that I'm exactly in front of the pitot tube. I'd eyeball the pitot/static tube to make sure it's not bent left or right. There is some installation error in the Coupe's pitot/static tube location but it's pretty minor. As I recall, it's designed to be right on at 100 mph and the installation error at 50 or 55 mph is only about 3 mph from true. That's pretty good. And, as always, you should determine the indicated airspeed at minimum flying speed for your airplane with your airspeed indicator and use that info to judge your approach and landing speeds. Ed
