Bill,
That complex cylinder pitot/static tube was the original equipment on the Ercoupes. As far as I know, it carried through all the Ercoupes and, I'd expect, the entire Coupe line. I don't know if it was unique to Ercoupes or if other planes also used it. It has a cup-shaped depression on the front with a central, raised bump and the pitot tube openings are on the sides of that bump. On the sides of the cylinder, equally spaced around it, are static port openings. I'm guessing that this design allows fairly reliable and consistent airspeed readings even when the plane is in a slip. On a plane with a non-Ercoupe pitot/static system, well, you're doing something else. Ed
