Is the pitot tube at the proper distance from the bottom of the wing? Kevin1
--- In [email protected], "David Winters" <winterspatent...@...> wrote: > > All, > > I know the old airspeed indicators tend to read high. Nothing new there. > But I have a particularly flummoxing issue. > > To check out my ASI, I took my bird out on a quiet, no wind day and did high > speed taxis on all four cardinal headings. We taxied on each heading up to > 80 mph indicated, cross checked against the GPS groundspeed, and charted the > results. Then, we averaged and interpolated the charts. The charts showed > nice straight-line slopes. The error was constant with no curves at all. > The airspeed indicator readings were nearly dead-on 10 mph high at all > speeds. So, we also extrapolated the speeds up to cruise and charted them > also. > > > > In short, our calculations indicated that the airspeed would always read 10 > mph too high. No problem. > > > > But, then, when I got into the air, my airspeed readings on all headings > easily varied up to, and over, 20 mph too high. Apparently, something > happens once I get off the ground, or maybe out of ground effect. I > hesitate to buy a new ASI because my guess is that the problem is not in the > instrument itself, otherwise the error would be constant. > > > > Anybody have any ideas.or must I fly up to Springfield and harass John > Wright for assistance? (Anything for an excuse to fly up and meet you > John.) > > > > Dave Winters >
