Yes, I think the pitot is properly positioned.
I just got the wings re-covered. The ASI had only the normal constant error before the new covers. We put the pitot back just like it was before, to the best that we can discern. However, the ASI performance is much more erratic, now, Dave W This document is for viewing and use only by the intended recipient. If this document is received in error, please notify the sender and destroy it promptly. Winters Patent Law Offices, 2277-C Suite 237 Wilma Rudolph Boulevard, Clarksville, Tennessee 37040-5898, United States of America, Telephone: 931-906-4445, Facsimile: 931-906-0131, <http://winterspatentlaw.com/> http://WintersPatentLaw.com -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of kgassert Sent: Monday, March 09, 2009 11:29 AM To: [email protected] Subject: [ercoupe-tech] Re: AIRSPEED ERROR Is the pitot tube at the proper distance from the bottom of the wing? Kevin1 --- In ercoupe-tech@ <mailto:ercoupe-tech%40yahoogroups.com> yahoogroups.com, "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 >
