![]() ![]() ![]() The Orbis FTT is a circular, constant altitude and constant airspeed turn, flown to gather pitot-static and GPS data for comparison and calibration. He first presented these slides at a symposium in Germany, and it has been used informally in industry and academia for several years now. Orbis Matching is an FTT developed by Al Lawless. The point of this discussion is not to explore all such GPS methods, but it will focus on one promising method that has not yet reached publication. I also mention this paper because of the potential synergy with the Orbis method. Trailing cones are usually subject to lag errors in such a maneuver. For example, this paper suggests that GPS altitude, when correlated to trailing cone data during a constant airspeed calibration run, is a highly accurate truth source for subsequent runs using a level-acceleration FTT for air data calibration-accurate data across the operational (airspeed) envelope in fewer high altitude missions. The maturity of GPS-integrated avionics systems and improvements in applied tools of math and stats have opened a rich area of study for a new kind of air-data calibration FTT. ![]() Many of these papers introduce ideas that improve upon but do not significantly alter elementary flight test techniques (FTTs). A quick and informal survey of the SFTE technical paper database shows that pitot-statics is a frequent subject of symposia presentations, and a cursory glance at the website of the European Chapter shows a similar trend. That brings us full circle to Orbis.Īfter more than a century of flight, air data calibration is still a keystone of the flight test profession. Instead, we believe it can be a laboratory, a place where we introduce ideas that may not be ready for entry into service but will certainly benefit from the rigorous discussion, questioning, and counter-arguments that we expect and hope will blossom following their explanation here. We don’t want FTN to repeat news that was available elsewhere. Finally, and perhaps most importantly, we hope that this feature is more than just a rerun. In this month’s feature, we gloss over elementary pitot-static theory in hopes that you will open the Handbook and dig into the pitot-static fundamentals. Second, we hope to constantly highlight our hallmark resource, the SFTE Technical Reference Handbook. If, as a byproduct, it inspires you to do the hard work of writing and presenting a technical paper at a future symposium, then that is also a benefit. We do this with the hope that you will get value from these papers and that you will appreciate the investment of time and energy from other members who wrote these papers. First, it gives us a chance to direct the reader to the host of technical papers on our website and to highlight papers of particular relevance. Since October, every other issue of FTN has featured a column with technical content, a practice we hope to continue for several reasons. But why should you care, and why do we discuss it here? Orbis is a pitot-static Flight Test Technique especially useful in RVSM airspace that results in a highly accurate measurement of winds aloft (☐.3kts). ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |