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"Michael" wrote in message om... http://avionicswest.com/articles/kno..._autopilot.htm That's not a bad article. I do have some issues with it. First off, it ignores the most important difference between rate-based and attitude-based autopilot - performance in turbulence in a slick airplane. Attitude-based autopilots (those that use pickoffs on the horizon gyro) work all the time. Rate-based autopilots (those that use pickoffs on the turn coordinator) work in smooth air or with light, draggy airplanes. In a heavier slicker airplane, especially a twin, turbulence makes for a very uncomfortable ride because all the corrections are too much too late. There are NO rate-based autopilots in the transport category - they just wouldn't work. You might want to take a gander at this article. I'm not sure what you mean by slow corrections, but evidently S-TEC (taken with a grain of salt) has optimized the corrections, as well as smoothed them to avoid overstressing the aircraft in turbulence. See Pages 6 & 7. http://www.s-tec.com/pdf/autopilotbook.pdf Matt --------------------- Matthew W. Barrow Site-Fill Homes, LLC. Montrose, CO |
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