Reading the excellent treatise on making a pitot-static system raised a question in my mind. In the article the author refers to the effects of taking static pressure from the interior of the cockpit. I do that with my encoder and although my read-outs always closely match my actual altitude, especially since I sent the unit back to the factory for calibration, controllers sometimes complain that my readout is "jumpy".
The author suggests that static pressure will fluctuate due to vents being opened or closed. I don't open and close vents randomly and nobody else does either except for those kids three rows up who are bored and have to play with all the buttons and knobs so I'm not sure why taking static pressure from my cockpit would cause jumpiness in my Mode C, but it's worth looking into. It's easy enough to include the encoder in the static line so I'll do that next time I have things apart. I like keeping controllers happy. Mike KSEE ____________________________________________________________ 53 Year Old Mom Looks 33 The Stunning Results of Her Wrinkle Trick Has Botox Doctors Worried http://thirdpartyoffers.juno.com/TGL3141/4ff90dcd6fb14dcd6118st51vuc
