From: John Denker > I don't know of any "environment" variable relevant to altitude > other than /environment/pressure-inhg. Using that bypasses the > lag associated with the /systems/static/pressure-inhg which > seems like a small and unimportant part of the overall air-data > task. It also bypasses the /systems/static/serviceable check, > which seems like a bad idea.
True. But the servicability of air data goes as the whole system - you'd probably be better having a servicability flag for the whole thing. I don't think you can have just the altimeter portion of an air data installation fail, unless you're asserting that the display piece broke. > There is no reason to have a long lag in the static system. Interesting point, yes, you're right. On the modern instruments, anyway. Maybe the old lag was actually due to manufacturing tolerances and the like. > Let's just get rid of the long static-system lag. Maybe the long lag should be a non-default option, used in old aircraft. > Really? I know that's how an IVSI works, but I've never seen an > altimeter that did that, or needed to do that. Yeah, although I recall the transition to precision altimeters having some funny gizmo to get rid of the old lags, I don't recall the details ... and am just assuming they used the same technique as a IVSI. Sorry, can't help there. > Compared to an altimeter, a VSI has a much harder problem. Yeah. But that VSI lag has a different origin due to the instrument being inherently a single pole high pass filter. --- [This E-mail scanned for viruses by Declude Virus] ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Flightgear-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/flightgear-devel
