On Sun, 2007-02-25 at 16:19 -0700, Dave Perry wrote: > What is contested is how to model the baro shift. What you suggest is > retrieve the indicated altitude and then subtract the PA to get the > "encoder baro shift" and then add back in the PA. This means the > kap140.nas has to retrieve the value it cannot have in reality > (indicated altitude) and wants to approximate from values it does have > (PA and baro shift), and then create the value it needs to approximate ^^^^^^^^^^^^^^^^^^^ Correction: "values it does have (PA and baro setting)"
> (baro shift) from values it has by subtracting the PA and then add it > back in??? This is very unrealistic! The code to compute and save the > baro shift using the atmos model is one line in c++ and uses a function > I cannot call from Nasal. (see below). > > Summary proposed compromise: > 1) Use an encoder instantiation (altimeter[1]) with quantum = 10 as well > as altimeter[0] with quantum = 0. > 2) Leave the 5 new lines to allow unambiguous service to autopilot use > of the encoder. > John, if you don't like the added 5 lines, why not just put the kollsman shift on the property tree? Then any autopilot can approximate the baro shift by putting the baro setting to /Instrumentation/altimeter[1]/setting-inhg and picking up the kollsman shift for the baro shift. At the start of this discussion, I thought you wanted just one model of the atmosphere. So it is a bad idea to have each autopilot use it's own model. Users are going to want to ignore different returned values for different instantiations for "realism" reasons. Regards, -- Dave Perry ------------------------------------------------------------------------- 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 Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
