On Fri, 2004-01-09 at 17:29, Paul Surgeon wrote: > On Saturday, 10 January 2004 00:35, Erik Hofman wrote: > > No, sorry. AC_EARORP is the published offset from CG to where the forces > > act. For the F-16 that would be 35% chord (and CG is 25% chord). > > Just *maybe* I got it this time around. :) > > So any distance in the FDM is just an offset from (0,0,0)? > > If that is true I could offset all the distances in the FDM by an arbitrary > value (let's say 1000 inches) and the FDM will still behave the same? > I could pick a point 10 meters in front of the plane and measure everything > from there too. > In fact I could define all the distances using negative values as well > (thinking in terms of 2nd Cartesian quadrant).
The _only_ thing that matters in JSBSim is the direction that is positive for each axis. Positive forward, right, and up for the coord system used in the config file. > > The way I'm understanding all of this is that the nose of the aircraft CAN be > used as the origin of the FDM but doesn't have to be. Yes. > I could just as well work from the tail and just enter negative offsets. > > Correct? Yes, yes, yes! > > Paul > > > _______________________________________________ > Flightgear-devel mailing list > [EMAIL PROTECTED] > http://mail.flightgear.org/mailman/listinfo/flightgear-devel -- Tony Peden <[EMAIL PROTECTED]> _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
