Jon Berndt writes: > > 1. Put the X axis origin at the published weight-and-balance reference > > datum. > > 1) Respect the manufacturer's structural coordinates, if known. If not, > place the X axis origin at the published weight and balance reference > datum. If not known, place the X axis origin at the tip of the aircraft > nose or propeller hub - whichever is farther forward (not including probes > or antennas).
The C310 provides an interesting case here, since the later versions have a longer nose -- that's why the firewall might make more sense as a default X origin (or the leading edge of the wings at the root). > > 2. Put the Y axis origin at the centreline of the plane. > > Yes. OK, that's a no-brainer. > > > 3. Put the Z axis origin [where? the ground?]. > > Place the Z axis origin as specified by the manufacturer's structural > coordinate system, if known. If not, place the Z axis origin at the tip of > the nose or propeller hub that the X axis origin is located at. This would > place the origin for the entire axial system at the nose or propeller hub. Sounds reasonable. All the best, David -- David Megginson, [EMAIL PROTECTED], http://www.megginson.com/ _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
