On Saturday 10 January 2004 20:17, Alan King wrote: > Lee Elliott wrote: > > Definitely - I don't think I could accurately position a model to an > > aerodynamic center. > > > > LeeE > > Then your model's relationship to how it flies is just as inaccurate. > It isn't by your or my or anyone else's vote or choice. > > If the NOSE agrees in both, and you haven't gotten the distance from > NOSE to POS correct and exactly the same in both models, then you have a > GEOMETRY error between them when it moves. Try to show me how having the > nose referenced relieves you of having to know and have the same distance > from nose to center in both FDM and the visual. You can't. > > How would you expect the FDM model to magically get it's relationship > from it's nose to where all the calculations are done matched to your > model's visual distance from it's nose to where all the calculations should > be? > > You can use the nose all you like. If your distance from your nose to > the center isn't exactly the same as what the FDM thinks it is, then your > models don't match and your visual is off by just as much as that > inaccuracy you couldn't figure for the POS. > > There is no choice in the matter. The center of the aircraft is the > center of the aircraft and is the simplest point of agreement between the > visual and the FDM, and simplest point of calculations for both. You can > use the nose as a reference point, but you still better make very sure your > nose is the same distance visually from POS as it is calculated in the FDM > if you want them to match. > > Alan
Please don't capitalise words for empthasis - it's irritating. LeeE _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
