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
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