"Jon S Berndt" writes
Exactly.Paul Surgeon wrote:
Shucks ... I must be tired or something because this is getting more and more confusing by the minute.
What is this "arbitrary point" you are referring to?
It is a location which you can choose. You can use the CG, the nose of the aircraft, the center location of the front of the nozzle, anything.
Paul:
Within the FDM our math model really doesn't care about the specific locations of anything .
At the risk of putting my foot squarely in my mouth the FDM does not
care what the model looks like or where it is.The reference point for the
model is usually put somewhere close to the centre of the model so the
model will appear to fly correctly when viewed from a chase position.
The other night I was playing around with a model and forgot to reorientate
it before putting it back into FG.The result being that the nose was were the
right wing should of been and everything else was moved 90deg.So that when
you climbed the left wing went up and when you dived the left wing went down
and when you banked to the right the nose went down and the tail went up.The
A/C flew perfectly and had I not bothered to look from outside the A/C I would not
have knowen anything was wrong.
So if you know roughly where the CofG is for the real A/C that should be your reference
point.
Cheers Innis The Mad Aussi
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