Norman Vine <[EMAIL PROTECTED]> said:

> xorig = fuselage length / 2

What if tail surfaces extend beyond the fueselage?

> yorig = wingspan / 2

Ok got that.

> zorig = highest point / 2 < usually top of tail >

Is that with gear up or down?

> 
> obvious enough for me :-)
> 
> Main Entry: 1cen�ter
> Pronunciation: 'sen-t&r, 'se-n&r
> Function: noun
> Etymology: Middle English centre, from Middle French, from Latin centrum,
 from Greek kentron sharp point, center of a circle, from
> kentein to prick; probably akin to Old High German hantag pointed
> Date: 14th century
> 1 a : the point around which a circle or sphere is described; broadly : a
 point that is related to a geometrical figure in such a
> way that for any point on the figure there is another point on the figure
 such that a straight line joining the two points is
> bisected by the original point -- called also center of symmetry b : the 
center of the circle inscribed in a regular polygon
> 

14th century?  The aircraft wasn't invented yet.

Now I'm really confused!

;-)

Best,

Jim

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