where does the model roll?

[Bill Glaze]

Jim:
True.  The C.G. is much more than the common point we use to balance our
aircraft.  It is actually, as I'm sure you know, a point in space that is,
generally, depending on design, not reachable by normal means.  On most
"normal' configuration of monoplanes, somewhere inside the fuselage.  Rotation
is considered to be about this point.

Bill Glaze


JOddino wrote:

> ----- Original Message -----
> From: "Koenig, Tom" <Tom.Koenig at actewagl.com.au>
> To: "'Discussion'" <discussion at nsrca.org>
> Sent: Wednesday, January 08, 2003 3:31 PM
> Subject: where does the model roll?
>
> > Hi Guys,
> >
> > I've just been asked this question.........it never occurred to me to
> really
> > think about this, now I'm open to opinions, facts and anyone that has the
> > cold hard knowledge.
> >
> > I have always assumed that a model rolls around the datum line ie: the
> > crankshaft center line (not taking down and side thrust into
> consideration)
> >
> > Now a mate of mine swears black and blue that in actual fact the model
> rolls
> > around the wing center line ie: it is the wing that rolls and all else
> > scribes an arc around this.
> >
> > Can anyone can set us straight......please?
> >
> > Thanks
> >
> > Tom
> >
> I'll say it rolls around the cg but how many of you know where the cg is
> along the vertical axis?
>
> Jim
>
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