where does the model roll?

[John Ferrell]

IMHO:
The airplane that rolls around the thrust line presents better for our
purposes.
The location of the neutral point, cg and center of lateral area appear to
play a part as well.
You have a measure of control with the shape and positions of the ailerons.
You can usually influence the roll axis with aileron differential.

I obviously don't really understand the subject because I cannot quantify
it!

One reason the Snaky airplanes like the Prophecy were such a success is that
it about impossible to get the neutral point and the CG too far from the
thrust line or the wing center line.

I never saw a flyer that was happy with a Hydeout that had a big tank
stuffed in the canopy area.
It is another condition to consider with the wide bodies that are so popular
now.

John Ferrell
6241 Phillippi Rd
Julian NC 27283
Phone: (336)685-9606
Dixie Competition Products
NSRCA 479 AMA 4190  W8CCW
"My Competition is Not My Enemy"



----- Original Message -----
From: "Koenig, Tom" <Tom.Koenig at actewagl.com.au>
To: "'Discussion'" <discussion at nsrca.org>
Sent: Wednesday, January 08, 2003 6:31 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
>

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