where does the model roll?

[Koenig, Tom]

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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