Ah--- pitch stability - I really don't get excied about that -
I just adjust cg for easy control--and extreme pitch--the radio settings of expo make this possible.
these things do fly hands off quite well -- nothing like my
trainer designs but then -I don't expect them to do that.

Ants lake - you have said nothing to "prove me wrong".
I used hypothetical examples to look at the extreme ends of what happens .
Webster's "airplane" is close enough for folk music.
for those who still believe that some textbook airfoil will improve models in the small light foam stuff- I have a very simple answer .
Build one - You make it as good as you can - then show me what facet of flight is improved.
In case anyone forgot. airfoils are designed to a criteria.
In this instance - the criteria is simple: minimum weight for strength and wingloading far exceed any other criteria.