The thick tip foil (progressively thicker foil from root to tip) -- was marketed in the Funtana model. (Funtana90 example)
the next version of this model ? right back to progressively thinner .
as a practical matter - in these small aerobats - the airfoil only needs be thick enough to be stiff and fre from load failure.
I had two of the Funtanas. they flew fine - but the so called improved stall feature was simply non existant. it was just marketing hype to the uninformed.