I completed testing of your Stolspeed VGs on my LM1-2PW. This is 75% wooden Supercub, powered by Jabiru 2200.
My new min speed (Vs) is now 10 kmh less than without VG.
Stall is just not happening. Airplane is slowly transitioning into mushing.
I also put VGs under Horizontl stabilizer. But here I can not see much improvement. Should work more on it.
Few pictures are following.
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