Over all I reduced the stall speed by 10 mph. I gained nearly 2 mph I.A.S. reduction in stall speed by the addition of VG’s over the fuselage!
Optimum stall speed reduction was noted with VG’s reaching 2/3’s of the wing span. With this configuration, VG’s were added in front of the aileron gaps, to evaluate roll enhancement. No significant difference could be seen. These were removed and the VG’s were continued to the wing tips. There was no further stall speed reduction, however, at cruise, the wing is so much more efficient, with a lower AOA, that i now get 10 mph more speed at each power setting. Previously, I got 70 mph at 2100 rpm / 80 at 2200 / 90 at 2300 and now i get 80, 90, and 100 mph respectively!
In summary, the addition of the Airwave Micro Vortex Generators to a Taylorcraft L-2B, will reduce the “indicated” stall speed to 30 mph. (Very high AOA, certainly adds to position error), so maybe it’s 32 or 33 mph.