So yesterday i got to test an extreme lightwind combo that completly changed my opinion about in how light winds you can foil:
The kite the was Ozone R1V2 17m with 25m lines and racebar, board custom 150x50x8 Carbon (lots of volume) and for the foil i used my Moses with the 550 wing (just because i wanted to try with a foil that im very familiar with). I own myself a Ozone 15m V2 UL, but this R1V2 and this board gives me at least another 2 knots of bottom end, i had the feeling that if i dont needed to change direction i could foil in barely no wind, only when i had to jibe i could realise that its was "no wind", kite colapsing from the sky every single time my board speed went to anything close to zero.
Its amazing! But the skill required to be able to safely foil in this conditions its also very very high because you cannot touchdown at all, or at least if you touchdown it needs to be with some board speed.
After this experience i went back to my normal board and my UL 15m and i could not even stand up on the board, was able to keep the kite flying maybe better then the r1v2, but not enough power spike to lift me from the water.
Wind was never over 4-5 knots, and im sure in some places it went under 3...
Just incredible to be kiting in this wind.