I took this footage today in a very underwhelming southeasterly. It was about 4 to 8 knots of wind I guess. This is still the Mose foil but with the 639 race front wing. It takes off at about 13 to 14 knots of speed compared to 10 to 11 for the 683 front wing. The difference is stability at speed. When I start hitting the 20 knot mark on the 683 it's brown trousers time where as the 639 feels nice at speed.
The gear is my falcon 170 formula and a mach 1 10.5 metre. If you're wondering why the 10.5 the answer is downwind. I can very low even in the light stuff. The small front wing feels fine with the big gear. The common denominator seems to be the speed the wing lifts off at. In my case about 13 to 14 knots regardless of gear.