Evil J
Tiss true that some of the older flexwing microlights would struggle in winds of 10 kts and above,only for the fact of having a larger wing surface and smaller power plant than the latest machines.The "quik" flexwing that is very popular nowadays has a much smaller wing and larger engine and is more than capable of speeds above 90mph and is capable of flying in winds higher than the early flexwings.
Chers
Barshifter