ginger pom said...
Why do you need big winds? Can't you make a landboard using kmart skateboard trucks, bunnings wheels and a drill?
I borrowed one a while ago off H2O. Easily capable of getting going with a 3.7m in an eight knot breeze on concrete
On a hard surface any breeze will do. Less is better for safety.
If using roller blade or skate wheels 5 knots will do with ~4m. Golf buggy wheels, a 5m with 8 knots is more suitable.