I think in this case bigger is not necessarily better.
Note that whether at 3 feet or 9 feet it still has the same wind range.
I E-Mail'd him but no reply yet ...
Big boy -
Hypar 3 Big 3m wingspan, with carbon frame.
Size: 3.00m x 0.71m.
WR: force 1 – 5
Hypar 1 The baby of the them, with fibreglass frame.
Size: 1.00m x 0.28m
WR: force 2 – 5
Further experimentation with the Baby shows you can just increase your line strength ... I went from 20#, to 30# to 50# to keep the kite up in higher winds ... Maybe as ITW suggest it can fly uo to 25 mph with 100# line before it implodes or explodes ...
At 9 feet that is not too OBNOXIOUS for a kite of this NEAT design ...