Hi, I'm 105kg and use a iS144/9m in around 10 knots, slow but fun. I'v yet to try my 11m in sub 9/10 knots but imagin it will work well. Overall, iS133 Vs Formula, the minimum wind requiremed will only drop by 3 or 4 knots, I mean the iS will need 3 or 4 knots extra CW Formula to get going. In "solid" 10k winds, the iS will be quicker accross & down wind. Main advantage to the Formula will be up/downwind angles and the sensation of more power (because of wider tail & bigger fins).
Last edited by mark h; 15th April 2008 at 10:52 PM.