One thing you dont seem to have taken into account Wouter is the total surface area of the Stealths "T" foils, remember we have 4 (four) foils to an INT 14's 2 (two) so we're probably a lot closer than you think ! Also the Stealth is designed as a "PLANING" cat and the foils are angled to correspond with the optimum planing angle. As i'm from a Motor Racing background the beneficial side of the "T"s caught my attention although i was lucky to have a friend working for a F1 team who advised me on a more suitable section - glad i didnt have to pay for the use of their C.F.D. programming time ! anyway what are friends for ?