Other threads have explored flat hull shapes and a recurring theme tends to be the limitations of such hulls in both comfort and performance. One frequent poster, who shall remain unnamed but whose name might rhyme with Flames McSullen, feels so passionately about the subject that every time it comes up, he points out their lack compared to more "evolved" round hull shapes to the point where it would seem such hull shapes are not worth building. Is this an oversimplification or is it true? And if true, why are they still being designed? I know build-simplicity might be sighted, but highly respected (even beloved) designers seem to incorporate flat hull shapes into their designs. John Welsford uses it from his smallest to his biggest, the SCAMP and the Penguin are flat or use large flat sections. Iain Oughtred has utilized flats all the way up to his sharpie Haiku. I know Oughtred's use is in a a sort of directed way, (his take on a dory or a sharpie), but that is not the case with Mr. Welsford's. Now James (whoops- the cat's out of the bag) tends to be a quiet, shy, somewhat reticent type, so he is unlikely to respond here (though I wish he would), but I am curious what people think and just how detrimental the use of flat sections is. I'm hoping to limit this discussion to sail or oar type boats as power designs could easily merit their own thread.