that's a loaded question. it really depends on the conditions of your boat, weather, and crew(if any). and especially YOUR experience. when i am singlehanding i can sail to about 20knts, but this is a major work out sheeting in and out and just fighting it trying to stay right. i just had reef points installed to make that 20knts easier. with crew 20-25knts is doable but the water usually is so choppy it brings new meaning to the word 'beat'