I sailed the Ft Pierce inlet this afternoon. Wind was out of the North blowing 25 - 30mph. I rigged a 4.7 on my wave board and Jon was on a 4.5. I am a novice wave sailor so the experience was both awesome and intimidating. Several times on the way out I had no power in the sail with an approaching wave that was about to break. But on the flip side streaking down a wave face fully powered was sweet. Jon said the small sets were probably 6 - 7' and the big sets 8 - 10'