Every cruising sailor I know wants to go fast. Fast is a relative term in sailing. In other words, 6 knots is not exactly the world speed record. One way to get the most speed your boat can give is to use the telltales as a guide. Telltales are ABSOLUTELY the most important sail trim indicators on the boat and no non electronic devise has been developed that approaches their sensitivity and effectiveness.In my book, The Sail Trim Users Guide, I devote about 7 pages to telltales because that is how important I think they are. Most sailors think that there is only one mode – telltales streaming. Actually, there are 5 modes and they are pinching, pointing, full speed, acceleration and footing. If you follow my telltale outline in my book you’ll get pretty good speed from your little beauty but say you want a little more. Here’s what you do with your main and jib.Mainsail: All the mainsail telltales are important but the MOST important one is the top one and that one is the primary guide for judging mainsheet tension and ultimately mainsail trim. Assume your sailing close-hauled. You want to trim the main to get the top telltale streaming. What does this tell you? It tells you that you have a smooth, attached airflow along the entire curve of the sail. With this setup you should be making good speed but you will sacrifice some pointing ability. Let’s say you want to point a bit higher. Trim in the main a bit more until the top telltale just stalls. What does that tell you? It’s telling you the airflow is not attached along the entire curve of the sail. What is the result of that? You’ll point higher but your slower. I’ve never understood why some guys are fanatical about pointing because it is slower than sailing somewhere between pointing and footing.Say you want a bit more speed – try this, trim the main to a point where the top telltale streams about half the time and is stalled half the time. You should pick up extra speedNext time your on the water try my suggestions and see if they work for you. If they don’t, just go back to what you were doing previously. Next session I’ll discuss jib telltales.