Where to place 'telltails'? There is no strict rule as to placement of 'telltails' other than they are placed along the luff of the sail. Most sailors, on the main sail, will set their 'telltails' about 6 inches in from the luff at the one third, one half and two third points of the sail.

On the jib, place telltails about 4 inches in from the luff. Start with placing a tell tail at the mid point of the luff. Then place a tell tail at the midway point from the center luff to the head of the sail. Place a third tell tail at the midway point between the foot of the sail and the midway point of the luff. (See Diagram)

You can buy 'telltails' or you can make your own using sail tape and machine washable wool. Make your telltails between 6 inches (small boats) to 10 inches (larger boats) long. Use red and green strands placing the red on the port side of the sail and the green on the starboard side. The reason for this is that it is often difficult to tell which 'tell tail' you are looking at, espcially when the sun is backing the sail. Colour coding your 'telltails', will help you distinquish which side of the sail you are looking at.

Why do we want or need 'telltails'?

telltails are a sailor's best friend for determining how efficient the sails are working from top to bottom. If you upper inside tell tail is streaming but the lower inside tell tail is luffing, this tells you that the lower part of the sail is not at it's optimal shape and the sheet needs to be tensioned until the lower tell tail starts streaming.

The diagrams below will help you understand how 'telltails' work.

Ideally you want the 'telltails' flowing straight back (streaming) with the sail. (see diagram 1) This tells you that the sail is properly trimmed for your present point of sail.

If the mainsail has been eased out too far, the 'tell tail' on the inside of the sail, will start to flip up and down. (see diagram 2) This tells you that the mainsail needs to be pulled in until both 'telltails' start to stream.

If the mainsail in too tight, the outside 'tell tail' will start to flip up and down signalling that the mainsail needs to be eased out. (see diagram 3)

Remember, when you sail close to the wind, (close hauled), the sails need to be pulled in tight to the boat. The mainsail should be hoisted as high as it will go. The cunningham, which controls the tension on the front corner (tack) of the sail, should be fully tightened. The outhaul, which adjusts the tension of the sail along the boom, should also be tightened. The idea is to create a flat sail.

When you start to sail down wind you do the opposite. You want a sail that is out and more rounded. This requires easing tension on the cunningham and the outhaul and possibly easing the mainsail halyard a few inches.

Watching your 'telltails' will let you know if you are doing the right thing.

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