[quote=Dogboy]Adding to what others have said - I would not fixate too heavily on the middle telltails. On a sloop rig, the telltails in the body of the main tend to be pretty useless. The upper telltails on the main and the two sets on the jib are the ones to watch.
In my experience, the telltails in the top third of the main are most critical. I would put one or two sets in the upper panels. Your sail will stall from the tip down. If you are looking for power, just watch the upper telltails and if the windward is streaming up, then you can sheet in more. If the leeward is streaming up or forward, then you’ve overdone it and you need to immediately sheet out to reconnect flow. This will eventually be able to be done almost entirely by feel and you’ll only need to refer to the telltails in light conditions when it’s easier to stall the sail.
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