Download it here. The app is searchable in the Google Play Store under Sailboat Owners.
Sorry iPhone/iPad users, we are still waiting on Apple. :(Click the X in the upper right corner to make this go away
The luff of the jib and the leech of the main are the key points, the belly of the main is useful that's about it. There's a good discussion of telltale use in@Don Guillette - Do you have suggested locations and how many on a Genoa and a Main? I have 3 on my Genoa, located at a point on the sail where there are "clear" windows. There are none in the bulk of the sail and I could see how more would tell you more info for sail trim. On the main I only have tell tails on the leech of the sail at points where there are loops at the battens. Seems it would really be useful to have some on the face of the main in the belly at different heights and possible further aft between the belly and the leech.
I have your book and trim guide sheets but they are on the boat and am away from there right now. I have the genoa out for inspection and some restitching and it would be a good time to add them. I can do the main as I hoist it on a calm day.
Ship Mates: 2021 has got to be a better year. Nothing could be worse than last year.
The community we live in (4500 homes) is working with the state of AZ to distribute the vaccine and my wife and I received the first dose on 1/23/21. The vaccine is a tremendous step in the right direction to beating Covid. Even though we get our flu shots each year sometimes I get a touch of the flu but I'm able to shake it off in about 3 days. In mid February, 2020 I had all the Covid symptoms but our doctor told me it was the flu. If it was the flu I've have never been that sick in my entire life and it lasted for over 10 days. I didn't go to the hospital because that's where all the sick people were and they weren't admitting anyone anyway. I survived but Covid takes a lot out of you and it takes a lot of time to fully recover.
Enough about Covid - lets talk about telltales. Telltales are absolutely the most important sail trim indicator on the boat. No non-electronic devise has been developed that approaches the sensitivity and effectiveness of telltales on the mainsail and jib. Sadly, a majority of sailors do not have telltales attached to their sails. I feel they are so important that I devote 5 pages to them in my book THE SAIL TRIM USERS GUIDE. Telltales are the first thing I look for on any boat I go on. I even carry a extra set with me in the event the boat is lacking telltales Any conversation I have with sailors regarding sail trims starts with the question "do you have telltales?". I don't know how anyone can trim their sails to 100% efficiency without them - I can't and I know what I'm looking for!!
Telltales not only indicate the direction of the wind but how the wind is moving over the sails. On a masthead rig, the jib is the engine - on a fractional rig it's the mainsail. Telltales will indicate if the wind is flowing evenly over both sides of the sail. If one side is flopping around it creates a sail trim problem that needs to be corrected by either changing course or or trimming a jib sheet. The course change or jib sheet trim will depend on which telltale is flopping.
There's so much extra you can do with your telltales once you understand what they are telling you. Such as are you sailing too low or high plus they can indicate a full speed setting, extra pointing and extra power settings..
In my opinion "telltales are absolutely the most important sail trim indicator on the boat".
Stay safe and the sailing season is just around the corner.