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  #11  
Old 11-27-2011
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duchess of montrose is on a distinguished road
how are the mister vanes and since they own navik what about a used navik vane
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Old 11-27-2011
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This may help explain how a servo-pendulum vane gear works. Generally accepted as the most efficient.
NORVANE Self-Steering Wind Vane. Stainless steel, servo-pendulum. Powerful, sturdy and reliable for sailboats 20’ to 60’
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  #13  
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I don't think they own Navik - they are out of business. But they do supply parts they make for the Navik.

Here's a good explanation of Navik from Scanmar, who used to sell it - they make the Monitor.
http://www.selfsteer.com/products/navik/index.php
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maybe its a little more complicated than i thought so the idea is if it veers of course the wind pushes against the paddle which turns the gear which in turn both turnes the tiller and adjusts the trim tab...hmm it does sound rather difficult to design myself would i save anymoney designing by hand vs repairing a frozen up one anyways if not or not dsignificant then i might as welll search for a frozenn navik it seems small and simple enough to be cheap but strong enough to be reliable but where can i look for one i checked craigslist and kijiji and the chandelry where i live wont actually sell anything usefull although if u ever feel the need to have a 14 inch chartplotter they do have those and my boat lives rather in the middle of nowhere atm so no good chandlery or consignemtn store there either and i checked ebay too
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Hey

Below is a forum dedicated to the topic, windvanes and the building of them;
Cruising Sailor • View forum - Windvane Forum

Walt's site is very worth-while, sadly he passed away several years ago so the site is an archive, not an on-going/regularly updated site of his work.

Good luck.

John
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With a Servo pendulum vane, the airvane is set when you are on course. As the boat moves off course the airvane pivots down to one side or the other. When this happens the paddle in the water turns and the force of the boat's movement against the paddle swings it to one side or the other, creating the force to bring the boat back on course with the lines to the tiller.
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oh ok so pretty much the lines are attached to the in water part of the gear, which is in turn connected by a gear to the airfoil, that makes sense so how does that compare to the vertical vane and why is it better like for example a hasler according to theat book is a vertical vae and it looks simmilar except without the gear thing
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and oh ill be sure to check that forum out
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Might also look at John Letcher's "Self-Steering for Sailing Craft" - long out of print but I got one from Amazon's used books; he covers the engineering part and shows many simple ways to accomplish self-steering including wind vanes
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The early Hasler vanes were vertical pivot on the vane. Most like the Monitor, Norvane, and many others use a horizontal pivot which is more sensitive in light winds and the vane can be smaller as a result. Here is a picture of a Norvane on a 28' Triton and while you can't see the entire unit you can see that the wind blade is quite small but it is very effective in lighter winds. Below it is a distance shot of the same vane on a CT34.
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