How would you fit a windvane to something like a moody s38, or similar?

Which windpilots can sail true wind downwind?
I was using mine (Sailomat) for exactly that a fortnight ago - though in truth for only an hour or so and in benign conditions, but it coped admirably. I’d been thumping around coming out of the Deben and a terminal had popped off the TP feed on control panel. Poor maintenance on my part really. Have checked all connections since then and re-crimped a few.
 
FWIW, I have yet to find **one** cruiser using wind steering (after of course having learnt to use it) which is unhappy with it, the choice is very easy they are all good: Hydrovane Monitor Windpilot etc.
IMHO the ARC is (very) far from being representative of general cruising habits, most of the participating boats are equipped on the lines ''shopping list for turnkey sailing'', people fit the full list the whole lot of equipment they have been convinced is ''must have'' from sailing magazines, blogs and the like, they usually install everything during the few weeks before the start then leave. No wonder sailing magazines articles after the rally are lists of ''what worked and what did not''; no wonder there are few wind steering systems, no wonder people haven t had the time to learn to use it and blame it as ''faulty'', an autopilot is immensely easier. For example, a walk in the Azores marinas during the return transat season shows a completely different picture wrt wind steering.
Besides, the time spent while looking at what other people do or do not to try and find this ''general consensus'' is IMHO much better spent reflecting about what kind of sailing provides most satisfaction to one s self, and follow that direction: it goes from choosing a boat to equipping it, to choosing places to sail to, etc etc; why on earth one should look at what the ''consensus'' is, if it ever exists. Many ARC people are very happy with what they do, there are many people equally happy doing things in totally different ways. :)
We have found that the boats that all converge on Horta in the Azores in May/June, having crossed from the Caribbean, are generally a different style of boat to those that cross on mass on the ARC on the way out. There are more older style boats with wind self steering, single handers, smaller boats and boats that are more at home at anchor than in a marina. There are also far less catamarans
 
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I've got fairly extensive experience of tillerpilots, quadrant mounted autopilots, servo pendulum windvanes, and auxiliary rudder windvanes. So possibly qualified to make a comment or two.

If I was forced to pick one system only? Below decks quadrant mounted autopilot. They are very very good. We've never even set ours up to steer to the wind, so I know it can be made even better.
The only time I would consider it necessary to add a supplementary system would be on lightly crewed long offshore passages, where a windvane provides possible redundancy in case of a failure in the autopilot or the means of charging it.

We used a Hydrovane for the majority of our E-W Atlantic crossing, and it was reasonably good. I found it much less able to cope with changes in wind strength than either the autopilot or the servo pendulum system we'd used on a previous boat. It simply doesn't have the power of a servo pendulum system, meaning that sail and helm balance is vital. Perhaps it was just our boat, but we found that if the wind picked up it was necessary to dial in a bit more helm to prevent the boat from rounding up. When the wind eased, you had to adjust the helm again or you'd risk going too far off the wind. In steady conditions it was very good, although it did weave around a bit. We generally had to reef the main earlier than usual in order to get the boat balanced, so there's a slight speed penalty there.

The upside is of course the second rudder, and lack of lines in the cockpit.

On our new boat we have a steeply raked sugar scoop stern with overhanging davits and solar panels. I don't think I'm going to fit the Hydrovane. It would get in the way too much, it would prevent us from using the davits, and I'd need very long tubes for the top support. All rather cumbersome.
Instead I will keep an entire spare autopilot system in storage, along with my 60Ah lithium battery which I use for odd jobs. In the event of a lighting strike or similar, hopefully I could be up and running again in an hour or two. And then the battery should give me a few hours of steering while I figure out my next move...
Being centre cockpit, our Windpilot control lines to the wheel are about as hard to achieve as it gets. They run along the aft deck, via an Aries block in the cockpit, to the wheel.
All servo pendulum wheel steering is designed for about 2 turns lock to lock. Our wheel is over 3 turns lock to lock as it needs the gearing to move the large rudder. Fitting a servo pendulum system to a boat like ours won't work well straight out of the box. You simply don't get enough steering wheel movement. We solved the problem by adding 1:2 pulley blocks to our system. This doubled the amount of turning. It's amazing to see the wheel spinning in response to quartering seas. The Windpilot is more than powerful enough to deliver this solution.
We find that sail trim to balance the boat is not critical. Comparing experiences with friends with the same boat that use a Hydrovane, they need to be more conscious of sail trim
 
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Thanks, all. Was just curious as something similar may be my next boat, and would have had to rule them out if it was an issue. But not until I finally finish and use the one I have on the hard in bits :)
If or when the time comes ask again
I fitted a Hydrovane to my last but one boat and A on starboard side so clear of the centreline and B slanted it athwartships by 10deg or so and ‘made adjustments ‘ to the vane, weight and linkage
It worked beautifully
I would have to dig for pre digital photos to scan
 
I was using mine (Sailomat) for exactly that a fortnight ago - though in truth for only an hour or so and in benign conditions, but it coped admirably. I’d been thumping around coming out of the Deben and a terminal had popped off the TP feed on control panel. Poor maintenance on my part really. Have checked all connections since then and re-crimped a few.
You were sailing apparent not true.
 
You always sail apparent wind. The only time direction of true and apparent are identical is when you’re dead down wind. It’s still an apparent wind though as true wind speed would be apparent plus boat speed. (I’m ignoring tidal stream here).
With reference to true wind direction. Like my autopilot does off the wind.
 
I’m not sure what point you’re making?
I think what he’s saying is that a windvane won’t perform as well as a autopilot when you have, say, 4 knots of breeze right up the chuff, and the near-zero apparent wind over the vane is not enough to make it function correctly to steer boat.
 
I think what he’s saying is that a windvane won’t perform as well as a autopilot when you have, say, 4 knots of breeze right up the chuff, and the near-zero apparent wind over the vane is not enough to make it function correctly to steer boat.
My boat doesn’t sail very well in four knots of wind. It sort of drifts.
 
My boat doesn’t sail very well in four knots of wind. It sort of drifts.
Same. Not many boats will sail well in 4kt AWS from dead astern.

We recently saw those conditions and were in company with some large cats equipped with fancy downwind sails (and one was crewed by expert ex racing sailors). It was interesting that none of them bothered turning off their engines and playing with the fancy sails.
 
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