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Self Steering Mystery

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Brian Morrison21/07/2021 07:01:58
4 forum posts
4 photos

First time on forum, apologies in advance!

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Can anyone tell me how to hook up this mechanism, the model came to me in pieces? There may even be some crucial parts missing?

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Many thanks for any help you can offer!

Richard Simpson21/07/2021 12:16:09
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957 forum posts
255 photos

Not my area I'm afraid but this might just help a little before someone who knows what they are talking about can help.  You are obviously missing the rudder sail and possibly one or two other bits.

By the way welcome to the forum and you don't have to apologise for asking a question!

 

01-06-19-29cadmashowdoncaster29.jpg

Edited By Richard Simpson on 21/07/2021 12:17:15

Brian Morrison22/07/2021 04:00:17
4 forum posts
4 photos

Thanks Richard for your reply. The photo that you posted is an awesome looking craft, a very sophisticated steering looking set-up!

Nigel Northwood22/07/2021 09:19:15
43 forum posts
87 photos

I've seen similar & I've just acquired a very old hull to rig up for simple self steering. Is the rudder attached to the cranked arm or to the post further aft?

Ray Wood 222/07/2021 09:38:51
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2789 forum posts
970 photos

Hi Brian,

Although it looks complicated the theory is the same, I suggest you make a fitting to hold a balsa vane as Richards picture which is adjustable to the heading you want the yacht to take, this was the way of controlling prior to RC being available. And it keeps you fit getting round to the other side of the lake to catch the boat !!

Regards Ray

Edited By Ray Wood 2 on 22/07/2021 09:39:36

Colin Bishop22/07/2021 09:49:02
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Moderator
5152 forum posts
6118 photos
419 articles

If you Google Model Yacht Vane Gear you will see various explanations plus useful diagrams of how it all looks and works. You can then work out what is missing from your boat.

Colin

Richard Simpson22/07/2021 10:05:21
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957 forum posts
255 photos

The more I look at it the more I suspect that, being a relatively simple and old model, that the rope on the main sail attaches to the eyelet at the rear of the tiller arm. Consequently the rudder is simply being used as a means of stabilising the direction by counteracting the pull to either side of the main sail.

Balanced against that the other rope is attached by the hook to the eyelet on the top of the rudder stock with the loop of the rope passed into the split ring on the deck. Balancing the length of the two ropes then allows a limitation of main sail travel and rudder movement for a given movement of sail. The rope at the forward end limits the rudder travel and the rope at the aft end limits the main sail travel.

Just a thought, I might be completely wrong. You might be able to convert this to a balsa sail type of operation as per the vintage yacht picture above but it might be more appropriate to simply operate the model as per the original design intention.

The bottom line is that I may just suspect now that there is nothing missing!

Edited By Richard Simpson on 22/07/2021 10:06:39

Colin Bishop22/07/2021 10:19:34
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Moderator
5152 forum posts
6118 photos
419 articles

I think you could be right Richard, the mechanism does look a bit 'agricultural' and not part of a more complex setup.

Colin

Ray Wood 222/07/2021 10:29:28
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2789 forum posts
970 photos

Hi All,

Yes it could be as simple as that

Regards Ray

redpmg22/07/2021 10:59:07
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186 forum posts
19 photos

Believe Richard is absolutely correct - a simple gear for tying rudder movement to the sail with nothing missing. As it is should always keep the yacht heading into the wind . You would surely have to disconnect the mainsail from the tiller arm and simply limit the travel when using a vane ?

There is a small star on the mainsail boom visible in the second picture - is it possible this is one of the more sophisticated Star yachts ?

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