I just saw, the "Junk Blue Book" is not in the library. Here it is:

https://indigenousboats.blogspot.com/p/junk-blue-book.html

Alex

Anonymous wrote:

Anonymous wrote:

A rudder, slightly raked. I am still thinking about a proper way to hoist it, I will have to use ropes, as Chinese did.

I guess a good question is how "authentic" you wish to be. That is, would it be ok to use a modern-ish winch to lift the rudder? Does the rudder have to be floating, held by lines to keep it in place? Using a very long hinge pin and a rudder with no balance could provide a stable enough (for a small craft) anchor in both raised and lowered position.  Balance could be provided as well if the rudder is split but the mounting would probably have to be metal to do it. I said winch, by which I meant a boat trailer kind of deal with a forward facing crank but I realize now that a block and tackle would probably work just fine. What I can see in my mind would allow 45 degrees port and stbd. I am assuming that the tiller would move up and down with the rudder as the originals seem to have. The lower position being the comfortable position and the up position being for beaching or avoiding grounding.

I have added a rough file trying to show what I mean.  The rudder is shown in it's down position. I have not shown a proper sheer shape or the hull sides that would extend beyond the transom. The blue line is the hauling line for raising the rudder. I have not added the balance option because it does not see that was common in the originals. The hauling pulley should be as close to the centre line as it can be without interfering with the rest of the rudder works. The weight of the rudder would determine if extra mechanical advantage would be needed for lifting or if some form of line to pull it down against flotation was needed. George Buehler's assertion that there should be a good amount of play in the hing is probably worth following. Regular scraping of the pivot pin would be part ones routine for keeping things moving, the fact that this one moves up and down means the whole pin can be examined and cleaned regularly unlike the normal setup. The rudder is attached to the hinge pin only at the very top and bottom, though I am guessing it would be possible to add a third attachment point between the lower and top hull anchor points if they were far enough apart. I think for this size craft it would not be needed.

I would surely consider a system as you suggest.

I know some boats in the Adriatic area had rising rudders on pins.

I will try something in this direction also.

Anonymous wrote:

A rudder, slightly raked. I am still thinking about a proper way to hoist it, I will have to use ropes, as Chinese did.

I guess a good question is how "authentic" you wish to be. That is, would it be ok to use a modern-ish winch to lift the rudder? Does the rudder have to be floating, held by lines to keep it in place? Using a very long hinge pin and a rudder with no balance could provide a stable enough (for a small craft) anchor in both raised and lowered position.  Balance could be provided as well if the rudder is split but the mounting would probably have to be metal to do it. I said winch, by which I meant a boat trailer kind of deal with a forward facing crank but I realize now that a block and tackle would probably work just fine. What I can see in my mind would allow 45 degrees port and stbd. I am assuming that the tiller would move up and down with the rudder as the originals seem to have. The lower position being the comfortable position and the up position being for beaching or avoiding grounding.

I have added a rough file trying to show what I mean.  The rudder is shown in it's down position. I have not shown a proper sheer shape or the hull sides that would extend beyond the transom. The blue line is the hauling line for raising the rudder. I have not added the balance option because it does not see that was common in the originals. The hauling pulley should be as close to the centre line as it can be without interfering with the rest of the rudder works. The weight of the rudder would determine if extra mechanical advantage would be needed for lifting or if some form of line to pull it down against flotation was needed. George Buehler's assertion that there should be a good amount of play in the hing is probably worth following. Regular scraping of the pivot pin would be part ones routine for keeping things moving, the fact that this one moves up and down means the whole pin can be examined and cleaned regularly unlike the normal setup. The rudder is attached to the hinge pin only at the very top and bottom, though I am guessing it would be possible to add a third attachment point between the lower and top hull anchor points if they were far enough apart. I think for this size craft it would not be needed.

Hello

Scrolling in one of Audemards books I fond the attached picture. The board at the stern is not ment for steering but it could be alternated for that. Sliding it up and down one could still steer with it.

Alex

Arnewrote:

Very interesting.
However, I think the writer made a mistake when classifying the steering device on Viking ships as “steering oars”.

Steerboard, for the original right hand steering (is that were right hand steering in cars came from?). Apparently also on Egyptian ships (two point attachment). Of course one would not want to foul the steerboard on the dock and so were always moored with the steerboard away from the dock so the side at dock was the Port side.