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Originally posted on 木造和船 中山幸雄の世界:
御先船 麒麟丸（御召小早三十二挺立） ? 小早 住吉丸（御供小早三十挺立） 箱型八挺立川船 ? 引御船無屋形二十挺立 ? 八挺立押送型船 ? 三挺立御鳥船 ? 八挺立小碇船・大碇船 ? 八挺立水伝馬船 ? 十挺立御供船 ? 十二挺立伝馬船 ? 十四挺立箱型船
This is the completion of my 1/10-scale model of the 15-shaku ayubune. This began with the cutting of the beams. I made the smallest beam at the bow, called the tsunatsuke, 1.5-sun square. The other two main beams I made 3-sun wide and 2.5-sun thick. I didn’t have any sugi of the necessary thickness, so I had to use two pieces glued together. I put the seam on the side of the beam in hopes that would make it less visible.
I used the beams as a guide to help me size the cutouts in the hull, which I cut with my Japanese Hishika, Super Fine Cut Saw, that I got from Zootoyz. It worked really well for this.
I found a supplier with the exact same saw in the U.S., but the cost for the saw was more than what Zootoyz charges, even when you add the international shipping. The one thing with this saw is that it cuts so easily, you have to be careful not to cut too much. For the final trimming of the notches, I used a scalpel.
First, I notched out the hull for the bow platform, called the omoteamaose, and the stern platform, called the tomoamaose. These were the easiest to deal with, since they are at the ends of the boat. So, I dealt with these first.
It was simple enough to add the omoteamase using a 3mm wood. I pre-cut the piece to roughly the correct size by inserting the piece into place and tracing out the extents in pencil. I could then glue the piece into place and sand away any excess using a large sanding block. Continue reading
Progress continues with my 1/10-scale model of the 15-shaku boat used on the Hozu river, northwest of Kyoto. I’m 6 months into the build, but I have certainly not spent a great deal of time in actual construction. Mostly, I’ve been contemplating how I was going to accomplish each task of the build. Things are progressing quickly now.
With the new fixture holding things in place, I taped a piece of cardstock into place to trace the shape of the hull planking. I rough marked the outlines of the bottom, bow plank, and transom on it. The planking will be cut oversized, so getting the exact shape isn’t really necessary, except to make sure that the wood I cut is large enough, but not too wasteful of my limited wood supply.
Next, I cut four straight strips of 3mm sugi on my table saw about 1 shaku wide and 16.5 shaku long. There are two hull planks on each side of the boat, but unlike many other wasen designs, the planks fit flush together, so the sides of the boat are perfectly flat. So I glued up the planks into two side-by-side pairs.
When the glue was dry, I traced the pattern outlines onto the planking in pencil and then cut them out a little oversized to allow for errors in measurement. The main issue here was that I wanted the row of mortises, which I will later cut into the hull planks, to be fairly level with the hull bottom and also low enough so that the plugs stay well below the top edge of the shaped plank.
With the hull planks rough-cut, I marked out locations for the nail mortises. I set these 7 sun apart, 1 sun from the plank seam. The mortises are trapezoidal, like the ones I cut for the shiki, or bottom, and 3 sun long.
When all the mortises were cut, plugged, and everything was dry and cleaned up, it was time to glue the hull planks into place. The first thing to do was to test fit them into place to make sure I didn’t screw anything up and that everything will fit correctly. This required that I remove the former from the base, though there were probably ways I could have come up with to hold the planks against the former while it was on the base. As it was, I ended up using spring clamps and rubber bands.
I had to pre-bend the planks to minimize the number of bands and clamps needed. This was a little iffy, since I used Titebond to glue the mortise plugs and to glue the planks together. Original Titebond is not waterproof and it’s not particularly water resistant, but I like to use it as it’s easy to clean up.
Also, before gluing the planks into place, I realized that the bow of my model was too wide and needed to be narrowed, so I sanded it down before proceeding. During the process, it popped loose from the model, but this only made it easier to shape. Afterwards, I glued it back into place.
It took a little while before I was confident that the alignment of the planks would be okay, but then I went ahead and glued up the planks.
Once the glue was dry, I could remove the former. I had a few issues where I didn’t have a good glue joint, so I had to re-glue some seams. At this stage, it’s a little delicate, so a little care has to taken with the model.
Next, I’ll be trimming away excess and adding details.
Something I didn’t mention last time was that I had cut a paper pattern for the shiki and rubber-cemented it to the assembled . I then cut the wood to the pattern. Since the plans I have show the lines to the inside of the planking, I left the pice a little long at the aft end, as the bottom extends slightly beyond the transom.
The final pieces are ready for assembly. As on the real boat, the hull planks will be shaped in place. Note that I also cut mortises for the bow plank, which I’m told is called the omote no tate ita. I’m going to have to find the kanji to make sure I know what this really means. The same goes for the transom, or tomo no tate ita, but in other regions is called the todate.
Pieces these parts together in their proper angles presented a challenge. Especially since the hull planks need to be shaped in place on the boat. The real boatbuilders built the boats upright, and used wedges, iron dogs (like big staples), clamps and posts to push and hold things into place.
As a model builder, the best solution was to build this model on a mold, though without gluing or drilling into the model, it would be a challenge to hold everything in place.
I started with a longitudinal pattern, which would give me the angles for the bow and stern planks, as well as the proper curve of the shiki. I marked the only two station lines on the drawings and cut the cross-wise formers to shape based on the patterns I drew earlier.
A scroll saw and bench sander made quick work of the MDF particle board formers, and the station formers were cut up and glued into place. In the meantime, since the bottom has a slight curve to it, I wet the wood a little and used a fixture I made for holding it into place as the wood dried. It was important not to get the wood too wet, just damp, to keep it from dissolving the wood glue, as I only used original Titebond, not one of the more water resistant versions.
In order to hold the transom piece into place, I had to come up with some kind of notched piece that I pinned into place on the centerline former. At the bow, a simple clamp held it into place. The pieces were glue together and held on the temporary former with rubber bands as the glue dried.
Once dried, the tricky part began, as I had to hold a piece of card stock into place well enough for me to trace a rough outline for the hull planks on it. Not being blessed with 4 hands, I decided to try making a fixture to hold the assembly into place.
The base fixture is a simple board with a clamp that’s designed to hold the former securely. It’s nothing more than two pieces of MDF with a small piece at one side that’s the thickness of the centerline former, all glued together and down to a baseboard.
The clamp and the former are drilled through so that I can run a clamping screw through them. I drew registration marks on the pieces to make alignment easier.
The bottom assembly could now be held somewhat securely, allowing me to work on it and transport it without damage.
The next step will be to make the hull planks.
Counting up all the major planks, transom, and beams, this Ayubune model will be made up of only 17 pieces:
In addition to these, I made patterns in paper for obtaining the proper angle for the lay of the hull planking. I have yet to decide at this point just how I’m going to fix the hull planks to that angle. But, there’s time before that needs to be deal with.
Yukio Nakayama recently posted some photos of a traditional boatbuilder’s workshop on his blog site. There are several photos worth checking out.
He also posted some images of what appears to be a lumber yard, where a small craftsman appears to be preparing to split a log to cut into planks.
I realized later that the boat outside is a bekabune. The boat inside, I think is an utasebune. In fact, that’s exactly what they are. If I had bothered to pay more attention, the label under the title of his blog page identifies them.
I sent this image to Douglas Brooks, who says that Nakayama-san had worked at the Urayasu Museum and think he had helped build the full-sized versions there.
These are posted on his blog, Edowasen, also on WordPress. Click the link below to view:
The ayubune is not my first Japanese boat scratch build attempt. The first was the Urayasu bekabune, a boat designed for working among the seaweed nets of Tokyo Bay. But, being unaccustomed to scratch building Japanese traditional boats, I was wresting with a few construction problems and a couple errors, so I set it aside. Then, I found the ayubune on Douglas Brooks’s blog.
The ayubune is a very simple design. There is no cutwater, the side are flush, making for a very simple shape, and there few details beyond the hull and beams. This seemed to be an ideal subject to start with.
Mr. Brooks recorded 3 sizes of ayubune in Japan, a 24-shaku, 18-shaku and a 15-shaku boat. I noted that he built at least 3 of the 15-shaku boats and posted photos and notes on their construction. At a traditional 1/10 scale, the 15-shaku boat would be just about 15″ long, which seemed like a good size.
Recently, there were several posts on Facebook regarding boats from the southwestern end of the island of Kyūshū. It took me some effort to review the posts and linked pages to figure out that the boats described were of the same general type, as the terms used to describe the type seemed to vary a bit. The boat is a Satsuma-gata, or Satsuma-type boat.
Satsuma is an old feudal domain that makes up part of what is now Kagoshima prefecture on the island of Kyūshū. I didn’t know much about this area or about this boat until the recent Facebook posts.
Yes! I managed to stumble across Mr. Yukio Nakayama’s wordpress blog site by pure chance today. I’ve know about this man and his work for about a year now. One of my Japanese ship model contacts even sent me some photos of the man’s work at an exhibition several months ago, but he never put me in contact with him.
I wasn’t too worried because my Japanese language skills are not good and I figured it would just be either frustrating or annoying for Mr. Nakayama if I tried to communicate with him, though I did find someone else who offered to put me in touch with him. Now that I’ve found his blog, I may just have to try.
In the meantime, you can visit his site and poke around and see some of his work on his blog. You’ll find a few drawings, plus photos of several of his models.
All his models are the same scale, 1/70 I believe.