Hello Everyone
After the bow deck planks had been installed, the end pieces for the Yuloh (rowing and steering oar) were added to both the bow and stern. The flexibility of the sampan is that it can be steered from both ends which makes it extremely maneuverable.
The red squares indicate the two platforms for the Yuloh (the steering and sculling oar). The construction of the Yuloh and its mode of operation will be discussed a little later.
PREPPING THE HULL
I could now turn my attention to sanding the hull. You will have noticed that I have not mentioned anything about that up to this point as I first wanted to make sure that the structural rigidity of the hull was good enough. With the deck planking completed and the floor in place though, the hull was as strong and rigid as anyone could wish for.
Now for interest’s sake – when I plank the hull, I do not bevel the edges of planks as they butt-up against adjoining partners. Lazy? I probably am, but that’s not the reason for not doing it.. Without beveling or chamfering, a little "lip" is created when two planks are butted-up against each other. That little “lip” that remains, provides (to me at least) the perfect angle (when viewed from the top) at which I need to sand the hull. I start by sanding cross-grain at an approximate angle of 45 degrees using "heavy artillery" 80-grit sandpaper. The Pear Wood is resilient and the 2mm thickness, meant that lots of sanding was required to remove the "lips". Once that was done, I moved down to 120-grit sandpaper and started sanding longitudinally and following the grain of the wood. Finally 360-grit was used to complete the process. The whole process was straightforward and there was nothing untoward.
YULOH
In his excellent book, "The Junks and Sampans of the Yangtze". G.R.G. Worcester wrote:
"Propulsion is by means of a single “yuloh”, or “lu”, an original and extremely efficient implement; 13 feet in length, it is scarfed in three pieces, thus forming a gentle curve. When in operation, the blade is kept very deep in the water, that is to say, 3 1/2 feet, or more than one-third of its length being below the surface, and as the face of the blade is 6 inches in width, this combination gives much increased leverage and power.
The yuloh pivots on a 3-inch bearing-pin* which ends in a knob. This pin is situated on the transom, and the loom is held in place by a coir lanyard, 5 1/2 feet long, attached to a ring-bolt in the stern deck. The hand holding the yuloh is held at head level and rather behind, while the hand on the lanyard works across the breast. It is interesting to record that the sculler can average 41 strokes to the minute under favourable weather conditions, yielding the satisfactory speed of 8
"li" (knots) per hour!
While most sampans share the exact same basic characteristics, they do, nevertheless, fall into two definite categories, known as “pang”, or groups. These are the Ning-pang, or group manned by Ningpo men, and the Soo-pang, or group manned by either Soochow men, men of Shanghai, or men from Kiangyin, a small town some 80 miles up the Yangtze.
The distinguishing feature is that in the Ningpo-owned craft the bearing-pin for the yuloh is situated on the port side, which necessitates the sculler using his left hand on the oar; while in the boats operated by Soochow, Shanghai, and Kiangyin men, the bearing-pin is on the starboard side and the sculler operates the yuloh with his right hand. The exponents of both methods maintain that theirs is the only reasonable mode of propulsion. My sampan is built according to the latter option.
*Bearing-pin: This might be confusing as it does not refer to a device which facilitates rotation, but actually means "load-bearing". In other words, it "Bears" or "carries" the Yuloh - hence me changing it the name to "load-carrying platform" and "load-carrying pin".
How the instruction manual shows assembly of the Yuloh.
The actual "load-carrying pin" and- "platform" as constructed on the model. Getting that platform to blend it seamlessly with the oar required patience. The slot provides the opening for sliding the platform over the pin.
The blade is constructed by pre-shaping two pieces of pear wood to the correct size and shape and then gluing them to either side of the oar. Interestingly, the blade and the load-carrying platform are at 90 degrees to reach other. So ... if the load-bearing platform is completely level on a horizontal plane, the blade has a 90-degree vertical angle.
The assembly on the model. In real model-life, that Yuloh is 35 cm long and the overall model length is 69 cm - so you can see that it is a substantial oar.
The picture below taken from one of Unicorn's test builds on the 4h forum clearly show the "operation" of the Yuloh and that this model was built according to the "Soochow" (Suzhou) / Shanghai style with the load-bearing platform on the starboard side of the oar and the right-hand higher up on the Yuloh - thus in the dominant position.
One of the smaller "Water-Taxi" sampans being "Yulohed" in Shanghai.
When I return for the next posting, it will be to show you the assembly and installation of the bamboo canopy.
Thank you all so much for looking, commenting, liking or just browsing.
Best regards - Heinrich