Yuloh, yuloh, it's off to work we go,,,,,,?

[Ian G Wright]

Best way to make a bent oar, Steam, Laminate, Other?,,,,
I have a (straight) sweep that I'd like to use but I suppose a new built one could be done,,,,,,,, Ideas please?

IanW.

[NormMessinger]

I'd laminate up a new one. On the other hand if you can steam the one you have and get it to take a bend you'll be work ahead. If you break it then you can laminate a new one.

Was it you who suggested the hip prothesis would make a good pivot point for a youloh? You know what them suckers cost new? Dang near $11,276.64!US. I don't think I can get my heath insurance to pay for another one even used.

--Norm

[Meerkat]

Yulohs I've seen appear to be scarphed out of two pieces of wood.

Norm, maybe he could get one at a mortuary ;)

[J. Dillon]

I laminated my 16' yuloh. By the way WB did an article on this subject (sculling) years ago. In my research on the yuloh which included a trip to China the curve is on the bottom not the top as shown in the article. Each builder in China coveted the amount of curve he built into his two piece lashed together yuloh. For my light displacement low initial stability V bottom sailboat the yuloh was ineffective. It was a case of "the tail wagging the dog" For heavy dispalcement boats it is probably more effecient than sweeps. For a dink.. oars would be better IMHO

JD

[Ian G Wright]

Originally posted by NormMessinger:

Was it you who suggested the hip prothesis would make a good pivot point for a youloh? You know what them suckers cost new? Dang near $11,276.64!US
--NormYup that was me,,,,,Well they do replace them once worn, what do they do with the things? Re-use 'em on poor people?

IanW.

[NormMessinger]

I doubt it but I'm gonna ask.

--Norm

[True Love]

Get your veterinarian to order the hardware for you. We use them in hip displacements in dogs.

[True Love]

make that "hip replacement" for dysplasia. my brain's on vacation today.

[Frank Wentzel]

Ian

How about some discussion of how that would be done. I have a few hip joints that came into our recycling center from a mortuary/creamatorium cleanup (I know, it sounds disgusting!) If anyone else wants one I'll see if I can dig them up (sick! sick!).

/// Frank ///

[Ian G Wright]

Originally posted by Frank Wentzel:
Ian

How about some discussion of how that would be done
/// Frank ///Er,,,,,,,,,well as far as I know,,,,,, using the ball of the hip replacement on/in the transom and a suitable cup on the sweep a simple push/pull on the loom is converted, by the geometry of the joint into a tilt of the blade.
or,,,,,,,, damn I wish I knew how to post a drawing. smile.gif As the loom of the sweep is move (say) to starboard, it, the sweep, 'falls' to starboard thus twisting the blade into a pitch angle. The more the fall, the smaller the pitch. Push the loom the other way and the pitch reverses as the stroke does.
So no deliberate rotating of the sweep occurs, the geometry of the joint takes care of that.
Any of that make sense?

IanW.

[NormMessinger]

I guess we've hijacked you thread Ian. Thanks.

Frank when you say anyone else do you mean besides your self or besides me. Put me on your list, if you please.

I'll see my hacker a week from tomorrow and will atleast get a picture of the joint. Shoot, if I have to I'll make one. (more or less)

--Norm

[Ian G Wright]

Originally posted by Frank Wentzel:
If anyone else wants one I'll see if I can dig them up (sick! sick!).

/// Frank ///If it's legal to export used body parts from the US I'll take one, it'll do for a foundry pattern,,,,,,, No,,,,,, I wouldn't use one that had out lived it's owner, not on my boat,one has one's standards, don't you know.
smile.gif
IanW.

[J. Dillon]

Are you guys are over engineering the simple part? ;) The Chinese have a socket sitting a rounded peg. smile.gif Now the shape of the blade ... THAT'S! sophisticated . ;)

JD

[NormMessinger]

Not at all JD. A socket sitting in a round peg is just what we're talking about. $11,000+ new.

--Norm

[J. Dillon]

Norm, How about making it out of wood, black Locust, say about a buck ? ;)

JD

[NormMessinger]

Plan B is to take the digital camera and some graph paper to my next appointment. I'll get a photo which I can scale from. Also in the "wouldn't it be a blast if" planning stage is a charcoal foundary and bronze casting. See where I'm going here? http://www.backyardmetalcasting.com/ Well, I have more boats than I can use now and I gotta pass the time somehow.

--Norm

[JimConlin]

www.jcwhitney.com (http://www.jcwhitney.com) has stainless trailer balls.
A bit oversized, but somewhat less expensive, starting at $27.99

[dadadata]

A trailer ball and a socket made of "trex" or UHMW ought to work fine. Fer crying out loud, hip joints... there are U-joint boom fittings for a lot less than $11K but you won't be able to unship yer yuloh.

Our is two or three pieces. The drawings and the (one) I've seen in person have angled flats cut on the places where the pieces join. Joints seem to be wired together with iron wire, or lashed in some way. Pins or pegs/treenails would seem to be workable.

Epoxy of course is the sensible way...

See some yuloh material at:

http://freepages.genealogy.rootsweb.com/~fassitt/cranks/cranky_sampans.html

and be sure to see the closeups in the "Photos from Museum" link.

[dadadata]

Here's a description of use ca 1900.

===
These houseboats are large, roomy affairs, their clumsiness being amply compensated for by their comfort, and they are eminently suitable for the creek and river work for which they are constructed. They are propelled by sail and "yuloh."

To request me to describe a yuloh, however, is-like asking for a description of many other Chinese survivals that have never been introduced into Europe-setting me a task difficult to perform.

The method of using a yuloh is similar to that employed by fishermen to propel a small boat with one oar over the stern, known as sculling or "wangling"; but when one sees the oar one realizes that the Chinese mind is capable of the most recondite reasoning.

The yuloh is a long oar with about three feet of the handle bent down from the plane of the blade, which latter is feathered down from the centre ridge with one flange larger than the other. At the point of fulcrum is a little hollow or socket, made to receive a pin witb a broad head like the round end of a bolt, and to the inboard end or handle of the yuloh is attached a line about four feet six inches long, which is fastened down to the decic.

The boatman rests the yuloh on the pin, grasps the line with one hand and the yuloh with the other, gives a peculiar swing to his body in order to concentrate practically all his force on the rope, which is now strained taut, and-Presto! you are wriggling through the water at a surprising rate by means of a perfect system of applied mechanics that was in use probably many centuries before Noah went into the salvage business.
===

[dadadata]

I knew I had some links somewhere for more or less technical or building info.

Modern style - Mark Zeiger:

http://www.alaska.net/~mzeiger/MJprogress04.html

The Japanese "ro", a cognate technology. Unfortunately the diagrms re small and labels are in Japanese in some places, but there's a dimensioned drawing. If you like centimeters.

I believe I also sw this material in one of the UN FAO reports on Fishing Boats of the World.

And also the "ro", in models and pix from history; interesting but slow to load:

http://www2.cc22.ne.jp/~ozwrow/ozr/waterdev/ro2/rogalle.html

http://www2.cc22.ne.jp/~ozwrow/ozr/waterdev/ro/roe.html

[Joe Dupere]

I recently ran across the article in WoodenBoat number 100 (June 91, Pg. 60) about sculling. I tried it at the end of last month. My technique needs a lot of work!! But mostly, I think I need a longer oar as the one I was using was maybe only five feet long. I'm going to be building another set of oars this winter about 7 or eight feet and then see how that works next summer.

The WB article referenced an earlier article from Messing about in Small Boats. Does anybody know how I could get ahold of that article?

Joe

[NormMessinger]

"Fer crying out loud, hip joints..."

Ah, but something different is just ezakly the point. Any old coot can install a trailer ball or what ever. There is something elegant about a real prothesis. Saddly, as unlikely it is that we can get one for a reasonable price. AH! I'm gonna change my living will. At least Lynn or Wes can install it when I'm finished with the one that's paid for.

--Norm

P.S. your links are most helpful. Thanks.

[J. Dillon]

Norm,

Now that you have a fleet, how about starting to make models of them ? ;) Ya could sail em in the bath tub during the winter. :cool:

Dadadata,

Thanks for posting the info on this facinating device. Do you have any drawings or data on the shape of the blade ? I found the curve is on the bottom and it makes a big difference on the performance of the Yuloh.

JD