Does anyone have any experience building a yuloh? Specifically, I am
looking for advice as to whether to use an 8 degree or 11 degree angle
on the blade. A reference to a good book on the subject would also be
appreciated.

Thanks
Tom

http://www.mindspring.com/~councill/...ng/scull3.html


"Tom Best" wrote in message
om...
Does anyone have any experience building a yuloh? Specifically, I am
looking for advice as to whether to use an 8 degree or 11 degree angle
on the blade. A reference to a good book on the subject would also be
appreciated.

Thanks
Tom

Tom Best wrote:

Does anyone have any experience building a yuloh?

Not witha yuloh, but plenty sculling (single oar over the transom) and
have read a good bit about them.

.. Specifically, I am
looking for advice as to whether to use an 8 degree or 11 degree angle
on the blade.

How heavy is the boat, what are the relative lever arms? A longer inboard
lever and/or lighter boat would favor the steeper angle.

Fair SKies- Doug King

It's a Sea Pearl 21. Only about 850 lbs loaded. As this is fairly
light, I think I'll try 11 degrees. The length of the lever are is
somewhat up in the air at the moment as I have two options on the
pivot. One is on the transom and the other is above the rudder in
place of motor mount.

Since you know of such things, should the side of the yuloh that faces
down be cut with an aerodynamic (sail) shape and the top side flat?

Thanks
Tom

How heavy is the boat, what are the relative lever arms? A longer inboard
lever and/or lighter boat would favor the steeper angle.

Fair SKies- Doug King

It's a Sea Pearl 21. Only about 850 lbs loaded. As this is fairly
light, I think I'll try 11 degrees. The length of the lever are is
somewhat up in the air at the moment as I have two options on the
pivot. One is on the transom and the other is above the rudder in
place of motor mount.

Since you know of such things, should the side of the yuloh that faces
down be cut with an aerodynamic (sail) shape and the top side flat?

Thanks
Tom

How heavy is the boat, what are the relative lever arms? A longer inboard
lever and/or lighter boat would favor the steeper angle.

Fair SKies- Doug King

Tom Best wrote:

It's a Sea Pearl 21.

Aha! My wife used to have one of these. Cool boat, we should have kept it.

Only about 850 lbs loaded. As this is fairly
light, I think I'll try 11 degrees. The length of the lever are is
somewhat up in the air at the moment as I have two options on the
pivot. One is on the transom and the other is above the rudder in
place of motor mount.

I'd go on the transom. There will be a lot of side thrust (in fact, it will
push harder sideways than forward) which will put more strain on the rudder
than the motor would.



Since you know of such things, should the side of the yuloh that faces
down be cut with an aerodynamic (sail) shape and the top side flat?

Since the leading edge alternates, you have to make it symmetrical or have a
yuloh that works better on one stroke than the other. But giving it a sort of
streamlided 'D' shape should help.

I rowed my wifes Sea Pearl many miles, why aren't you just plain rowing the
thing with good old fashioned oars?

Fresh Breezes- Doug King

D shape is what I was thinking. I'll give it a try. Probably right
on the transom. I was thinking the motor mount would be too wobbly.

I am reliably informed that a yuloh can be used for many hours with
little stress or strain. Whereas oars (fixed seat or sliding) take
the starch out of me pretty quick. Thinking of doing the Watertribe's
Everglades Challenge in the spring and need as many options as
possible to keep moving.

Thanks for the help.

Tom

Tom Best wrote:


I am reliably informed that a yuloh can be used for many hours with
little stress or strain.

If that's true, then I'd bet a lot it's because the boat is going slower
with a yuloh.

Whereas oars (fixed seat or sliding) take
the starch out of me pretty quick.

Rowing is a much more efficient way to transfer energy to the water from
your muscles. Think for a minute, if that weren't true, we'd have eight
man yuloh sculls.


Thinking of doing the Watertribe's
Everglades Challenge in the spring and need as many options as
possible to keep moving.

Thanks for the help.

You're welcome, let us all know the results. The newsgroup
rec.boats.boatbuilding might have a lot of other people interested in your
results, too.

Fresh Breezes- Doug King