INVESTIGATOR 563

Wondering if anyone know/heard about rowing (or sculling - yuloh) an investigator or similar trailer sailer? For use as emergency backup propulsion or even short distance moving in harbors. Teria did come with a set of oars, but there's no sockets in the boat for them to go into as yet.

I think yulohs are a great idea Andrew. If you look on YouTube there are videos of quite large boats in Asia being moved by yulohs. As in our other active post, yulohs predate evinrudes by some years just as junk rigs if you add it up historically outnumber Bermudan rigs. I used to have quite a few links to yuloh construction somewhere, must be on my old Macs. I’ll check.

The trick is apparently, the rope connected to the cockpit sole that jerks the yuloh across to the opposite loft at the end of the stroke . I think that experienced users just use the wrist action.

I have lots of old timber oars stacked in the garden shed roof that I’ve been going to use to attempt to contruct a yuloh or some hybrid form there of for years. ( this is my cover story for my wife who wants them used as firewood) . Actually my plan was to make a bracket that is available commercially that converts a standard oar to a faux yuloh. It looks like a two 2” pipe clamp with a short connector piece. You clamp a standard oar hanging/ curving downwards into the bottom clamp and an, say a broken oar handle ( three in stock ) in the top clamp and stick it into a standard rollock mounted on the rear of your boat .

The dog leg in the rig means that you just move the faux yuloh back and forth and let the handle rotate through your hands rather that have to use your wrists to provide the changing angle of the blade. Hope that makes sense.

I will see if I can find my old links to this stuff .

There is a site called the sound of one oar rowing about yulohs.

https://www.pinterest.com.au/wrv77/the- ... ar-rowing/

Pinterest site which you need an app to fully explore but lots of pics on the splash page.

You could be the first off the block and start a trend here mate and we’ll all turf our outboards

http://www.simplicityboats.com/ScullYulohaboat.htm

Found this link which was the first one I read years ago . It’s a real bare bones hardcore yuloh use without even a notch . Gives good basic info though.

Also...

https://m.youtube.com/watch?v=dtv-5t8F29U

This is another alternative commercial alternative for propulsion for small boats.

Found that old link. Not quite how I remembered the bracket but I think I’d mentally transformed it into the junk I had on hand. I’m sure the average 563 owner could knock one of these up from the spares box before bedtime.
https://www.duckworksbbs.com/product-p/dw-sc.htm

Prize didn’t go off on my last competition so it jackpots. First person to successfully yuloh a 563 across a major waterway wins my old password from tsp AND my old password from tscom.org Although thats not much good really as even the members don’t go ther anymore

Thanks for the feed back on Yuloh's, it looks like a mysterious art.

that clamp system to extend an existing oar looks promising, to have the operators handle at the correct down-angle to get the blade to flip with minimal effort, probably after Teria's trailer rebuild is done and dusted (built the draw bar, final welds on the frame in progress - its very part time)

I have already tried single oar sculling on my 8 foot clinker rowing/sailing dinghy which has transom notch for this purpose.. I used the straight rowing oar which is not optimal and needs more effort to twist it , have tried the vertical blade approach (not the "falling leaf" one yet). always use the scull oar to leave/ return to the beach as the rudder is a fixed blade one (no kickup) My Fatty Knees 8 might be a good test boat for the concept before attempting scaling up to TS size.

Here's a video i found
(without the front lanyard)

https://www.youtube.com/watch?v=P3pbYMOK8Us

Not sure about that prize on offer tho!

Has anyone ever wondered how long rowing oars need to be (on any sized boat). ?

Just found this oar length calculator.

https://www.clcboats.com/ext/screen-f781f4b64b.html

Measured up my Investigator's potential rowing position (in old school units, sorry) It's 69" wide (coaming to coaming) and about 26" high (waterline to rowlock)

Plugged these into this calculator....in theory I563's would need 2 oars of 11'6'' length each!!
My oars that came with boat are 6'6", just small dinghy sized (probably useless on I563, could barely paddle with them)

Then found this deep dive page into the subject (warning, complex!).

https://hvartial.kapsi.fi/oarlength/oarlen.htm

He has a simple rule. Oar lengths are 2x the width of rowing position. 69"x2 = 138" = 11'6"

He has complex stuff, resulting in a graph which takes into account the "gearing". i563's need to be "low geared". It again comes out at around 11'6"

How to fit those monster's aboard? would have to be 2 parts. Maybe that's why 2 part yullohs are so popular for 18 foot or longer boats..(or ditch oars altogether, and just rely on outboard and/or a VHF, anchor and towboat )

Interesting links Andrew. There is a boat mentioned on Wooden Boat Forum and Duckworks often called a Row Cruiser. Essentially a 16 ft Woden canoe with a coffin berth in a low profile forward cabin. As an old kayak paddler this is really intriguing. It has outrigger rowlocks and very long oars, plus a sliding seat. By all reports it is a great little passage maker, if not ideal to get cooped up in during inclement weather. Pic attached fyi.

https://duckworks.com/rowcruiser-angus- ... wboat-kit/

If you google it, there quite a bit on it. Anyway rowing is an option for cabin boats. He who rows with biggest oar wins Andrew, I got tired just reading that second link on oar gearing. They need to factor in age

That's a very specialized and efficient rowing boat, the owner must be ultra-fit too.

All this prompted me into compiling a new blog post on "waterways" about Yuloh's and sculling oars on boats, especially for trailer sailer's, 8 ft dinghy's and perhaps even a bigger yacht. It has links to various yuloh's in use and to the Cheasapeak light craft oar length calculator.

http://teria563.blogspot.com/search/label/Yuloh

(and sorry about the deep dive link! will edit and make a warning sign)