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MOCK UP RUDDER CONTROLL

Here is a mock up of the idea of the rudder control.

Ex Lex has twin rudders. The reason is mainly for ease of making the boat stear itself downwind but also for using as a drouge when having them in V-position each one angled 20 degrees out.

I hope to be able to stear from any position. a stearing line will run the inside perimeter of the boat. In addition there will be control lines fron the two hatches to V-position the rudders for breaking (car owners think Ackerman).

To achive this the tillers have connecting bar, but are not directly conneected to the bar but to trawellers sitting on the bar.

Normal stearing is done with the trawellers in zero angle position. When I like to brake the trawellers are adjusted towards the center and thuse the rudders are angled out. The lines controlling the trawellers are run to the rudder accis that they may not be affected by stearing.

This is a first try so I can only hope that it will work.

Some hardware is on its way.

Above: The tillers parrallell for normal stearing.

Above: The tillers in breaking V-position.

Above: The mock up tiller head on the mock up traweller.

Abowe: The mock up stering lines moving the connecting bar.

Of course for those with a well lined wallet it can all be done more complicated using electronically controlled electricity.

To be continued…

Regards Yrvind

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FINS AND HATCHES

Lenghtening the boat has giving me more storage space. The new hatches can only be reached from the outside. I will only transfere goods in fine weather but it is important that they are waterproof.

The picture below shows how they are tested upside down before being installed. Ping pong balls are floating in the water.

Click once or twice to enlarge

Also I have now shaped the 4 fins, 2 rudders and 2 leeboards. They are the same shape and size as to replace each other in the unlikely case of breaking. The tipp part is laminated of five 10 mm plywood laysers.

To be continued…

Regards Yrvind

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RELIEF

I have two visitors. Falcon a yachtsman. He spent his first week in a hospital. Then he spent a week in a flat, then one month old he crossed his first ocean. He continued to live 18 years in the boat sailing the eternal endless sea. Now he is here to give me a hand.
Miki is also here. He is from Austria. He helping to modelling my boat in Rhino, like he did with Yrvind Ten.
I took the opportunity to ask my visitors to give me a hand in weighing Ex Lex.
We put everything ready into her, masts, spars, leboards, rudders, hatches ecetera. It came out to 415 kilo. Everything is strongly made and it has been a while scince I weighted her, so it was a releif.
Miki did a calculation in Rhino of the displacement and found that she will float nicely at 32 cm draft loaded to 1100 kilos.
That will take care of the weight problem I think.
Below some pictures, Falcon in the photo

To weigh the boat I hang here in two ropes and add the forces. The picture below show the wheight of the back rope.

This little calculation shows the wheight estimate.

Boat at present 415 kilo

Betteries 75 kilos

150 more kilos to finsh boat

Food 250 kilo

Water 100 kilo

Miscellaneous 100 kilo

Total 1100 kilo

I reserve the right to make miscalculations.

To be continued…

Regards Yrvind

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EXTENSION LAMINATED PART 2

Today I removed the pealplay and turned the boat over to evaluate the new set of possibilities and do some work on the inside. Meauring the boat she turned out be 5.76 meters, 18 feet and 11 inches, pretty close to 19 feet a bit longer than expected. I am pleased.

Foto 1 me with the ripped of peelply.

Photo 2, Me at the end of Ex Lex.

The extension will contain a box for more food, swim fins, snorkel and diving mask and such things. Behind the box a swim plat form that includes ground gear. Mock ups will determine it.

Also there will be a boarding ladder which foulded up and extended behind the boat will support the yuloh. Raised even more it will be an safe and comfortable place to excrete from.

Ex Lex will have twin rudders.

To be continued…

Regards Yrvind.

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EXTENSION LAMINATED

Today Petter helped me to laminate the extension.

It went well.

Below are 3 photos.

Petter and me.

One more from an other angle.

Me and Ex Lex.

The boat is getting closer and closer to my “Boat Ideal” which is today 7.8 meter long by 1.3 meter beam. Ex Lex is 5.65 long by 1 meter beam.

Yacht design is an iterant process “Boat Ideal” will have the same square section. I wonder if she will go to windward without leebord or other lewaypreventing devices.

Might not the flat sides function a bit like a chinerunner now that she has a lenght/beam ration of six?

When healed over say 20 degrees she presents a lot of flat surface to lee, several square meters, many times more than other boats keels or centerboards. After all a hulls weatherliness is the ratio of her resistance to lee compared to her resistance forward. A long slender hull with flat sides has much to speak for her although a fin keel is more efficient per unit of surface the slender hull more surfaces and uses them in other ways to, like to get a very low displacement lenght ratio, say below 150 and for a given displacement a longe waterline lenght.

She will most probably not be as weatherly as a finkeelboat, but well satisfay my desires as well as give a uncomplicated shallow draft cruiser.

Also for my use, in the narrow boat I can make a much better layout.

Klick once or twice to enlarge.

I think Ex Lex will give me a good indication of how “Boat Ideal” will work.

To be continued…

Regards Yrvind.