Present Project

ALWAYS SNUG AND WARM

2010-04-09T11:41:00.000-07:00

click on the pictures to make them bigger
Above. The frame for the hatch to the bedroom is getting in place.

Below. With the hatch on I will always be snug and warm in my bed. The theory is as long as I am comfortable and nothing breaks I can survive anything.

POINTS OF ATACHMENT FOR THE GRABRAIL

2010-04-09T11:19:00.000-07:00

Above. I start with temporary attaching the grab rail with several wooden pieces screwed into the laminate and a piece of string. When the grab rail is in the desired position I remove half of the temporary pieces and replace them with high density (425 kg per cubic meter divinycell pieces shown to the right of the wood piece)

Below. I the lash with carbon filament unidirectional glass to get it into position. The ends are cowered with 45 degree glass cloth. The I use NM-Epoxy as glue covering it with peal ply to get a nice finish. Then I replace the temporarily wooden pieces with Divinycell and repeat the process wich is time consuming but gives very satisfactory result.

MY BIRTH DAY 22 APRIL 2010

2010-04-07T11:39:00.000-07:00

TACK VARE VARATS OUTGRUNDLIGA REGELMÄSSIGHET FYLLER YRVIND ÅR I ÅR PÅ SAMMA DATUM SOM FÖRRA ÅRET, DEN 22 APRIL.

LIKT FÖRRA ÅRET TAR JAG DET SOM FÖREVÄNDNING ATT FÖR PERSONER MED POSITIVT INTRESSE FÖR LÅNGFÄRDSEGLING I SMÅ BÅTAR VISA HUR MITT VERK UNDER DET FÖRFLUTNA ÅRET HAR FORTSKRIDET.

PRESENTER VILL JAG INTE HA, FÖRUTOM EN PIL OCH PILBÅGE AV SAM ATT JAG FISK MED. HAN HAR ARBETAT PÅ DEN TILL OCH FRÅN, MEST FRÅN, UNDER RASTERNA DET SENASTE ÅRET.

DET BJUDS INTE HELLER PÅ SAFT OCH BULLAR ELLER NÅGOT ANNAT JÄTTEGOTT.

PLATS BAUMANSGATAN 4 59353 VÄSTERVIK. TID 16 - 18.

ELECTICITY

2010-03-10T10:44:00.000-08:00

The picture shows the first parts of the electrical system. One charger CHAMP III 12v/7A from PRIMEPOWER It is very compact and waterproof, ideal for a little boat.

There is also six 17 amp hours Exide Sonnenschein gel batteries. Gel batteries have a better cycle life, they can be cycled deeper and more times than Agm batteries. Agm batteries can are better for starting engines but on board there is no engine.

More about gel batteries

THE FORWARD PUMP

2010-03-05T11:04:00.001-08:00

Forward of the forward bulkhead I have now installed a pump, manual of course. I do not expect a leak there, but when for example I am beating into the south east trades at the equator it can for a Swede be uncomfortable hot with hatches closed. Now I can keep the forward hatch open and now and then at ease pump out any spray water.

At the bottom of the fore hatch is a 16 mm stainless pipe in form of a triangle. To it I can tie down anchors and other stuff to keep them in their place. This is important.

To prevent water enter the back way I use a valve. Most marine hardware comes in King Size therefore I remade the handle to a smaller one. Also before the valve only closed one way, the wrong way to the left, now I can close it to the right.

Below the original handle and the new one.

SOME DETAILS

2010-02-28T12:08:00.000-08:00

The above picture looks afoul, but the results are nice. Its a styrofoam mold covered with packing tape. Then I glassfibre it and get when done I get a nice detail.

Here is a mock up for the fore hatch to see how big an anchor I can stove.

The screw holds down the back window which can be opened in nice warm weather. The nut is bronze which will be glassed in with epoxy.

More later.

YRVINDS YULOH

2010-01-12T11:33:00.001-08:00

The picture below shows the essential yuloh geometry. There are three points of importance. The centre of effort or pressure on the oarblade. The fulcrum and the point were the rope is attached. If you draw a straight line betwwen the centre of effort and the point were the rope is attached the fulcrum shall be a inch or two above that line to keep the thing in balance. Exactly how much is depends on personal preference.

The curvature of the traditional yuloh fixes these three points. On my boat it is not possible to have a curved yuloh as I will store part of my yuloh belov the fore deck in a carbon fibre tube. My yuloh is therefore straight.

To get the essential geometry I have added a removable piece at right angle to the shaft. At the end of that is the attachment point. By varying the length I can adjust the balance. That solves the problem of stowing the oar. It is also very convenient because I can use a straight pipe as oar shaft.

An other thing. Some people like to have the rope doing the twisting of the oar blade at each stroke. I do not agree, neither do the Japanese scullers. They have a technique that differs from the. They have a small handle at right angle to the oar shaft a bit like wrench to twist the blade to the desired angle. In that way you have control and can use the oar blade as an variable pitch propeller. Going against strong winds you use little twist and get much power but the boat mows slow. In calm weather you use much twist and the boat goes faster.

The yuloh traditionally uses a ball and socket at the fulcrum. It is simple to make but a universal joint like mine shown below has several advantages. As a yuloh replaces an engine and I use it a lot I do think it is worth to spend time and money on a better fitting. First the oar cannot jump out of the socket. Second it enables one to scull in reverse and row the stern around. This is very convenient when one maneuvers in tight places. And I do like to get into tricky places to discover interesting things.

SPARS - A PLACE FOR EVERYTHING AND EVERYTHING ON ITS PLACE

2009-12-19T11:00:00.000-08:00

CLICK ON THE PICTURES TO MAKE THEM BIGGER
To make the rig adaptable to every wind condition she carries plenty of spars: one topp mast, two light wind booms, two hard wind booms one sprit and one big yuloh to be used when there is no wind. If I had them on deck there would be no place for things like solar panels. I carry them below deck in carbon tubes. The picture below shows the holes where the spars will enter.
This arrangement has the advantages of lowering the center of gravity and reducinging wind resistance. The spars and the mast are easily accessible from the main hatch. I dont have to go on deck to adapt the rig.

The picture below shows the spars in the main cabin, the bed room. The two vertical struts support the deck beam.

The forward ends of the tubes drain overboard. Here I am building up a support of aluminum netting for the glass fiber which will connec the tubes to the drains.

A CHEAP LIGHT HINGE FOR ANGULAR AND LINJEAR MOVENENTS

2009-12-16T10:34:00.000-08:00

The hinge is for the aft opening window in the deckhouse. Below is a picture of how I made a mock up of the window.

Below the window mock up is in place in the open position.

Below the window mock up is in place in its closed position.

Below is a close up of the hinge which makes possible angular and linear movements. It is important to have a linear movement in a window when you clamp it down. Ordinary hinges, in my opinion is no good. Still they are used by nearly every one. The reason why the are not always leak proof is you can only clamp down one side of the window, the side opposite to the hinge.
The thousand old trick of making a hinge of a rope threaded in a eight figure gives enough play to move the windows edge deep into the gasket. Making it non leaking in all conditions.

A VISITOR

2009-12-10T11:48:00.000-08:00

On Saturday 5 Dec 2009 Mattias visited me. He is a professional balance adjuster. Here he is adjusting my balance I use for epoxy. My balance is now accurate to a tenth of a gram. I feel that if I can do my best on land, my chances to succeed at see will be bigger. I also always pour the epoxy in a second container after having mixed it.
Mattias has is interested in small boats and have bought plans for an Paradox a Matt Layden design.
Paradoxes are slowly spreading from Patagonia to northern Norway.

THREE STEPS BACK AND A NEW THEORY FOREWARD

2009-12-01T11:11:00.000-08:00

The bowboard daggertype did not slide up and down to my satisfaction.

I made a new board rotating around an axis. However the line arrangement became to complicated to my taste. I wanted to be able to chance the lines at sea.

Next idea to keep the bow into the wind, making her nicely fore-reach in a storm was to have a mizzen on the rudderpost and sheated to the rudder like the Thames barges a hundred years ago.

However being modern I wanted to make a solid rotating wing-sail using a VX40 rudder. Even that turned out to have its problems, but if at first you do not succeed, try again.

The final theory is to lean the mast to lee. That will give the boat weather helm, creating the same effect as a bowboard or a mizzen but much simpler.
The above picture shows a mock up of the strut giving the mast additional support in storms. The tilting angle is 30 degrees. In addition I have the shrouds.

At the moment I am repairing the damage I have done to the boat. Taking away the case for the bowboard and filling up the big hole.

COPPER POWDER

2009-11-16T10:33:00.000-08:00

Thanks to the ingenuity of Beppe my web master my blogg now seems to work. Apparently there are a thing called html which somehow showed itself instead of the picture.

The above is the sides of my centerboard case the inside surfaces difficult to reach on the finished boat i have therefore sprinkled them with copper powder to make them antifouling. As copperpowder solves not well i epoxy i have put peelply on top. After tearing it away one gets a nice smooth surface. It is also good for the underwater part of the hull.
Greatings from Yrvind back in business.

SMALL WINCH OR LINE TENSIONER

2009-11-13T11:00:00.001-08:00

This is line tensioner is for the jib. I have redesigned the rig. There is no longer a forespar nor a stay for the jib to be hankt on to instead its leading edge is made of spectra or dynema and tensioned. Hence the winch.
It gives a very big force fore its size and weight and need no servicing
An other great advantage is because the standing part is made of carbon it can be laminated to the deck spreading out the load on the sandwich construction

Unfortunately the software to this blog still does not work. This has been written blindly. When it works properly I will write more.

DECKHOUSE

2009-09-29T09:03:00.001-07:00

A WORLD SPEED RECORD

2009-09-13T12:43:00.000-07:00

Bamboo can grow 121cm 47,6 inches in a 24 hour period with one hour burst of speed more than one meter. That is a world record and impressively fast. But my my boat will be much faster. She may average 3 knots or 133344 meter in 24 hour. But that is slow compared to a airplane which crosses oceans i a few hours. However the sense of speed of bamboo growth or my boats speed is big and that is one of the reasons why it is not boring to spend months at sea in her.

FREQEUNTLY ASKED QUESTIONS

2009-09-06T11:18:00.000-07:00

FREQUENTLY ASKED QUESTIONS

WHY A SMALL BOAT

Body and mind is one.
A small boat gives a healthy body.
A healthy body gives a healthy mind.
A big boat gives comfort, but comfort makes you fat and bored.

WHEN WILL IT BE READY? THIS IS THE MOST FREQUENTLY ASKED QUESTION.

Good work is the determining variable not time. I like doing good work. I dislike haste. Therefore when not proud of what I have done I redo it until I am satisfied. Dogged does it, and one day the boat will be ready, but when I do not know and to me it is not important because I do enjoy building her.

MAST SUPPORT

2009-09-02T11:03:00.001-07:00

The above picture shows the mast support. One beam and two pillars.

Publishing problems

2009-08-25T13:11:00.000-07:00

By Beppe Backlund Webmaster

Yrvind.com is powered by the well known blog hosting service Blogger, owned by Google. Each part of the site are one separate blog. When Sven is publishing posts, he log into Blogger and make his writing with the tools provided by Blogger. Blogger then transfer the results (via FTP) to yrvind.com located at an webhosting service in Sweden. From day one of this websites life and until the beginning of august ( over a year) this arrangement worked just fine. Now everything is a mess. Sven is unable to properly upload images and publish posts. This situation is frustrating since Sven have a lot of work done on his boat and he want to be able to inform all of you out there.

It's also frustrating for me as a webmaster. Because i can't do anything about it. Just sit and wait and hope the people at Google fix the problem. One good thing is - we are not alone. There are many people round the world experience the same problems. Please feel free and click this link leading to The Blogger Help Forum http://www.google.com/support/forum/p/blogger/thread?tid=3ec5d1e5f9f66b5d&hl=en Make your voice heard and write some lines and tell them you have been waiting so long to read more about Sven and his interesting boat project.

UNDER AFT DECK

2009-08-23T10:54:00.000-07:00

If at once it does not work try again. The blogger gives trouble, when I am inserting pictures. However by repeating the insert many times finally they are accepted, so here are some pictures of resent work in the aft part of the boat.

Below is the seat and half a waterproof bulkhead which serves as backrest. Behind it and and below the aft deck is the chart stowage.

The chart drawer.

Below it on each side is my water stowage. It is a close fit, but it works thanks to the elasticity of the polyethylene canisters.

Here they are in place. At sea they are tied down with ropes.

A NEW WEBHOSTEL

2009-08-15T11:02:00.000-07:00

Economical circumstances has advised me to to change web-hostel. This has taken some time and given me much problems. One is that at the moment no pictures can be published. However my webmaster are working on the problem.
Luckily this does not prevent me from working on the boat. Much progress has been done and new idea's developed. More later. Yrvind

ON THE IMPORTANCE OF BOWBOARDS

2009-06-14T10:50:00.000-07:00

The above and below pictures shows the first steps in installing the bowboard.

Matts chinerunners and my big rudder will supply leeway prevention under normal conditions. But as I am trying to do a 50 south to 50 south westward Cape Horn rounding I will surely encounter conditions not always normal. To cope with the expected westerly hurricane force winds I am equipping YRVIND.COM with a big bowboard. Average keel area to sail area in modern fin keel production boats are 3.5 % with a spread of 0,75 %. Accordingly not many boats have more than 4.25 % keel area compared to their sail area. The area of my bowboard exceeds that many times. With a span of 0.78 meter and a chord of 0.40 meter her area is 0.312 square meter. YRVINDS working sail area is about 3 square meter in a fresh breeze. This gives her bowboard an area of more than 10 % compared to her sail area. That is roughly three times as much as on a production boat, not counting contributions from her lifting body hull, big rudder and chinerunners. Most likely no other boat has ever had so much lateral area compared to its sail area or wind resistance. The main reason for the bowboard is that it will act as a pivot point in heavy weather. It will let the boat weathercock as it is forward of the sail area and resistance. That is a much better way to avoid being driven back by storms than using see anchors. 1989 sailing from France to Newfoundland in my 15 foot Bris I encountered a series of gales lasting eleven days. When the clouds parted and I could get a few altitudes of the sun with my sextant I found to my joy that I had gained westing. Bris had a bowboard. It was it that weathercocked the boat so that she was not driven back. Yrvind have a bigger bowboard and less wind resistance thanks to her lower and narrower hull and her wing mast. With the bowboard down one can lay very close to the wind with a very small sail area. The boat is slowly and compared to other methods comfortable forereaching. Because she is so close to the wind she is taking the waves nearly head on and not much water is coming on her deck. Also unlike with a sea anchor one is able to maneuver, to get out of the way of a ship not under command.

BRIS-SEXTANT FOR SALE

2009-06-08T13:02:00.001-07:00

BELOW ME WITH MY SEXTANT

ILLUSTRATION MARTIN MÖRCK

THE DIMENSIONS OF MY SEXTANT

THE DOUBLE AND QUADRUPLE REFLECTIONS IN MY SEXTANT

WHEN THE SEXTANT IS ATTACHED TO MY GLASSES I GET AN ABSOLUTELY STEADY VIEW AND BOTH HANDS FREE AS THE BRIS-SEXTANT NEEDS NO ADJUSTMENTS

PHOTO JONAS EKBLAD
VIEW FROM THE SIDE

PHOTO JONAS EKBLAD
BRIS-SEXTANTS FOR SALE

1997 I produced a small altitude measurement instrument as a back up to my sextant. I soon realised that other sailors also could use it and that it can serve as a pedagogical toy for those interested in astro-navigation and that it makes a nice birthday gift. When the international yachting press published articles about my invention Cassen and Plath in Germany and Celestair in the USA started to sell them for me, but commercial production was boring so I only made a few before going back to mess around with my boats.

That is now many years ago. Today I need money to help finance my present project; therefore I will sell a limited number to private citizens. If you are one of those individuals who like to own, or give away, a unique BRIS-SEXTANT, please phone me, Swedish time 2000 to 2200 at +46 490 21530.

Here are some salient facts about my instrument.
It is smaller than most people’s thumbnails. Its weight is 3 grams or less than one eight of an ounce.

The common sextant consists of many parts, some moving; it is complicated and delicate and has a very accurate analogue scale. The BRIS-SEXTANT has no moving parts and no scale. It consists of carefully dimensioned spacers and a number of beam splitters, glued together to a unit with a specially formulated epoxy.

When a ray from the sun is double and quadruple-reflected between three beam splitters, three bright and five less bright images of the sun appears on the horizon as seen through the instrument.

I have built BRIS-SEXTANTS with higher number of beam splitters, they increase the numbers of the images in a combinatorial way. It is a fascinating exercise, but personally I prefer the three beam splitter sextant for its simplicity in looks and image pattern.

To find ones position at sea, in a small rocking boat, with the help of the sun, its altitude above the horizon has to be measured, from the top of a wave and during that limited time when the boat balances on the top of a wave. The measured error should, preferable, be not more than a minute of a degree. The BRIS-SEXTANT makes that possible by keeping the image of the sun steady on the horizon however much the boats rocks.

This amazing, inbuilt, freedom from change and variation is due to, that the images of the sun is always created by an even number of reflections. When the boat heals one way or the other, the first beam splitter reflects the image away from the horizon, but at the same instant, its mate, the second beam splitter which is glued to the first one moves the same distance in tandem, picks up the light beam and reflects it back to exactly the same position, free from change and variation. The impressive result is constancy. The principle is old and well proven. Radar reflectors and periscopes are other double reflecting devices that work equally well even though the angles of operation changes.

But there are more to angle measurements than constancy. It is not an easy art. Every angle consists of two lines and their intersection. The surveyor has to align his instrument first with one line then with the second. Early navigational instrument like the cross-staff also required the navigator to look in two different directions before the angle could be determined. This is of course time consuming and not suited for marine use as an altitude can only be measured during the limited time the boat is on the top of a wave. The sextant has changed all that. The instrument brings the sun down to the horizon so that the navigator can see the two endpoints of the angle he measures in one and the same placer.

The BRIS-SEXTANT has no scale, nor any mowing parts. It cannot be adjusted and there is no need to, because I chose simplicity over universality.
To explain how it works I will use a metaphor. A balance compares the unknown weight to a standard weight, a spring scale measures weight by the distance a spring deflects under its load. The ordinary sextant has a very precise scale engraved upon its arc. Its readout is analogical like the spring scale

The BRIS-SEXTANT has no scale; its readout is a bit like a balance, it compares the unknown quantity to a standard calibrated quantity.
In the case of the three beam splitter instrument each of the eight images of the sun are discrete standard calibrated quantities.
The business of the sun is to rise in the morning and set in the evening. When doing this she is pulling the images, created by the BRIS-SEXTANT, behind her like pearls on a string. All the observer has to do is to time them as they reach the horizon.

An evident but little realised fact is that two times a day you can determine the suns altitude without a sextant. Those two times are at the sunrise and at the sunset when the suns altitude is, of course, 0 degrees. With two timed observations of altitude you can calculate your position.

An observer using the ordinary sextant brings the sun down the sun to the horizon with the help of the index arm. Thereby he is creating an artificial sunrise or sunset. The instrument shows you how many degrees the sun has been lowered. Sextants are in fact sunset and sunrise repeaters.

Before you can measure the altitude with the BRIS-SEXTANT, all you have to do is to calibrate the instrument and it is no more difficult than taking an ordinary sight.

Three magnitudes are connected by equations. They are, time, position and the altitude of the sun. If two of them are known, the third can be calculated. To find the constants of the BRIS-SEXTANT, observe from a known position the horizon below the sun, through the BRIS-SEXTANT, keep it close to your eye, like when you look through a keyhole, never up at the sun. Take your time; watch as one of the images is getting closer and closer to the horizon. When the bottom limb or top limb or the centre of the sun is exactly on the horizon take the time. That done, use the time and your position to calculate the images constant, which is the suns altitude. Repeat the procedure for the other images. Make a table of the results. Later you can use the calibrated altitudes and time to calculate your position.
There are some relations between the constants. The difference between the suns upper and lower limb is obviously the suns diameter which is on the average 32 minutes of an arc.
If the three bright images are A, B and C and C is the biggest angle then A+B=C. The five less bright angles are 2A, 2B, 2C, A+C, B+C.

Because you have just determined the altitudes of the eight images by calibration and as the instrument has no moving parts there can be no errors, adjustable or nonadjustable. There are not even mirrors to resilver.

Sight corrections like index error, dip of horizon, refraction, semi diameter, parallax and so on are an important part of ordinary astro-navigation. Forget that when using a BRIS-SEXTANT. The reason is if you deduct them when correcting the sextant you have to add them when taking the sight. If you are very fussy you can note the time of year when you do the calibration because there is a small correction for the suns diameter and an even smaller for her parallax, but that’s for the advanced user.

An ordinary sextant takes up as much useful space as eight oranges or more, but if you don’t mind that and that it is a delicate instrument craving adjustments, it is a more universal instrument and unlike the BRIS-SEXTANT can be used to take a noon sight without a time piece to determine your latitude. The BRIS-SEXTANT is not meant to replace the ordinary sextant or GPS but to be used as a backup.
The BRIS-SEXTANT has no telescope, but in the hands of a good human eye, mine, I have measured altitudes time after time, from the steady platform of a beach, to an accuracy of one tenth of a minute of arc.

In a clean BRIS-SEXTANT you can see eight images of the sun. From each sun you can get tree readings, the lower limb on the horizon, the upper limb on the horizon and the centre on the horizon. Eight times three is twenty-four. You can make these same observations twice a day, in the morning when the sun rises and in the evening when the sun sets. In total with a BRIS-SEXTANT, in clear weather, you can make forty-eight observations each day. That is enough to make my small back-up instrument worth while.

As a bonus because the BRIS-SEXTANT is so small and light you can attach her to your glasses. There are two major advantages to this. First the image becomes dead steady. It is like watching a sunset without an instrument. It makes the observations very much easier. Second you got both your hands free so that you instantly can write down the time. The timing has to be done to the second, if accuracy is desired.

Don’t hesitate phone me and order your unique BRIS-SEXTANT. Swedish time 2000 to 2200 most days. Phone number +46 490 21530.

So far so good . . .

2009-05-13T00:19:00.000-07:00

By Beppe Backlund, Webmaster

Sven has celebrated his 70 year birthday, 22 of April. His ordinary plan was to be ready with his boat at this very special day. Now he realized that the party have to wait and the start of his long and hazardous journey to Cap Horn will be at a later time. Building a boat, even a small one, will take time and as with a lot of other big projects - they will be delayed. We – his friends – are in fact not so disappointed about that, as we now have the opportunity to enjoy his very special person even the coming year.

The 70 year birthday event was held in his own workshop. 40 or more people where visiting him under the two hours he let the door open. Almost every one had his own question to ask. Sven answered them polite in his special manner. He also jumped into the boat in purpose to show how he take place inside. As you can see on some of the pictures below – there isn´t much headroom.

The boat itself looks very special with it´s Chinerunner concept. Sven decided to use this technique instead of an conventional keel, as he have become inspired of the American small boat designer Matt Layden. For Me, the rudder construction looks most impressive. A huge rudder almost reaching the ceiling in his workshop, now pointing 180 degrees from it´s normal position. Sven explain - the rudder is a part of the lateral plane and need to be that size. And I also like to be able to steer the boat and have good control when she´s running the heavy waves in the South Atlantic. When some of his birthday congratulators realized that he was going to ride such a big waves with this little tiny boat, they get shocked. But Sven assured - no problems, a small boat like this is more secure then a big one.

So when the two hours audience was over We got a clear view over the project, both the philosophy behind and how Sven is constructing and building the boat. And I would like to say - So far so good - with Sven and his new boat.

THE CHINERUNNERS: MATT SPEAKS

2009-05-03T12:30:00.001-07:00

Matt with Enigma on the long Watertribe race around Florida, which he was leading most of the time. The chinerunners are clearly visible, the wheels are attached to them.

Hera is a copy of the Small Craft Advisor interview with Matt about the chinerunners. It is good reading. My copying is less good. You have to zoom or click once or twice on the different pictures to make the size of the text big enough to be readable, but its worth the trubble. Enjoy.

RUDDER

2009-04-20T11:13:00.000-07:00

I like to have a big rudder to help prevent leeway. I also like to have it far back when surfing down the big waves in the roaring forties and screaming fifties. The when getting inshore I like to reduce my draft to and to be able to pull the boat up the beach. Finally the rudder is going to steer the boat while I sleep. I dont like selfsteering devices as the are complicated. I have good experiences with sheet to tiller system and also to get the boat to steer itself by its own balance. With sheet to tiller system a sheet is connected to the tiller to give feedback. In my design I do not have a tiller instead stearing lines are directly connected to hornlike extensions on the rudder and rudderblade as the below pictures will show. A threaded rod keeps them together. It is however very important that the rod is perpendicular to the surfaces wich must be very flat. This is how I have done it:
I covered a glass plate with teflon.

Click on the pictures to make them bigger

This is the surface of the rudderhead I vanted to be flat

I mix NM-epoxy with filler

I spread the mixture on the rudderhead

I put the rudderhead on the tefloncovered glassplate. I put on a lot of leadweights to squise out the mixture. After the rudderhead I repeated it on the rudderblade.

I made a 300 millimeter long 30 mm diameter drillbit and drilled a whole as perpendicular I could.

I had made a carbonfiber pipe to put inside the oversize hole. I closed the bottom part of the pipe with butylrubber.

I had made a guide by welding a rod to steelplate and turning the plate in a lathe thus assuring a 90 degree angle. I turned the rudderhead 180 degrees. I put in the rod of the guide in the pipe thus making being 90 degrees to the surface. What you see in the picture below is rod coming up inside the carbonpipe. In the space between it and the oversize hole I poor epoxy to fix it.

Everything worked out. Here is the rudder in the upplifted position. Thanks to the possibility to tilt up the rudder 180 degrees it does not stick out behind the boat were it can be damaged in port.

Here is the rudder in the down position.

Here is the tackle I will steer with.