Monday, December 17, 2012


The engine mount plate received a pretty heavy carbon laminate each side and cures under vacuum. The oblique support is laminated with a layer of uni under a piece of carbon sleeve.

I started working on a ladder (leider?) for the cabin.

I had to fit cockpit pushpits in order to comply with ISAF racing regulations.  Guess I never posted any pictures of them.  Goes from aft beam to traveller.  They actually made the cockpit even cosier, as well have they proven their benefit by keeping crew on board during inspiring conditions. Sitting on the lee side on top of aft cabin is the position of choice for the spinnaker trimmer.  Only downside is conflict with the long tiller extensions.  However, these are not allowed for racing either, as long as I do not have lifelines in a 3 meter radius around the steering position.

Wednesday, December 12, 2012

More bow work

After the bow line was established, it was possible to see how far aft the hull had to be filled out in order to get a smooth transition.  A sheet of 10mm Divinycell H60 was glued to a well sanded hull side.

This sheet of foam had to be sanded flush with the hull aft, and then towards the bow line.

Then I had to fill up with another layer of foam to the central elongated part

Then I had to fit another 6mm sheet on the forward edge of the hull fill out.  And also another 6mm along the keel being kept in place with some tape.

Finally the shaping is done.

Today I filled the perimeters of the trough hull towing and bob stay eyes with high density epoxy putty.  A 20mm PVC tube is keeping the holes open.  Also a few defects between foam pieces have been filled with light epoxy filler.

The structural part of these eyes are the existing eyes.  The holes will get a bell mouth to accept lashings and soft shackles.  Then it's time for laminating.

Also working on the float bows.  This picture showing three stages of sacrificial foam float bows; retired, shape being worked on and unprocessed 75mm central foam blank.  Divinycell H60 foam.

Friday, December 07, 2012

Rudder hum. Trailering advice.

It was a comment on my video about rudder hum.

Although Farriers are very well designed and strong vessels, I strongly recommend to withdraw the rudder before pulling your trailer out of the water, especially if you use a concrete ramp.  This is why I know:

I only had the time for a quick structural fix and the sub optimal finish enhanced the hum, although some was there before, despite all my effort to make the foil perfect

Bow mod

As the float bows will be rebuilt, the main bow should also be modified to match.

"Laminating" three sheets of 10mm Divinycell to make the backbone of the bow extension.  Using PU glue and pressure.

I don't want to make more work than necessary out of this, so the bobstay and trailer eyes will not be modified.  But as they are being covered by the extension as shown here trial fitting the extension

I had to make holes in the foam extension and will take the necessary precautions around these holes.  The blank is epoxied on and curing.  Will start the coarse shaping next time.  I will have to fill a bit to make it blend in as well, but I will not actively try to add volume here.  I do get a 12 cm added waterline though.

I've started sanding the central 30mm thick foam extension.  I will use an approximately 5mm radius at the lower part, slightly increasing up.  I will have to fill out the existing hull about a foot back, mostly at the lower part of the hull, to make the new lines fully blend with the existing hull.

To be continued ...

Engine mount

I originally installed a mechanic engine mount, the idea was to be able to move the weight a bit forward in engine up position.  I then had to rebuild it a bit for it to work, which added a bit of weight to it.  It still had a few nuisances with regards to handling so I decided it was time for retirement.

I'm currently working on a fixed mount.  This will be a Divinycell HD foam cored mount that will leave the engine at the very stern but be a few kg lighter than the other.

To be continued...

Late update on interior development. Poor pictures

I guess I got so busy sailing last spring that I did not follow up on my interior work.

Mainsail pre feeder

One of the draw backs of the boomless mainsail is that it is very difficult to raise single handed.  I put the rolled sail on the wing net, and the halyard is led to the cockpit.  It is almost necessary to have a person at the mast to maker sure the boltrope feeds properly.  So I'm looking at a technical solution to this particular crew need.

I'm currently working on a prototype carbon fibre pre feeder that will support the bolt rope over a few cm just below the slot.

Routing a mould in a piece of MDF

After sanding and covering the MDF with packaging tape, I put the carbon, foam and vacuum consumables in.

Waiting for demould until fully cured

The piece out of the mould

Cut in two pieces, one each side of the mast.  Digging out end foam.

Filling with HD epoxy putty.

To be continued....

Floats in storage. Main hull inside.

While waiting for some models showing the effect of the rebuild of the floats, the material to do it, and maybe getting hold of the money needed to buy Ian's banana foils, the floats was put in storage to give room for the main hull.

This was moved inside on the special built wagon by the help from some good friends.

This was in time as the hull was getting gradually filled by rain water because of a few leaks, and the temperature fell well below freezing just after the hull was safe inside on November 27th.

Tuesday, November 27, 2012

Jacta est alea

Supposedly said by Julius Caesar on January 10, 49 BC when he crossed the river Rubicon to start the war against Pompeius. Today repeated by yours sincerely as I cut the bow off Panta Rei's starboard float.

The bow bulkhead's position was established by palpatory percussion and measurement from the beam bulkhead.  Then I drilled holes safely forward of the bulkhead to establish it's exact location.

Then I drew a line and cut the float in halves.  OUCH!

Showing current and suggested new surface contour at this location

Starting to build up a new foam blank for the elongated plumb bow.  Old and new, side by side

I've calculated the added volume from bow bulkhead to beam bulkhead to be approximately 26 litres.  I have to look closer at the difference between the two foam caps, but the added length alone should give more than 10 litres.

Saturday, November 24, 2012

Main sheet mods

I had the recommended 6:1/24:1 main sheet.  I used the Ronstan system main sheet #12. I've used a 10mm triple braid for coarse and 8mm for fine.  My focus at the time of purchase was grip and the hand of the line.  There is a lot of friction in the lines and I will change to thinner lines for that reason, at least the coarse.

I would wish for a bit more power on the coarse.  The fine has plenty of power, but very little travel.

Today I added a block to get 7:1 coarse, left the fine so 28:1 fine.  Usual crossing lines as the triples make.  I had a 50 kg load that was not able to let the line out because of friction.

After studying this set up for a while I got an idea and threaded it again. Voila! The twist was gone. No scientific results, but it felt lighter.  I also went down to 3:1 for the fine.  Will have to replace the 40 double with a single with becket. And a thinner line and I guess I'll be there.  7:1/21:1 it is now.