Laerke IOM by Søren Andresen

drawing in DXF format

Søren Andresen (DEN) sent me the plans for his own design with which he won the 2005 Nordic Championship and placed 2nd in 2004. He also sailed it into 35. place in the 2004 Euro Champs in Arcos/Spain.

The PDF file contains the sections and a drawing with the mast and keel positions but you should really download the DXF file and printout accurate sections with a CAD program if you want to build the boat.

Continue reading Laerke IOM by Søren Andresen

Arm winch sheeting arrangement


Søren Andresen (DEN) uses this interesting arm winch setup on his boat.

The idea is that by attaching the jib and mainsheet at different points wrt. the block on the arm you can get unequal travel on the sheets. As shown here the mainsail can be adjusted virtually independently of the jib sheet when close hauled.

A number of people were interested in it at the Euros in Arcos so Søren has made a detailed drawing and kindly allowed me to publish it

2004 IOM Nordic Championships, Risör, Norway


The first Nordic IOM Championships were held in the small town of Risör, ca a 2 h drive southwest from Oslo, Norway, during the weekend of 21-22 August 2004. 25 boats(3 FIN, 2 DEN and 20 NOR) in two heats using HMS completed 13 races during two days. The wind was variable in strength and very shifty on both days. Mostly no1 rig with the no2 rigs being used for a couple of races on Saturday.
Continue reading 2004 IOM Nordic Championships, Risör, Norway

IOM mainsail geomtery


Getting the leech points correct when building a mainsail can be quite challenging.
Thomas Dreyer(GER) emailed me with this drawing+text about how to get the geometry correct when you are building an IOM (or M) mainsail.

Lester Gilbert has a similar kind of drawing at his site: "Measuring an IOM Mainsail"

Text is currently only on German, if anyone more fluent than me in German wants to send in an English translation then that would be great ! (Or someone who is good at programming could make a program that calculates the shape...)

IOM Bulb Mould plans

Update 2015-03-01: by popular demand, IGES files for the top and bottom bulb mould. Use at your own risk.

  • bulb Dated 2003-05-01. If you don't have a CAD program that opens these, you can use an online IGES viewer to view the files.

Our bulb moulds are CNC milled from aluminium and more than 15 bulbs have been made successfully from them.

Note that it could be useful to make the hole through which lead is poured in a little larger than shown on the plan.
Continue reading IOM Bulb Mould plans

2003 IOM Worlds Pictures (Vancouver, Canada)

Click images for high-resolution jpegs.



Royal Vancouver Yacht Club hosted the 2003 IOM World Championships.



A view of the marina. We sailed outside the high breakwater in the background.



Practice sailing on day 1 with downtown Vancouver in the background. Notice how tiny the IOMs look with a small ring when viewed from the breakwater!



The Discos sported an aft deck patch to prevent the 'NZL-effect'



The event sponsor had some nice cars on display parked just outside the yacht club!



Slim-chance, a UK design I had not seen before.



The measurement tank, with vertical bars for checking LOA, and horizontal bars for checking overall depth and hull depth.



During sailing we could store our boats in a tent on a pontoon at the end of the breakwater.



Craig Smith's TS-2.



The courseboard described the course and what heat was currently sailing.



At big events a heat-board like this is mandatory - it allows competitors and organizers to check in which heat a skipper is sailing.



Some judges. Note the 'umpire-red' glove! On the water judging worked really well at this event - partly I think due to the great visibility from the breakwater: both competitors and judges always had a clear view of what was going on. So more elevated control areas for international events please!



Sailors on the breakwater.



A view from inside the boat-storage tent.



All of the A-heat boats heading for the downwind gate...



and here we see the leaders have already rounded.



This was the event where the arm-winch made its breakthrough. Here's a view from one side of the Isis...



and here's the other side. This is Trevor Binks' boat, he won the event.







A local sea-creature.

See also:

Mt Shasta and Lassen Park

Visiting the northern parts of California by car with a friend we stopped to look at Mount Shasta and drive through Lassen Park.


Mount Shasta, the second highest peak in California outside Sierra Nevada, 4322 m high. Last erupted around 200 years ago with a high probability of erupting again...


Another view of the peak hidden in clouds.


A landscape not so different from Finland ?


Wondering at the amount of snow (in June !) in Lassen Park. The road through the park had opened the same week. This was unfortunately a trip on which I learned the hard way about battery management for digital cameras. The batteries to my real camera (a 4 Mpix Minolta S404) died very early on and so all I have from the rest of the trip is taken with the then novel phone camera (like this pic), with not so satisfying results...