Ninja, a Marblehead by Henry Ericsson

A building guide for the "Ninja" Marblehead in 4 parts by Henry "Heffe" Ericcson. Published in Pienoismalli in 1988.

During the 80-ies it was still possbile to home-build a competitive Marblehead. The article describes the planking process, radio installation and rig building. An unknown number of these were built and raced in the 1990-ies, the most visible ones being two beautifully planked wooden Ninja's by the Purhonen brothers.

A nice example of how an article series can have a positive effect on the class in a country. A comprehensive guide starting from scratch building the hull and ending with tuning the boat and racing rules/tactics. We definitely need something similar for the IOM class ! (something along these lines is where I want to take the Noux concept - if and when I have time...)

This series later also appeared in the Swedish Allt om Hobby magazine. (If anyone has that article series I could publish it here also!)

Click the upper picture to download the article series (4 Mb)

The lower picture is a link to the plan (1 Mb)

Vimppeli, a Finnish model yacht from 1953

I've started a new 'Articles' section which will feature articles that I've collected. I expect they will be mostly radio sailing related, some in english, some in finnish or swedish.

This article, a piece of Finnish model yachting history published in a magazine called Joka Poika in 1953, is a plan and a building guide for a vane steered model yacht. At the end of the article an upcoming finnish championship with more than 20 of these boats taking part is described !

Thanks to Risto Tomminen for sending me this article. Risto had one of these boats and took part in the finnish championship in 1955.

Click the picture to download the pdf file (3 Mb).

Temp controller for curing box

Curing epoxy mouldings typically requires elevated temperatures (+ 40 to 70 C) for 4-12 h. Previously we have done this in a cardboard box with a car-heater continuously blowing hot air into the box. By adjusting the number and size of holes in the box the temperature can be crudely varied.

Here's an attempt to create a better heater with temperature control.

Temperature controller with display and input buttons on the left. White temperature sensor in the middle. 200 W heater-blower box on the right.
Continue reading Temp controller for curing box

Helsinki Regatta 2006

Some pictures from the 2006 Helsinki regatta. I was in the boat responsible for the top marks, but we got a few pictures of the start also by the end of the day.

click the pictures for full-screen versions.












First Steps With Brushless Servodrive (Microchip dsPIC + IRF IRAMS)

Today I got the whole motion control chain from EMC2 on the pc through the Mesa m5i20 servo-card, homemade optoisolator card (far right), PWM to analog filter (small board on the right), servodrive (middle), powerstage (middle left, with heatsink), through to the motor (left, a Sanyo P5 1kW servo) working !

This is truly Open Source cnc: EMC is obviously an OpenSource project, but also the FPGA configuration on the m5i20 is published under the GPL, and my servodrive code will be available when it fully works.

The picture might seem messy with a whole lot of wires - but I can assure you that it's all very organized... 🙂

Continue reading First Steps With Brushless Servodrive (Microchip dsPIC + IRF IRAMS)