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Tag Archives: bulb

Bulbs

Sunday, November 7, 2010

Some IOM bulbs from the new moulds.

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New IOM bulb moulds cnc-machined

Monday, October 25, 2010

Jari made these new IOM bulb-moulds over the weekend. CNC-milled in aluminium. Circular cross-section with a NACA0010-34 profile (similar to my 2005 design), length ca 360mm. Designed with a central stiffening brass rod. Check out rcyachttech.webs.com for more cnc-machined moulds and parts. See also casting notes from 2003.

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CNC-turned stainless steel IOM bulb

Monday, May 3, 2010

CNC-turned from stainless steel, this is a 400mm long and 38mm diameter IOM keel bulb. A slot will be milled in the middle for the keel fin. Unlike a lead-bulb this one will require no surface filler/sanding/painting. But the density (compared to water) of stainless steel is 8 at most, while lead bulbs can be [...]

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Bulb Milling Videos

Thursday, May 22, 2008

Jari shot some videos during the milling of the beaver-tail bulb. They now appear on YouTube. For a mostly home-built cnc minimill of this size, this is pretty 'hard core' stuff...

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Steel bulb nr3

Monday, May 19, 2008

Jari made this steel bulb over the weekend. It has a slightly triangular cross section in the beginning which flattens out to a 'beaver-tail' at the end.

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Bulbs of Steel

Saturday, May 10, 2008

As a first serious test-run for our now servo-controlled cnc mill we decided to make an IOM bulb out of steel. It ends up a bit bigger in volume when made out of steel compared to lead, but the difference isn't huge. Making it with a cnc mill allows designing almost any reasonable 3D shape [...]

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