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

IOM Sail Measurements

Update 2015-03-01: some source-files for this drawing:

  • rigs1_2_3.ai, dated 2001-12-30. Adobe Illustrator format. Inkscape seems to open this - tested on Ubuntu 14.04LTS.
  • rigs123_individual Individual files with rigs 1, 2, 3. Adobe Illustrator.
  • rigs123_freehand dated 1999-05-XX. Freehand (Mac OS 9 version). Let me know if some modern free program opens these!

See also update from 2004: IOM Mainsail geometry.

 


The various sail measurements from the IOM class rule illustrated in a drawing. Prints all three rigs on one A4 paper.

IOM Rig comparison


A diagram showing the measurements needed when building a set of IOM rigs. The table shows measurements taken from rigging guides and plans by world champions in the class: Craig Smith (New Zealand 1997), Graham Bantock (France 1994 and Malta 1999) and Martin Roberts (Croatia 2001).