IOM Sail Measurements

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

  •, 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).