Hello Steve,
The Rhythm article was published over the October and November 1993 issues of Boats.
The October issue carried half of the main yacht drawing pus the rig drawing and six pages of text.
The November issue contained the other half of the yacht plus the sail drawing with four pages of text.
Rhythm is still listed in the Plans Service, available from Sarik Hobbies.
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Magzines currently listed on Ebay:
**LINK**
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You may find cheaper examples but bear in mind that secondhand magazines often have the free plans removed.
Hope this helps.
Colin