Sigma 18 is a 17′ 5″ / 5.3 m sailboat designed by Brian Amato and built by Sigma Sailcraft Co.(USA) between 1979 and 1980.
Originally the TANGERINE 18. Relatively few built as SIGMA 18. The molds were purchased by Renkin, primarily, a builder of powerboats, where it became the RENKIN 18.
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