The Sigma 33 sailboat was designed by British naval architect David Thomas and built by Marine Projects at the company's premises in Plymouth, England. Known for its performance and reliability, the Sigma 33 has earned a good reputation within the sailing community since its introduction.
There were two versions of the Sigma 33:
Keel & Rudder Configuration: Fin keel with a spade rudder
Hull Material: Fiberglass (GRP)
Length Overall (LOA): 9.8m (32'2")
Waterline Length (LWL): 7.7m (25'3")
Beam: 3.2m (10'6")
Draft: 1.75m (5'9")
Rig Type: Masthead sloop
Displacement: 4,150kg (9,150lb)
Ballast: 1,905kg (4,200lb)
Designer: David Thomas
Builder: Marine Projects (Plymouth) Ltd.
Year First Built: 1979
Year Last Built: 1991
Number Built: Approximately 390
*Limitations of Ballast/Displacement Ratio: This ratio provides a general idea of a boat's stability and ability to stand up to wind, but it does not consider the distribution of the ballast. The same amount of ballast located lower in the keel (e.g., in a bulb) results in greater stability and stiffness compared to ballast distributed higher up. Understanding the exact configuration of the ballast is crucial for a complete assessment of a boat's stability.
**Comfort Ratio Considerations: Ted Brewer's Comfort Ratio tends to favor heavy displacement, narrow-beamed vessels with long overhangs, which may not accurately reflect the comfort of modern light-displacement, beamy cruisers with plumb bows. These modern designs might still provide good crew comfort and bluewater capability but score lower on the Comfort Ratio simply due to their design differences. Therefore, while the Comfort Ratio offers useful insights, it might not fully represent the comfort levels of contemporary yacht designs.
In summary, the Sigma 33 sailboat appears to be a well-balanced cruiser with good performance, reasonable stability, moderate motion comfort, and moderate suitability for bluewater passages. However, the theoretical nature of these ratios means that practical performance can vary, especially considering factors like ballast placement and modern design features that are not fully captured by traditional design ratios.
Here's how to calculate the KPIs yourself - without having to wrestle with the mathematics...
Sailing Today says: "Jake Frith took a 1982 one design cruiser racer for a dash around the central Solent. Would this racing thoroughbred prove too flighty for cruising duties?" Read more...
Yachting Monthly tells us: "One of the most successful offshore one-designs ever launched, the Sigma 33 is also becoming widely recognised as a capable and versatile cruising yacht." Read more...
This article was written with the assistance of Gemini, a large language model developed by Google. Gemini was used to gather information, summarize research findings, and provide suggestions for the content and structure of the article.
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