Mamba 311 Information, Review, Specs

History and Design

The Mamba 311 entered production in 1983 and continued until 1986. It emerged as an updated iteration of the Mamba 31, a design that had been introduced in 1979. Designed by Bengt Karlsson, the Mamba 311 reflects the builder's overarching philosophy of crafting stable and capable fiberglass sailing vessels. During this period, Mamba Boats, like many Scandinavian builders, focused on durable fiberglass construction, influenced by the International Offshore Rule (IOR) which shaped many performance-oriented cruisers. The company aimed to produce "light sailboats" that were "reasonably good performers" while maintaining high levels of stability. A key feature of the Mamba 311's production was its availability with either a masthead or a fractional rig, offering owners flexibility in sail plan depending on their sailing preferences. While a masthead rig typically provides more raw power from a larger genoa, a fractional rig allows for finer control over sail shape, particularly beneficial for racing and optimizing performance in varying wind conditions.

Sailing Performance and Handling

The Mamba 311's design specifications translate into a capable and responsive sailing experience. With a Sail Area to Displacement Ratio of approximately 15.5, the Mamba 311 is characterized as a moderately powered sailboat. This suggests a design focused on comfortable cruising and solid performance, rather than an extreme light-air racer. Her Ballast to Displacement Ratio, standing at approximately 0.457, indicates a stiff and stable boat that can stand up well to a breeze and provide a comfortable motion when sailing through a seaway. Furthermore, a Displacement to Length Ratio of around 190.5 hints at a relatively lighter, more performance-oriented vessel for its size, suggesting respectable speeds for a cruiser. Owners have consistently described the Mamba 311 as a "stable and safe boat," indicating confidence in its sea-keeping abilities. Equipped with a fin keel and a spade rudder, the Mamba 311 is generally responsive and agile, contributing to a positive handling experience under sail.

Accommodations and Layout

While specific headroom figures are not consistently documented, the Mamba 311's interior is designed to maximize comfort and utility within its 30-foot length. Typical of a cruiser from the 1980s, the layout likely includes a forward V-berth, a main salon featuring settees that often convert into additional berths, and a functional galley. Some configurations are known to feature an L-shaped galley, optimizing space for meal preparation. Storage solutions would have been integrated throughout the cabin to accommodate cruising essentials. The general finish quality, characteristic of Swedish builders of the era, would likely involve practical use of materials, offering a balance of durability and a comfortable aesthetic.

Owner's Perspectives

Owners of Mamba 311s frequently highlight the enduring build quality and solid sailing characteristics inherent in these Swedish-built yachts. The Mamba 311 is often praised for being a "stable and safe boat," capable of handling both leisurely cruises and more spirited Wednesday evening races. The sturdy construction, a hallmark of Mamba Boats, contributes to the longevity of these vessels on the used boat market, particularly in Northern Europe. While specific widespread issues are not commonly cited, owners undertaking refits often consider upgrading sails and various lines as part of routine maintenance. Like many boats of its vintage, the Yanmar diesel engine, while generally reliable, can sometimes present starting issues, often attributed to electrical wiring concerns. Overall, the Mamba 311 is regarded as a dependable and well-performing cruiser that continues to provide satisfaction to its owners decades after its initial launch.