In 1974, the esteemed Swedish boatbuilder Hallberg-Rassy launched the Monsun 31, a part of their highly praised line of cruising sailboats. The vessel was designed by the distinguished naval architect Olle Enderlein, who had previously contributed his expertise to several other successful Hallberg-Rassy models, such as the HR 35 Rasmus and the HR 42 E.
The Monsun 31 was meticulously crafted as a classic cruising sailboat. They featured a full keel, elongated overhangs, and a substantial displacement, which ensured stability in turbulent waters. Boasting a length overall (LOA) of 31 feet (9.45 meters), a beam of 9.5 feet (2.9 meters), and a draft of 4.6 feet (1.4 meters), the boat is ideally suited for extended offshore voyages. Its design incorporates a low freeboard, reducing wind resistance and enhancing stability. This and the extended waterline contribute to better performance and speed. The boat’s seaworthiness and reliability made it popular among sailors who valued comfort, safety, and traditional design.
The Monsun’s rig is designed with simplicity in mind. It features a single spreader and a furling genoa, which allows for effortless handling by a small crew. The sail area is moderate, which helps to maintain stability in forceful winds. But it’s still large enough to deliver satisfactory performance in lighter breezes.
The Monsun 31’s construction adheres to high standards, employing top-notch materials and skilled craftsmanship. Its solid fiberglass hull is hand-laid and reinforced with woven roving, ensuring its strength and durability. Similarly, the deck consists of fiberglass with a balsa core, offering both rigidity and insulation. Additionally, the boat is equipped with premium hardware and fittings, including bronze winches, stainless steel stanchions and pulpits, and teak handrails. All of these factors further attest to its quality and reliability.
The interior is spacious and comfortable. With its two-cabin layout, up to six people can be accommodated. The saloon is located amidships. It features a large table and comfortable seating, making it an ideal place to relax or dine. The boat’s galley is located on the port side. It’s well-equipped, with a stove, oven, sink, and refrigeration. The head is located between the front cabin and the saloon. In some versions, the head is located on the starboard side.
During its production run from 1974 to 1982, 904 Hallberg Rassy Monsun 31s were built. The boat quickly gained a reputation as a seaworthy and reliable cruiser. Many of the owners have taken their Monsuns on longer voyages. The Monsun has sailed worldwide and completed numerous ocean crossings. For many cruisers who value comfort, safety, and traditional design. it has become a favorite.
In the years since the Monsun 31 was first introduced, it has become a classic cruising sailboat with a loyal following of owners who appreciate its timeless design and solid construction. Many Monsun 31s remain in active use today, and the boat continues to be popular among cruisers who want a reliable, comfortable, and seaworthy vessel for exploring the world’s oceans. The Hallberg Rassy Monsun 31’s enduring popularity is a testament to its quality and the enduring appeal of traditional cruising sailboats.
Hallberg-Rassy Monsun 31 Data
| Designer | Olle Enderlein, Sweden |
| Hull length | 9.36m / 30′ 9″ |
| Waterline at rest | 7.5 m / 24′ 8″ |
| Beam | 2.87 m / 9′ 5″ |
| Draught, empty boat | 1.40 m / 4′ 7″ |
| Displacement | 4.2 tons / 9 250 lbs |
| Keel weight | 1.9 tons / 4 2000 lbs |
| Keel type | Molded in steel keel in deep GRP bilge pocket |
| Sail area with jib | 39 m2 / 430 sq ft |
| Engine (original) | Volvo Penta MD 11 C |
| Power | 17 kW / 23 HP |
| Engine (Luna) | Yanmar 3YM30AE |
| Power | 21.3 kW / 29.1 mhp |
| Diesel tank | 120 l / 32 US gallon |
| Fresh water tank | 160 l / 43 US gallon |
Documents
| Color brochure 2 MB | |
| Standard Specification 2 MB | |
| Owner’s manual, English 14 MB | |
| Owner’s manual, German 1 MB | |
| Owner’s manual, Swedish 3 MB | |
| Range brochure from 1973 3 MB |
Useful links
Official Monsun 31 page
Hallberg-Rassy Webshop
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