MONSUN 31

About the MONSUN 31

Also sold as RASMUS 31.

Designed by Olle Enderlein and built by Hallberg-Rassy, the Monsun 31 is a robust coastal cruiser with 904 hulls produced between 1974 and 1982. Its heavy displacement and full keel design prioritize stability and comfort over raw speed, making it a classic example of Scandinavian build quality from the late 1970s.

Best for:

This boat is ideally suited for coastal cruisers and those seeking a comfortable, stable passage-maker who prioritize interior volume and solid construction over high-performance sailing metrics. It appeals to owners who value the Hallberg-Rassy reputation for durability and are willing to maintain older systems.

Bluewater capability:

With a displacement of 9250.0 lb and a capsize ratio of 1.8, the Monsun 31 is well-suited for offshore passages, offering excellent stability and a forgiving motion in heavy seas thanks to its full/long keel and high D/L ratio of 275.03.

Comparables:

Comparable boats include the Hallberg-Rassy 31 and other Enderlein-designed vessels from the same era, such as the Hallberg-Rassy 35, due to their shared design philosophy of heavy displacement and full keels. It also competes with similarly sized heavy-displacement cruisers like the Tartan 31 or O'Day 32, though the Monsun offers a more refined interior layout typical of its builder.