Rasmus 31 (Hallberg-Rassy 31 Monsun)
Description
The Rasmus 31 is a Swedish mid-sized cruising sailboat designed by legendary naval architect Olle Enderlein and constructed by Hallberg-Rassy beginning in 1973. This 31-foot vessel represents the spiritual successor to the pioneering Rasmus 35, often referred to by enthusiasts as the "little Rasmus" due to its shared DNA and transitional period of the yard's merger. Built with solid fiberglass construction featuring a fin keel configuration and masthead sloop rig, the boat was designed specifically for serious cruising applications where stability and seaworthiness were prioritized over racing performance. The Rasmus 31 (also known as the Hallberg-Rassy 31 Monsun) stands as a monumental pillar in the history of Scandinavian boatbuilding, representing the most commercially successful model ever produced by the Swedish shipyard, with a total of 904 hulls launched between 1974 and 1982. The design embodies the classic "Orust style" of yacht construction, where longevity and safety take precedence over contemporary racing metrics, making it a definitive example of traditional Scandinavian cruising yacht philosophy.
Construction Details
| Designer | Olle Enderlein |
|---|---|
| Builder | Hallberg-Rassy Varv AB |
| Length | 31.000 ft |
| LOA | 31.000 ft |
| LWL | 24.750 ft |
| Beam | 10.000 ft |
| Displacement | 9500 lb |
| Ballast | 3500 lb |
| Max Draft | 4.400 ft |
| Year Built | 1973 |
The standard boat dimensions
| i | 37.80 ft |
|---|---|
| j | 11.90 ft |
| p | 32.80 ft |
| e | 11.50 ft |
| p2 | - |
| e2 | - |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 37.80 ft | 11.90 ft | 32.80 ft | 11.50 ft | - | - | - | - |
Sails
Rasmus 31 (Hallberg-Rassy 31 Monsun) - MAINSAIL
| Luff | * 32.8 ft - (9997 mm) |
|---|---|
| Foot | * 11.5 ft - (3505 mm) |
| Leech | * 34.25 ft - (10439 mm) |
| Tack Angle | * 88 ° |
| Diagonal | * 34.38 ft - (10479 mm) |
| Head (inches) | * 4.5 in - (114 mm) |
| Area | * 194.56 ft² |
| Edit in Calculator |
Rasmus 31 (Hallberg-Rassy 31 Monsun) - JIBSAIL
| Luff | * 31.7 ft - (9662 mm) |
|---|---|
| Foot | * 15.72 ft - (4791 mm) |
| Leech | * 27.61 ft - (8416 mm) |
| Percentage LP | * 115 % |
| Length Perpendicular | * 13.69 ft - (4173 mm) |
| Deck Angle | * 12 ° |
| Area | * 217.01 ft² |
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Rasmus 31 (Hallberg-Rassy 31 Monsun) - GENOA
| Luff | * 37.65 ft - (11476 mm) |
|---|---|
| Foot | * 19.18 ft - (5846 mm) |
| Leech | * 35.45 ft - (10805 mm) |
| Percentage LP | * 150 % |
| Length Perpendicular | * 17.85 ft - (5441 mm) |
| Deck Angle | * 4 ° |
| Area | * 336 ft² |
| Edit in Calculator |
Rasmus 31 (Hallberg-Rassy 31 Monsun) - ASYMMETRICAL
| Luff | * 37.65 ft - (11476 mm) |
|---|---|
| Foot | * 19.64 ft - (5986 mm) |
| Leech | * 34.64 ft - (10558 mm) |
| Perc LP | * 165 % |
| Area | * 554.58 ft² |
| Edit in Calculator |
Disclaimer. Boats are not all the same -- even when produced in the same factory of the same model. Sailrite does its best to publish accurate dimensions, but we often find it worthwhile to have our customers measure their boats carefully before we produce kits for them. You should take the same precautions, especially when the data is not from Sailrite. The information on this site is not guaranteed to be accurate. Sailrite offers this content as a service to our community, but takes no responsibility for the reliability of the data provided.
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